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Project Name Data (Last Modified On 11/15/2012)

Flora Data (Last Modified On 11/15/2012)
PlaceOfPublication Nov. Gen. & Sp. 6:276. 1824.
Synonym ?Mimosa retusa Jacq. Enum. PI. Carib. 34. 1762, fide Ind. Kew. Mimosa paniculata West, Bidr. til Beskr. Ste.-Croix, 312. 1793; non authors, fide Ind. Kew. Acacia Westiana DC. Prodr. 2:464. 1825, fide Benth. Acacia guadalupensis DC. loc. cit. 1825. ?Mimosa Plana Vell. Fl. Flum. Ic. 11:t. 28. 1827, fide Benth. Acacia quadriglandulosa Mart. in Flora 20, Beibl. 2:110. 1838, fide Ind. Kew. Acacia tubulifera Benth. in Hook. Lond. Jour. Bot. 1:520. 1842, fide Macbride. Acacia sarmentosa Griseb. Fl. Brit. W. Ind. 221. 1861; non Desf., fide Ind. Kew. Senegalia riparia Britt. & Rose, in Ann. N. Y. Acad. Sci. 35:144. 1936.
Description Shrub or tree (or often subscandent), sparingly aculeate on leaf rachis and twigs, with small, scattered, recurved thorns, the branchlets puberulent soon be- coming glabrous, striate. Leaves moderately large, bipinnate, the pinnae 6-20 pairs opposite on the rachis, the leaflets many (mostly 20-40) pairs per pinna; petiole about 2 cm. long, sulcate above, subglabrous, bearing on the upper side 1 or more (usually 2) sessile, patelliform, longitudinally oblong glands; rachis up to 15 cm. long, sulcate and puberulent above,- bearing glands like those of the petiole just below the several distal rachial nodes; pinnae! usually 4-5 cm. long, eglandular; leaflets linear-oblong, 3-7 (usually 4-5) mm. long and about 1 mm. wide, more or less rounded to broadly acute apically, obliquely rounded or subtruncate basally, glabrous above and below, usually ciliate marginally and barbate at the base on the inner margin below, the costa subcentral except at the inequilateral base, it and a few remote lateral veins prominent below, dull; stipules caducous or lacking. In- florescence seemingly a raceme or panicle of pedunculate heads, these 1- to few-fasciculate from subterminal defoliate or tardily foliate nodes (nodes foliate in age or with fruit); peduncle 1-2 cm. long at anthesis, tomentulose; head dense, sub- globose, about 30-flowered. Flowers sessile, whitish; calyx cupular, 1 mm. long, puberulent; corolla funnelform, 3-4 mm. long, puberulent apically, the lobes brief; stamens many, free, about 6 mm. long. Legume linear-oblong, usually 10-15 cm. long and 20-25 mm. wide, stipitate, tomentulose, usually sharp-beaked apically, -flat and thin, the margins slightly elevated, the seeds transverse.
Habit Shrub tree
Distribution Middle South America to southern Central America; perhaps northern Central America and southern Mexico?
Specimen CANAL ZONE: Barro Colorado Island, Aviles I4; Brawn I48; Shattuck 436; Wetmore & Abbe 205; Woodworth & Vestal 512. CHIRIQUf: San Felix, Pittier 5I41.
Note Possibly the name Acacia retusa should apply to this species, but inasmuch as none of the types are available and Bentham himself had only "ex char." acquaint- anceship with Mimosa retusa Jacq., which he listed as synonymous, we do not sug- gest any change in the familiar name, A. riparia. The species seems to grade into what commonly passes for A. riparioides in northern Central America and Mexico, differing from it primarily in having a somewhat longer corolla. The Chiriqui specimen is somewhat atypical, having larger flowers approaching those of A. Hayesii.
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