Abarema mataybifolia (Sandwith) 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
"BRITISH GUIANA: Bartica-Potaro road, 107 miles, Nov. 15th, 1943, D. B. Fanshawe in Forest Dept. no. 4232." — Holotypus, K! = NY Neg. 2039!; isotypi, K!, NY!
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Synonyms
Pithecellobium mataybifolium Sandwith
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Description
Species Description - Macrophyllidious trees 8-20 m, with trunk 8-30 cm dbh, glabrous except for densely brown-sordid- puberulent axillary buds and inflorescence, the ample chartaceous lfts olivaceous sublustrous above, paler beneath, the inflorescence consisting of capitula borne on solitary and 2-3-nate peduncles either axillary to distal lvs or forming a short terminal pseudo-raceme. Stipules not seen, perhaps very small caducous, but possibly lacking (scar obscure). Lf-formula i-ii/2- 3(4), the lfts 8-16(24) per lf; lf-stk 1-8 cm, the true petiole including wrinkled pulvinus 1-5 cm, the interpinnal segment, when present, to 4.5 cm; petiolar nectaries at insertion of first or only pair of pinnae amorphous, immersed in groove of petiole or shallowly sunken and rugulose, sometimes with a minute cone and pore near middle, lacking from tip of pinna-rachises; rachis of pinnae 4.5-12 cm, the one or the longer of two interfoliolar segments (2-)2.5-6 cm; lf-pulvinules in dorsal view (4.5-)5-9 x 1-2 mm, densely cross-wrinkled; lfts slightly accrescent distally, subequilaterally ovate or elliptic-ovate from broad-cuneate or, especially on anterior side, rounded base, shortly obtusely acuminate, the blade of distal pair 8-14 x 3-7.5 cm, 1.8-2.3(-2.5) times as long as wide; venation densely pinnate, the widely ascending secondary nerves brochidodrome well within the loosely revolute margin, all these and an elaborate reticulum of lesser veinlets prominulous on both faces. Peduncles 2-5 cm; capitula ±15—20-fld, the subglobose or shortly clavate receptacle ±3 mm; bracts somewhat dimorphic, the lower ones triangular to lanceolate, 2.5-2.75 x ±1 mm, the upper becoming elliptic, elliptic-spatulate, or spatulate, and smaller, all very quickly deciduous; perianth 5-merous, rusty-pilosulous externally; fls dimorphic, the peripheral ones pedicellate, the terminal one (few seen) sessile and a trifle coarser; PERIPHERAL FLS: calyx campanulate 2-3.6 mm, cuneately narrowed at base into a pedicel 2-3.6 mm, the triangular-ovate teeth 0.5-0.8 mm; corolla narrowly trumpet-shaped 6.3-7.4 mm, the apically cucullate lobes 1.6-2 mm; stamens 18-28, the tube, including the stemonozone, 3-3.5 mm; TERMINAL FL: corolla hardly longer than the rest, but the staminal column exserted to 2 mm; corolla of all fls greenish; the filaments white, brownish in fading; ovary glabrous, at apex a little swollen and obliquely truncate; ovules 10-14. Pods 1—2 per capitulum, in recurved through half or nearly a complete circle, ±10-20 x (1.3—)1.8-2.6 cm, 9-14-seeded, at first piano-compressed and framed by thickened, very shallowly undulate sutures, the brown or fuscous, glabrous valves becoming low-convex over each seed, coarsely transverse- and reticulate- venose externally, within red-crimson overall; dehiscence of Abarema; funicle ribbonlike, contorted distally; seeds plumply lentiform-globose, in broader view 8-9 x 7-8 mm, described when fresh as gray or deep blue, but brunnescent when dried, the membranous translucent testa scarcely 0.05 mm thick in section, closely investing the hard embryo but sometimes a little wrinkled, pleurogram 0; cotyledons planoconvex, closely appressed. Eopylls opposite, bipinnate, subsequent lvs alternate, all of formula i/2.
Distribution and Ecology - In virgin and second-growth, non-inundated forest below 170 m, scattered in E equatorial South America in lat. 8°N-5°S, from the Barima River in Guyana SE to Paragominas in NE Pará, Brazil, and west to vicinity of Manaus. — Map 20. — Fl. II, IX-XI.
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Discussion
Abarema mataybifolia is notable among macrophyllidious abaremas for the long pulvinule of the leaflets.
Perhaps related to A. mataybifolia is B. Hoffman 3251 (NY), collected in swamp scrub between 1100 and 1500 m on the plateau of Mt. Ayanganna in the Pakaraima Range of Guyana. The material is immature, but the flowers seem compatible with A. mataybifolia. The leaf-formula, however, is only i/1-2 and the leaflets are subsessile, not raised on a petiolule 5-9 mm long.
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Common Names
huruassa
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Distribution
Guyana South America| Suriname South America| French Guiana South America| Pará Brazil South America| Amazonas Brazil South America|