Abarema ganymedea Barneby & J.W.Grimes
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Authors
Rupert C. Barneby
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Authority
Barneby, Rupert C. & Grimes, James W. 1996. Silk tree, guanacaste, monkey's earring: a generic system for the synandrous Mimosaceae of the Americas. Part I. Abarema, Albizia, and allies. Mem. New York Bot. Gard. 74: 1-292.
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Family
Mimosaceae
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Scientific Name
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Type
COLOMBIA. Antioquia: Chigorodó, carretera a Turbo, 100-200 m, 2Q-23.xii.1962, H. García-Barriga 17624. — Holotypus, US 2558153 = NY Neg. 12544; isotypi, COL, GH.
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Etymology
Etymology: of Ganymedes, cup-bearer to Zeus, in allusion to the cupular petiolar nectaries.
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Description
Species Description - Amply microphyllidious trees attaining 20 m, with much-branched crown and mottled gray annotinous branches, the young stems, all lf-axes and peduncles densely pilosulous with sordid but pallescent hairs <0.3 mm, the lvs bicolored, the lfts when dry dark brown and except for exiguously ciliolate midrib glabrous above, beneath dull pale gray-green and minutely remotely strigulose, the capitula of white fls solitary and paired in the axil of few distal lvs, (few seen) lanceolate ±2.5 mm, pubescent dorsally like stem, caducous. Lf-formula (vi-)viii-x/14-19; lf-stks 8-13.5 mm, the petiole 10-19 mm, at middle 1.2-1.5 mm diam, the longer interpinnal segments 10-15 mm; a coarsely coriaceous infundibuliform nectary 1-2 mm tall and 1.2-2.5 mm diam immediately below first pair of pinnae and similar but smaller ones between 2-4 distal pinna-pairs and at tip of each pinna-rachis; pinnae proximally decrescent, thence subequilong, the rachis of median and distal ones 4-7 mm, the first pair of lfts arising directly next to pinna-pulvinus, the longer interfoliolar segments 3-5.5 mm; lft-pulvinules ±0.2 x 0.4 mm; lfts (except for slightly broader furthest pair) subequilong, in outline oblong from inequilaterally flabellate base, broadly obtuse, the larger ones 6.5-8.5 x 2.7-3.5 mm, ±2.4-2.8 times as long as wide; venation of 1-2 nerves from pulvinule, the medially diagonal, nearly straight midrib and one fine (almost obsolete) posterior nerve incurved to anastomosis a little beyond midblade and close within the plane, minutely ciliolate margin, the midrib pinnately 6-branched on each side, tertiary venules random obscure, the whole venation discolored but immersed on upper face, finely prominulous beneath. Peduncles 1.5-4 cm; capitula ±12—25-fld, without filaments ±10 mm diam, the receptacle including short terminal pedestal 2-3 mm; bracts obovate 0.5-0.8 mm, sericeous dorsally, caducous; fls dimorphic, the peripheral ones raised on pedicel to 0.5-0.8 mm, the terminal one sessile, larger, and with modified androecium, the perianth of all 5-merous and sordid-strigulose externally, the corolla lobes densely so at tip; PERIPHERAL FLS: calyx ±1.8 x 1.1 mm, the deltate teeth 0.3-0.5 mm; corolla 4-4.2 mm, the ovate lobes 1.7-0.7 mm; androecium 10-merous, to 15.5 mm, the stemonozone almost 0, the tube 1.3 mm; ovary glabrous, conical at apex; style longer than longest filaments, the stigma poriform; TERMINAL FL: calyx 2.8 x 1 mm; corolla 6.5 mm; androecium 15-merous, the stemonozone 1.8 mm, the stout and firm, apically dilated tube as long as corolla, the free filaments thickened proximally; gynoecium depauperate, probably infertile; style included. Pods geotropic, undulately linear ±14 x 1 cm, attenuate at base into a pseudostipe ±1 cm, cuspidate at apex, ±11-seeded, the body recurved through more than 360° and also randomly twisted, the seminiferous suture deeply recessed between seeds, the brownish puberulent leathery valves coarsely reticulate-venulose over each seed; ripe seeds not seen.
Distribution and Ecology - In wet forest, known only from between 100 and 200 m along the road between Chigorodó and Turbo, near 8°N in far N Antioquia, Colombia, and from 250 m in Cantón S. Lorenzo at 0°55'N in Esmeraldas, Ecuador. — Map 12. — Fl. XII-?.
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Discussion
Abarema ganymedea suggests a Pacific lowland counterpart of the Amazonian A. auriculata, from which it differs in more numerous leaflets (see Latin diagnosis for figures) puberulent on lower face, in the cupular (not mounded) petiolar nectary, and (in one known flowering specimen) an androecium reduced to 10 members. If we correctly associate with the flowering holotype the fruiting specimen (Rubio & Quelal 722, NY) from Ecuador, A. ganymedea differs further from A. auriculata in the deeply recessed ventral suture of the pod, which altogether is reminiscent of A. piresii in quasimoniliform outline.
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Distribution
Antioquia Colombia South America| Esmeraldas Ecuador South America|