Attalea butyracea (Mutis ex L. f.) Wess. Boer
Common Name: PALMA REAL, COROZO, ROOSTER-TAIL PALM
Common evergreen understory tree (10-15 m) that sometimes appears
as a component of the lower layers of primary forest, but more
often is located in sunnier areas where the vegetation has been
disturbed (along trailsides, amid secondary forest). Palma Real
leaves are oriented in a vertical (not horizontal) plane, and
this unique feature helps to distinguish this species. Often a
prolific producer of palm nuts, many mammals rely on Palma Real
as one of their major sources of food during the early months
of the wet season.
Description: Palma Real has a straight,
cylindrical trunk (40 cm). Flaring slightly at it's base
to accommodate the emergence of many fibrous roots, the columnar
bole maintains an otherwise uniform diameter. Smooth, spineless,
and gray-brown in color, the palm's surface is conspicuously marked
by the wide, encircling, and periodic leaf scars typical of all
Arecaceae. The extremely large leaves (6 by 0.8 m) are
confined to the pinnacle of the tree, and they emanate from a
common locus where the growth-producing palm heart is found. Palma
Real fronds are pinnately compound, and the numerous, dark-green,
ribbon-like leaflets all lie within a single plane and are attached
to a thick, dark-brown, petiole. More notable and distinguishing,
however, is the manner in which these fronds are extended. Angled
upwards, the plane containing the frond leaflets is vertically
oriented. About 2/3 of the way from its point of attachment to
the bole, the petiole weakens and bends, causing the distal portion
of the frond to droop downward.
Thus oriented, the Palma Real
leaf bears a marked resemblance to the tail of a rooster (hence
the English common name for this species). New foliage is produced
continuously, with the folded frond spikes growing vertically
from the top of the apical bud. As more leaves are formed, the
older ones are gradually displaced laterally - pushed to the sides
of the crown. Over time, the petioles are slowly rotate away from
the tree's apex. Before they become completely horizontal, the
fronds die and fall from the tree. Flowers (1 cm) appear
in huge racemes (1 m) that grow from in leaf axils. Initially
protected by equally large, woody, boat-shaped coverts, the white
racemes support a staggering number of rice-like or three-petaled
blossoms. A strong and pungent smell emanating from these racemes
penetrates the humid forest air and is often the first clue that
a fertile raceme is near. (This musty odor can be so omnipresent
and persistent that it is often associated with the dank rainforest
environment.) Flower racemes continue to appear over an extended
period of time - though relatively infrequently - during the mid
to late rainy season (from late June to November). Soon after
flowering, large numbers of fruits begin to thickly pack the same
racemes. Each fruit is a sessile, ovoid drupe (4 by 2.5
cm) with a pronounced distal point and a large, star-shaped calyx
located proximally. Ripening from green to a dull, yellow-brown
or burnt-orange color, the fruit possesses a soft layer of mildly-sweet,
rich, and greasy flesh underneath a thin, woody skin. A single,
large, central seed fills the fruit core. Though these nuts reach
full size within two months after flowering, ripening and harvest
are delayed until the early part of the following rainy season.
These heavy, pendulous racemes thus accumulate slowly during the
later part of the rainy season, remaining dormant during the dry
"summer" months. Ripening only commences in May, with
the onset of the first heavy rains. Fruits continue to mature
until August.
Similar Species: Palma Real is probably the largest wild palm in this region. Mature trees have crowns at least twice as wide as either of the other two large palms common here - the coconut palm (Cocos nucifera) and the Chontadura palm (Astrocaryum confertum). Furthermore, coconut palms are restricted to the sandy coast (where Palma Real is never found) and they have coconuts(!) while Chontadura palms have a thickly - and dangerously - spined trunk. In any case, Palma Real is distinctive because of its unusual, "rooster-tail" leaf arrangement.
Natural History: Palma Real flowers attract many pollinators with their potent, penetrating odor but the small, black, stingless "cuchuco" (Trigona sp.) bees are particularly common visitors. Fruits are eaten my many arboreal mammals, with pizotes and white-faced monkeys seen most frequently - harvesting drupes directly from the canopy.
Uses: Palma Real foliage has
been and is used extensively in the construction of thatched roofs.
If harvested at the correct time (with leaves being neither too
old nor too young), roofs made out of this material can last for
four years or more. The large fronds are split longitudinally,
along the mid rib. Then they are positioned side by side and tied
to rafters made of poles. Finally, the leaflets are woven together.
Generally, roofs made of palm leaves must be quite steep to encourage
the runoff of rainwater and to avoid seepage and leaks.
Palma Real fruits are edible and good-tasting, with a thick -
almost dry - consistency, and a mildly sweet and nutty taste.
Distribution: In Costa Rica, Palma Real is a common component of the Pacific coastal vegetation. It is often seen growing solitarily (or in stands) in pastures, where it has been purposely left to provide fodder for cattle. Palma Real ranges from Nicaragua to Panama.