Mimosa tarda Barneby

Authors

Rupert C. Barneby

Authority

Barneby, Rupert C. 1991. Sensitivae Censitae. A description of the genus Mimosa Linnaeus (Mimosaceae) in the New World. Mem. New York Bot. Gard. 65: 1-835.

Family

Mimosaceae

Scientific Name

Mimosa tarda Barneby

Type

267. Mimosa tarda Barneby, sp. nov., M. pellitae sens. lat. arete et propter leguminis eseptati articula ipsa dehiscentia ejus var. dehiscenti arctissime affinis, sed stipulis toto glabris castaneis striatim 10-20-nerviis bracteisque interfloralibus 3-5-n

Synonyms

Mimosa pellita Humb. & Bonpl. ex Willd.

Description

Species Description - Riparian shrubs mostly 1.2-3 m, in habit and inflorescence resembling and sometimes sympatric with closely related M. pellita, the stems and lf-stks either strigose with fine appressed setae (1-) 1.5-3 mm or hispid with subhorizontal ones 2-3 mm, the lf-stks never aculeate, the stems sometimes randomly armed with two immediately infrastipular and one distantly displaced infrapetiolar, stout broad-based, almost straight but distally declined brownish aculei 3-7 mm. Stipules ovate or lanceolate 4.5-8.5 x (1.5—)2—3.5 mm, the papery blades castaneous glabrous, striately 10-20-nerved, persistent. Leaf-stalks of major lvs 9-17 cm, charged between each pinna-pair with a sharp ascending spicule (1—)2—9 mm; pinnae (9-) 10-17-jug., the rachis of longer ones (2.5-)3-5(-6) cm, the interfoliolar segments 0.6-1.3 mm; lfts of longer pinnae 30-46-jug., the linear, basally blunt-auriculate blades acute at apex, those at mid-rachis 6-11 x 0.7-1.6(-2) mm, 5-8.5 times as long as wide, dorsally venose with 4-5(-6) subparallel nerves nearly to blade apex. Peduncles 1.5-4 cm; capitula without filaments 5-6.5 mm diam., at least when young conelike; bracts ovate or lanceolate cymbiform (1-) 1.5-3 mm, (3-)5-7-nerved, glabrous dorsally, ciliolate; flowers with calyx 0.7-1 mm, the orifice either fimbriolate or paleaceous-dissected; corolla 2.7-3.5 mm, the lobes at least thinly strigulose; filaments pale lilac-pink, united at base into a stemonozone ±0.5 mm, exserted 2-3 mm. Pods mostly 5-15 per capitulum forming an umbelliform cluster, the stipe 1—6(—9) mm, the almost straight body excluding terminal cusp 40- 60(-65) x 9-11 mm, 16-22-seeded, the thinly papery valves turning livid and lustrous, hispid like the replum with slender erect-spreading yellowish setae (1.5-)2-3.5(-4) mm, the interseminal septa 0 or vestigial and fragile, not sealing the individual articles, these curling back to release the seeds; seeds narrowly oblong-elliptic in profile ±5-6 x 2-2.5 mm, the olivaceous testa smooth dull.

Distribution and Ecology - In wet places, on lake-shores and river-banks, 5-800 m, discontinuously dispersed in tropical N. and S. America, lat. 18°N-16°S: fairly frequent in Central America around the Gulf of Honduras (Belize, e. Guatemala and Honduras), thence s.-e. to n. Colombia (Antioquia); n.-w. Ecuador (Esmeraldas, Pichincha, Manabí); inter-Andean valleys of centr. Peru (Huanuco, Junin); upper forks of río Beni in Yungas, Bolivia; distantly disjunct, in slightly different form (stems hispid, not strigose) in e. Brazil (Ceará, Bahia and, perhaps introduced, coastal Sta. Catarina).—Fl. nearly throughout the year. Map 37.

Discussion

Distribution

Honduras Central America| Guatemala Central America| Colombia South America| Antioquia Colombia South America| Ecuador South America| Esmeraldas Ecuador South America|