Archive for the ‘Jacaranda’ Tag



Day by day the rains lessen.  Day by day the sun is breaking through a little more, warming up the ground and consequently the air.  Evaporation causes the relative humidity to rise.  We are almost there, almost into the dry season.  It won’t be long before we start to lament the lack of precipitation but let us at least enjoy the first few dry weeks without complaint.  There were five days with almost no rain but it was a false start to the dry season, the rain returned, not heavily, but rather  grey days with drizzle.

Coloring Time

The increasing temperatures and decreasing precipitation seem to have stimulated flowering in at least some of the plants.  There is one small bush that has produced a display of flowers.  It has the captivating name of Yesterday, Today and Tomorrow, (Brunfelsia grandiflora).  The name refers to the rapid color change in the flowers.  When the bud bursts and the new flower blooms, it is a light lilac color.  By the following day the hue will have started to fade and then several days later the now white flower falls from the bush.

Yesterday, Today and Tomorrow Purple flower.

Yesterday, Today, Tomorrow, (Brunfelsia grandifolia). Flower

Yesterday, Today and Tomorrow is native to the northern part of South America.  It belongs in the nightshade family; Solanaceae.  It is planted in many Costa Rican gardens to provide a showy display of changing colors.  The flowers are also fragrant and attract bees.

Color Sensitive

Many people are familiar with the Sensitive Plant, (Mimosa pudica).  It has the entertaining habit of closing its leaves on contact or as night falls.  It is a very low growing plant found sprawling along the edges of paths and roads.  It is a native to Costa Rica but has now been naturalized in many tropical areas around the world.

The short-lived flowers are a deep lilac fused with red and are pollinated by bees.  But the most intriguing thing about the Sensitive Plant is the ability of the leaves to fold up.  At night the plant exhibits a behavior known as nyctinastic movement.  As the sun sets are darkness envelopes the forest, the leaves of the Sensitive Plant fold and close together.  As the sun rises, they open up again.

Flower of Sensitive Plant, (Mimosa pudica)

Sensitive Plant, (Mimosa pudica). Flower

But more familiarly, if touched the leaves immediately close, a phenomenon known as seisonastic movement.  The means by which this happens is fascinating.  Contact with the leaf causes an electronic impulse to be passed along the leaf which in turn stimulates the transfer of potassium out of the cells at the base of the leaf which then lose water and become flaccid and collapse.  This is an energy expensive reaction from the plant to external contact and therefore must convey some benefit.  As of now, we are not entirely sure what this benefit is.  It could well be that it makes the leaf less appealing to herbivores or when it rains reduces potential damage by being smashed against the ground.  Whatever the reason it certainly compels people to tap it and watch the response.

The Sensitive Plant is also an important nitrogen fixer.  It releases a compound from its roots that inhibit certain pathogenic fungi growing near its roots.  The roots have nodules which contain nitrogen fixing bacteria.  The bacteria do something the plant cannot, they take atmospheric nitrogen and convert it into a form usable by the plant.  Plants require nitrogen for many aspects of their lives, not the least of which being the growth of tissue.  Up to 60% of the Sensitive Plant’s nitrogen requirement is provided by the root-dwelling bacteria which allow it to thrive in areas where the soils are nitrogen deficient.

Purple Rain: Lavender and Lilac Light Up The Forest

There are several other small herbaceous plants that can be seen on the forest floor or around the gardens that have lavender or purple coloration.  Here and there an isolated small purple bell-shaped flower can be found.  The small bloom stands out in contrast to the deep green of the surrounding vegetation.  This is Monopyle sp of the family: Gesneriaceae.  Growing in the same localities but with a larger, shrubbier aspect is the Portaweed, (Staphytarpheta frantzii), which is in the family: Verbenaceae.  The butterflies, particularly skippers, seem to be attracted to the Portaweed flowers.  Both of these plants are native to Costa Rica.

Flower of Monopyle sp

Monopyle sp. Flower.

Portaweed, (Stachytarpheta frantzii). Flower

Portaweed, (Stachytapheta frantzii). Flower

Whereas both of the above plants are low growing and herbaceous, there is a tree that produces a spectacular display of flowers in the canopy, so much so that they are planted in Costa Rican town streets for their attractive blaze of color.  These are the Jacarandas.  When the flowers finish blooming they fall to the ground and cover the forest floor in a carpet of purple.  A native Jacaranda in the forests of the Osa Peninsula is Jacaranda copaia, family: Bignoniaceae.  When it does flower, the canopy is enriched with its pigmented presence.  Afterwards, it provides a brief but colorful change to the normally dull red mud of the forest trails.

Jacaranda, (Jacaranda copeia). Flower.

Jacaranda, (Jacaranda copeia). Flower.

Too Blue To Be True

Flowers tend to divide into 3 distinct classes with regard to color; red, orange and yellow or pink, lilac and lavender or white, cream and green.  The different colors favor different types of pollinators.  Red, orange and yellow attract birds, namely hummingbirds, pink, lilac and lavender are visited by insects, particularly bees, finally whites, creams and greens normally have nocturnal pollinators such as bats and hawkmoths.

The different colors are produced by different pigments.  Plant pigments fall into four categories.  Chlorophyll is a name most people will be familiar with, certainly to some level.  It is responsible for the vitally important green coloration of plants.  Carotenoids give rich reds, oranges and yellows.  Flavonoids give the deep red/purples as well as blacks, browns and white.  Betalains produce red/violet and orange/red.  Things are not as simple as outlined above as there are many overlapping shades and hues.

The one color noticeable by its absence is blue.  Blue is not a common color in plants or animals.  Less than 10% of the named 280,000 species of flowering plants are blue in color.  Plants that have blue flowers have done so with a little bit of manipulative trickery because there is no true blue pigment found in plants.  Anthocyanins are a flavonoid pigment responsible for many red flowers and fruits.  By mixing some of the pigments and altering the pH a blue color is produced.  This produces some spectacular blooms such as Bluebells, Delphiniums and Morning Glory.

A Burning Change   Leave a comment

Philip Davison Nature Diaries. Bosque del Cabo Rain Forest Lodge.

The dry season continues unrelentingly.  The daytime temperatures are still hitting the 100⁰F, (40⁰C), mark.  There was a fleeting downpour one lunchtime that lasted little more than an hour.  That same evening, with the momentary increase in humidity as the ground remained damp, the Halloween Land Crabs responded by emerging from their burrows in large numbers.  The following night however they were once again noticeable by their absence as whatever precipitation had fallen once again evaporated and the bone-dry situation persisted.

The gardens are visibly showing signs due the effects of the extreme heat and arid conditions.  The lawns are now more or less devoid of any greenery, all that exists is a broad area of parched brown burnt grass.  The herbaceous plants are suffering too.  Many of them have lost leaves and if they have not fallen over and died then they are most certainly looking limp and in distress.  They will have to wait for a while yet for any relief as the rains do not normally start until mid-April or May.

Buggy Surprise

Many of the creatures I photograph are found serendipitously.  I rarely go out to photograph something specific unless it is a plant or animal that I have seen while out walking that I think will remain in place until I return with the camera.  The weekly blog is written from the point of view of accidental discovery.  I never know what I am going to write about until I find it.

This week I came across two different species of bugs on the same day.  One was a Big-legged Bug of the family: Coreidae and the other was a stinkbug nymph of the family: Pentatomidae.  The term big-legged bug perfectly describes these heteropterans.  The femur of the rear legs is stout and bear spike-like projections.  The tibia is flattened.  They are herbivores and can sometimes become a pest feeding in large numbers on crops.  This individual belongs in the genus: Acanthocephala but I am not sure of the species.  There are twenty-four named species of Acanthocephala of which seven species live in Central America.

Big-legged Bug. Hemiptera. Heteroptera. Philip Davison.

Big-legged Bug, (Acanthocephala sp)

The stinkbugs are named after their ability to produce a repugnant smelling secretion from glands in the abdomen.  They are sometimes called shield bugs due to the body shape.  I found this particular species in the nymphal stage.  There were several of them living gregariously together sucking sap from the leaves of a passion vine. The stinkbugs go through five nymphal stages before becoming adults.

Stinkbug. Pentatomidae. Osa Peninsula. Costa Rica.

Stinkbug, (Family; Pentatomidae)

Flower and Fruit

The Guacima tree, (Gauzuma ulmifolia), is found growing at the forest edges here at Bosque.    It is easy to miss the flowers but the fruits are more visible.  Currently they are lying all over the ground in the areas where the trees are growing.  The fruits are very hard and are only occasionally fed upon by White=faced Monkey.  The tree is more commonly found growing along roadsides where livestock feed on the fallen fruits.


Guacima, (Guazuma ulmifolia). Fruit.

A tree that is flowering throughout the forest at the minute is the Jacaranda, (Jacaranda copaia).  The bright lilac-colored bell-shaped flowers are covering large areas of the forest floor like a violet carpet.  Jacaranda as well as Guacima are both native to Central America.


Jacaranda, (Jacaranda copaia). Flower

The Mayo Trees, (Vochysia ferruginea), have started to flower.  The crowns of the mature trees in the canopy are covered in an umbrella of bright yellow.  The Mayo Trees are so named because they supposedly flower in Mayo but that has not been my experience in the last seventeen years of living in Costa Rica.  Soon the canopy will be awash with patches of bright pastel colors like a giant watercolor painting.

Philip Davison Is a Biologist, Writer and Photographer Based in Costa Rica

Posted March 20, 2017 by felipedelbosque in Philip's Nature Diary

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A New Year’s Heat Wave   Leave a comment

Felipe del Bosque Blog January 7th 2013

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A New Year

The dry season is upon us now.  We have had very little rain over recent weeks and that we have had has amounted to little more than an occasional short light shower with intermittent heavier showers later in the evening..  The temperatures are rising and the sun is shining all day long from dawn to dusk.  The skies are blue with rarely a cloud to be seen.

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This change in the weather stimulates a change in both plant and animal behavior.  Over the next few weeks it will be possible to see a number of trees starting to flower.  Already the Monkey Comb Tree, (Apeiba tibourbou), has been flowering and the early fruits that have fallen prematurely can be seen lying on the forest floor like small lime green sea urchins.  Later they will fall as larger brown spiny balls.

The Ajo Tree or Garlic Tree, (Caryocar costaricense), is producing its first flush of bright yellow flowers.  They don’t smell as good as they look, unless of course you have a liking for Italian food.  They give off the odor of garlic, albeit not as strong.  There is very little wind present in the forest and so the trees rely on animal agents for pollination and seed dispersal.  Bats are very important pollinators and seed dispersers which is why the plants reliant on these animal agents give off strange musky smells.  That includes the Garlic Tree which uses the scent of garlic to attract in nectar feeding bats which become covered in pollen that they then transport to the flowers of other Ajo trees affecting pollination.

Ajo Flower

Another tree with a showy display of flowers has been in bloom over the past week, the Jacaranda, (Jacaranda mimosifolia).  Its crown has been adorned with a spectacular display of small purple trumpet shaped flowers but the spectacle is short lived and now it has shed most of the flowers which lie covering the ground as a lilac carpet.  Jacaranda is not a native to Costa Rica, it is originally from Argentina.  It is however now found growing all over the world where conditions are suitable because of the colorful soft pastel lilac display set off against the green of the canopy.


Sounds of the Summer

Now is the time of the mass cicada hatchings.  For 2 years the nymphal cicadas have bided their time burrowing in a mole-like fashion beneath the soil, tapping into the vascular system of plant roots and feeding on the copious sap.  They have grown in size, periodically shedding the exoskeleton before emerging and climbing up the vegetation to start the final few weeks of their lives.  To do this a profound change in the insect has to occur.

The last nymphal stage climbs up the trunk of a tree or a shrub, never very far, at the most about 6 feet or so.  You can quite often see the eerie looking hollow shells, which resemble some imaginary mediaeval beast, suspended in terminal animation, sometimes in collective groups beneath the leaves of plants,.  Down the back you will find a split in the skin where on some previous evening the adult will have swollen in size splitting the exoskeleton and then extricating itself by pulling out backwards only to emerge as a completely different looking creature.

Cicada Exoskeleton

The newly freed adult has wings that need to be pumped with fluid which flows through the veins until the clear cellophane-like material has been expanded and stretched tight.  It is now ready for flight and when ready it takes to the air making its way into the leafy canopy above.  This is the reproductive, dispersal and final stage in the life of the cicada.


The males have two sound producing organs on the abdomen each of which is called a tymbal.  They act like the skin of a drum but instead of drumsticks beating on them it is muscular action that vibrates the membranes which results in the production of sound.  The brighter the sun and the hotter the daytime temperatures the more vigorously the cicadas call and with a greater intensity.

As we move into the mid period of the dry season, ever more cicadas emerge.  At the zenith of their activity, the sound becomes intense.  The cacophony rises and falls with each passing cloud, reaching a crescendo under a clear sky.  Later in the day as the light levels falter and dim, the cicadas reciprocate with a drop in noise levels.  Eventually they stop.  This though is only a momentary blessed relief on the ears as once the sun starts to dip below the horizon a new cicada, the Sundown Cicada, starts up to serenade the last flickering rays of sunlight filtering through the forest.  Its calling is no less intense than its daytime cousins.  But once the sun takes a final bow and darkness descends, it is as if someone has hit a switch and they all stop at one and the same instant.  Now out come the crickets and katydids to carry on the insect orchestra nocturne.

The function of the calls is to attract a mate.  When a female arrives and selects her chosen suitor, they pair up, the female subsequently lays her eggs in the bark or leaf tissue where they develop and hatch.  The larvae fall to the ground and begin the life cycle anew by tapping into the tree roots once again.

Cicadas belong to the insect Order Hemiptera, Suborder Homoptera Family Cicadidae.  In the adult stage they feed on plant sap as do the nymphs.  When walking through the forest, apart from the sound, you may well find yourself being hit by one of these insect missiles as the cicadas gyroscope doesn’t seem to function too well.  One other phenomenon witnessed by people this time of the year is what seems like a constant shower of rain despite cloudless skies.  When the cicada taps into the vascular system of the plant to feed on the sap which is under high pressure, the liquid is forced through the cicada’s alimentary canal and ejected from the rear end.  The insect will have extracted the proteinaceous element of the sap and eliminates the sugary fluid which the origin of the “rain”.

Sun Worshipers

I like this time of year when we experience the transition from wet to dry as it brings out more butterflies.  With every passing day, so long as the sun continues to shine, the butterflies increase in numbers of both individuals and species.  Many of them are freshly occluded and so their colors are vivid and intense.  There is a patch of Lantana camara not far from the restaurant which is more often than not covered in briefly alighting butterflies of many shapes and color, all taking a quick sip of nectar before moving off to the next bloom.  The yellow and orange blooms must be continually producing nectar as the butterflies flit around, one after the other visiting the same flower head.

Chlosyne theona

Fruit Salad

As the trees come into fruit it increases the incidence of monkey sightings around the producing trees.  Near the entrance to the Bosque restaurant some of the Royal Palms, (Attalea rostrata), are heavy with palm nuts.  Currently on a daily basis the White-faced Capuchin Monkeys, (Cebus capucinus), take time to visit and feed.  They will also feed on coconuts, (Cocos nucifera), many palms of which can be found fruiting year round near the Royal Palms.

It is not only the monkeys but the Red-tailed Squirrels, (Sciurus granatensis), too that enjoy both the coconuts and palm nuts.  They tend to keep a low profile when the monkeys are around but it is not too hard to find them if you look.

The bird life is as rich and varied as ever.  Reptile sightings are good but as might be expected the amphibian numbers are low.  The Black and Green Poison Dart Frogs, (Dendrobates auratus), can still be seen on the forest trails but no longer in profusion as when it was wetter.  Some of the larger frogs such as Savage’s Thin-fingered Frog, (Leptodactylus savegei), and the Marine Toad, (Rhinella marina), have started to congregate around the pond as the forest dries up.

Philip is a biologist, writer and photographer as well as the onsite naturalist guide at Bosque del Cabo Rainforest lodge on the Osa Peninsula, Costa Rica.

Photo Feature

Smelling You Out

Over the last week many visitors who have walked the Titi Trail have come across herds of Collared Peccary, (Tayassu tajacu).  There are many stories concerning the ferocity of these distant relatives of the pigs but they are completely without foundation, at least at Bosque.  They don’t have very efficient eyes or ears but they do have an excellent sense of smell.  Although they may have some difficulty seeing or hearing you they will have no problem determining that you are there if you are stood upwind of them.  If you are downwind they will largely be oblivious to your presence.

Collared Peccary

As it happened, one day I was out on the Titi Trail on my own looking to take photographs of whatever may present itself and relying on serendipity to provide the subject material over the course of the morning.  I am always looking for small things, most of my work is macro photography and you will rarely see photographs of mammals and birds illustrating my text.  I could hear ahead of me the sound of grunting and snuffling and it wasn’t too long before a sizeable herd of Collared Peccaries came towards me through the forest.  I stood where I was on the path and readied the camera on the tripod.  I did not move but waited until one or two of the peccaries crossed the path in front of me wholly oblivious to my presence.  I pressed the shutter, off went the flash and the startled animals leapt into the brush at the side of the path.  They weren’t quite sure as to what had happened and as curiosity got the better of them they tentatively returned, looking towards what had moments ago surprised them.  I still wasn’t moving.  Their noses lifted in the air to catch my scent but I was downwind.  Off went the flashes again which this time was too much so they scampered back the direction from which they had initially came to rejoin the rest of the herd.

Tayassu tayacu

Collared Peccaries can be found from the Southern United States down through Central American and throughout tropical South America.  They feed largely on fallen fruits and seeds as well as low growing plants.  They will also eat a small amount of animal life such as grubs, lizards and snakes.  They are usually found in herds and at Bosque have been seen in the vicinity of the Titi Trail numbering more than 20 in a group.

One the back down the road on the approach to the restaurant sitting under a palm feeding on the fallen palm nuts was an Agouti, (Dasyprocta punctata).  Agoutis are not an uncommon sight around the restaurant area on the lawns in front of the cabins.  They are caviomorph rodents related to capybaras, coypus and cavies or Guinea Pigs.  Agoutis are commonly seen around the grounds in the open areas feeding on large fallen fruits.  They are present in the forest too but not as obvious as they skulk around in the undergrowth.


There has been a single bat roosting in the thatch of the Bosque restaurant for the past few weeks.  As the sun sets it can be seen cleaning itself and stretching its wings in preparation for its venture into the night air.  At same time as the guests to the hotel are dining in the evening the bat heads off in search of a meal too.

Unidentified Bat

It is very hard to identify bats.  First there are a lot of them, approximately 80 species on the Osa Peninsula. Without having them in hand it is difficult to scrutinize those diagnostic features vital to species identification.  Finally they tend to roost in inaccessible places so the best you are likely to see of bats is there silhouettes in flight against a darkening sky.  This one although tucked up in the thatch and therefore difficult to photograph was at least at a level where I could get a picture of some of the face.  That narrows down some of the options.  So we can see it doesn’t have a leaf nose, the ears are smaller and rounded and the fur is orangey brown.   That eliminates it from several families but I still wouldn’t like to say for sure exactly what it is.

Text and Photographs are taken from the forthcoming book:

The Natural History of Bosque del Cabo by Philip Davison

Temperature and Rainfall

Average Daily Rainfall 0.09 ins.  Total Weekly Rainfall 0.56 ins

Average Daily Rainfall 2.40 mm.  Total Weekly Rainfall 14.20 mm

Highest Daily Temp 89°F.  Lowest Daily Temp 73°F.

Highest Daily Temp 31.8°C.  Lowest Daily Temp 23.5°C.

Species List for the Week


  • Howler Monkey
  • Spider Monkey
  • Squirrel Monkey
  • White-faced Monkey
  • White-nosed Coati
  • Alfaro’s Pygmy Squirrel


  • Mealy Amazon
  • Orange-chinned Parakeets
  • Red-lored Amazon
  • Scarlet Macaw
  • Broad-winged Hawk
  • Crested Caracara
  • Mangrove Black Hawk
  • Roadside Hawk
  • Golden-naped Woodpecker
  • Lineated Woodpecker
  • Pale-billed Woodpecker
  • Red-crowned Woodpecker
  • Long-tailed Woodcreeper
  • Tawny-winged Woodcreeper
  • Chestnut-backed Antbird
  • Short-billed Pigeon
  • White-tipped Dove
  • Rufus Piha
  • Long-billed Hermit
  • Rufus-tailed Hummingbird
  • Red-capped Manakin
  • Chestnut-mandibled Toucan
  • Bright-rumped Atilla
  • Dusky-capped Flycatcher
  • Great Kiskadee
  • Golden-crowned Spadebill
  • Riverside Wren
  • Tennessee Warbler
  • Great Tinamou
  • Black-throated Trogon
  • Masked Tityra
  • Black Vulture
  • Turkey Vulture


  • Barred Ameiva
  • Basilisk
  • Cat-eyed Snake
  • Central American Smooth Gecko
  • Central American Whiptail
  • Common Anole
  • Four-lined Ameiva
  • Golfo Dulce Anolis
  • Litter Skink
  • Mediterranean House Gecko
  • Terciopelo


  • Banana Frog
  • Fitzinger’s Rain Frog
  • Marine Toad
  • Masked Smilisca
  • Red-eyed Green Tree Frog
  • Rough-skinned Dirt Frog
  • Savage’s Thin-fingered Frog
  • Stejneger’s Dirt Frog


  • Adelpha cytherea
  • Adelpha heraclera
  • Anartia Fatima
  • Anartia jatrophae
  • Chlosyne theona
  • Dryas iulia
  • Eueides aliphera
  • Eueides lybia
  • Heliconius cydno
  • Heliconius erato
  • Heliconius hecale
  • Heliconius ismenius
  • Heliconius sapho
  • Heraclides cresphontes
  • Hermeuptychia hermes
  • Mesosemia zonalis
  • Morpho helenor
  • Morpho Menelaus
  • Pareuptychia ocirrhoe
  • Parides erithalion
  • Pierella helvina
  • Phoebis sennae
  • Pompeius pompeius
  • Pyrgus oileus
  • Pyrrhogyra crameri
  • Urbanus simplicius


  • Alamandra  cathartica Flowering
  • Alpinia purpurata Flowering
  • Apeiba tibourbou Flowering
  • Arachis pintoi Flowering
  • Arundina graminifolia Flowering
  • Attalea rostrata Fruiting
  • Bauhinia variegata Flowering
  • Cascabella thevetia Flowering and Fruiting
  • Citrus spp  Fruiting
  • Clusia rosea Flowering and Fruiting
  • Clusia vallerii Flowering and Fruiting
  • Cocos nucifera Flowering and Fruiting
  • Crestentia alata flowering and Fruiting
  • Costus speciosus Flowering
  • Couroupita guianensis Flowering and Fruiting
  • Dypsis lutescens Flowering and Fruiting
  • Etlingera elatior Flowering
  • Ficus citrifolia Fruiting
  • Ficus insipida Fruiting
  • Jacaranda mimosifolia Flowering
  • Heliconia chartacea Flowering
  • Heliconia latispatha Flowering
  • Heliconia pogonantha Flowering
  • Heliconia psittacorum Flowering
  • Heliconia rostrata Flowering
  • Hibiscus rosa-sinensis Flowering
  • Hymenaea coubaril Fruiting
  • Hymenocallis littoralis Flowering
  • Ixora coccinea Flowering
  • Lantana camara Flowering and Flowering
  • Lagerstroemia speciosa Fruiting
  • Morinda citrifolia Fruiting
  • Musa acuminate Flowering and Fruiting
  • Nephelium lappaceum Fruiting
  • Piper auritum Flowering and Fruiting
  • Piper nigrum Fruiting
  • Piper umbellatum Flowering and Fruiting
  • Pleiostachya pruinosa Flowering
  • Plumeria rubra Flowering
  • Psychotria sp Fruiting
  • Stachytarpheta frantzii Flowering
  • Virola guatemalena Fruiting
  • Zammia sp Flowering



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