Abarema auriculata (Benth.) Barneby & J.W.Grimes
-
Authors
Rupert C. Barneby
-
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.
-
Family
Mimosaceae
-
Scientific Name
-
Type
"Borba, on the Río Negro [in reality on lower Río Madeira], in Brazil, [Riedel, commun.] Langsdorff." — Holotypus, K(herb. bentham.)! = NY Neg, 2010; isotypi, A!, OXF!.
-
Description
Species Description - Microphyllidious shrubs and slender trees (2—)3—15 m tall, the young stems and all axes of lvs and inflorescence densely puberulent with forwardly incurved, sordid or golden-brown hairs to 0.1-0.2 mm, the foliage strongly bicolored, the plane, facially glabrous but often minutely ciliolate lfts when dry dark brown and nearly always pallid-spotted above, paler beneath, the capitula of whitish fls single and paired in coeval lf-axils and immersed in foliage. Stipules linear, to 0.7-1.8 mm, caducous before expansion of associated lf. Lf-formula v-ix/9-12; lf-stk of larger lvs (5-)6- 14(—18) mm, the petiole including dilated fuscous pulvinus 5—13(—16) mm, the longer interpinnal segments 8-18 mm; petiolar nectary (rarely 2) immediately below insertion of first pair of pinnae verruci- or mammiform 0.7-1.3 mm diam, a smaller nectary sometimes at tip of lf-stk and yet smaller cupular ones often at furthest 1-2 pairs of lfts; pinnae abruptly decrescent near base of lf-stk, thence subequilong and often not exactly opposite, the longer ones (3.5-)4-7 cm, the longer interfoliolar segments 4-6 mm; pulvinules 0.3-0.5 x 0.5-0.6 mm; lfts (except for obliquely elliptic distal pair) subequiform, in outline obliquely rhombic or rhombic-oblong from inequilaterally cuneate or rectangular base, broadly obtuse or emarginate, 6-13 x 4—6 mm, (1.5-) 1.6-2.4 times as long as wide; the diagonal, straight or obscurely sigmoid midrib immersed or shallowly depressed on ventral face of blade, sharply finely prominulous dorsally and there giving rise on anterior side to 4-7 secondary nerves brochidodrome within the almost plane margin, no tertiary venulation visible externally. Peduncles 1.5-3.5 cm; capitula 12-24-fld, the subglobose or clavate receptacle 2-4 mm, the fls dimorphic, the terminal one with exserted stamen-tube and free filaments basally thickened; bracts firm, ovate or lanceolate, decrescent upward, the longest ±2-4 mm, persistent into and beyond anthesis; fls normally dimorphic, the perianth of all 5-merous or that of terminal fl 6-merous, all sessile or the lowest of a capitulum elevated on pedicel to 0.7 mm, the perianth of all densely brownish silky-puberulent or the corolla glabrescent below the lobes; PERIPHERAL FLS: calyx 23-2.1 x 1.4-2 mm, the tube obtusangulate, the teeth 0.4-0.7 mm; corolla narrowly vase-shaped 4.5-6.2 mm, the lance-ovate lobes 1.2-1.6 mm; androecium 14-18-merous, 17-22 mm, the stemonozone 0.6-1.3 mm, the tube (2.2-)3-5 mm; ovary narrowly ellipsoid, conical at tip, glabrous; stigma scarcely dilated; TERMINAL FL: calyx 3-7.5 mm, corolla 6-7 mm, staminal tube 8-8.5 mm, the free filaments thickened and recurving at base. Pods 1-2 per capitulum, subsessile, in outline broad-linear recurved through 1/3-2/3-circle, to 13 cm and 1.2-1.6 cm wide, up to 12(-14)-seeded, the fuscous, smooth or faintly venulose, stiffly papery valves low-convex or hemispherically dilated over each seed, framed by sutures 1.5-2.5 mm wide, orange-red internally; seeds (few seen) plumply lentiform, ±7-8 mm diam, the translucent testa aging dull fawn-brown, pleurogram 0.
Distribution and Ecology - In capoeira, at edge of blackwater streams, and in forest-campina ecotone, mostly, perhaps exclusively, on white sands above the annual flood line, below 150 m, scattered along the Amazon River and its immediate tributaries from the Río Caquetá near 72°W in Amazonas, Colombia, and the lower Río Ucayali near 74°W in Loreto (prov. Requena), Peru, downstream to Gurupá near 51°30'W in Pará, Brazil. — Map 12. — Fl. (VII)X-XII.
Local Names and Uses - Pashaco, pashaquillo (Peru).
-
Discussion
Abarema auriculata differs from sometimes hab- itally similar A. jupunba var. jupunba in smaller leaflets (at most 13 mm long) glabrous on both faces, and in specialized campirana ecology. For differential characters of closely related but allopatric A. ganymedea see commentary on that species (p. 61).
-
Common Names
Pashaco, pashaquillo
-
Distribution
Amazonas Colombia South America| Loreto Peru South America| Pará Brazil South America| Amazonas Brazil South America|