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A Description of the Genus Mimosa

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A Description of the Genus Mimosa Rupert C. 1991] BARNEBY: .SENSITIVAE CENSITAE (MIMOSA! 135 orous Ifis minutely ciliolate, nowhere glandular do). —Fl. X, IV, the full season unknown. but the very young shoots subresinous, the in­ Map 9. florescence a small panicle of spikes solitary or Among Leiocarpae this species is strongly 2-3 together in axil of coeval lvs, the long narrow characterized by very numerous, crowded, finely pods immersed in foliage. Stipules erect, narrow­ but sharply trinerved leaflets and by white flow­ ly lanceolate 2-5 x 0.4-0:6 mm, dorsally ers giving rise to narrow moniliform, bluntly te­ I-nerved, deciduous. Leaf-stalks 6-12 cm, the tragonal pods with replum as wide as or a little petiole including livid pulvinus 15-24 mm, the wider than the valves, which break into excep­ interpinnal segments 6-20 mm, the narrow ven­ tionally long, narrower articles. The Bolivian tral sulcus bridged between pinnae and charged M. dalyi is alone like it in pod-structure, but this with a weak, minutely puberulent spicule 0.5- has more than twice as many pinnae, leaflets 1.2 mm; pinnae 5-10-jug., subequilong or errat­ more faintly trinerved, minutely rufous-lepidote ically graduated, the rachis of longer ones 5-9 flowers, and pink filaments. The curious story of cm, the interfoliolar segments 0.6-1.3 mm. their Schranckiaslrum, based on misinterpretation of ventral ridge wider distally, the whole rachis, the pod's replum as persistent entire valves and shorn of lfts. appearing serrate in profile; lfts of of its valves as a disarticulating replum, has been longer pinnae ±40-70-jug., subequilong except recounted elsewhere (Barneby, 1984). at very base of rachis, the first pair 0.4-1 mm distant from minute ascending paraphyllidia, the 69. Mimosa tenuiflora (Willdenow) Poiret, En- blades linear-lanceolate from obliquely obtusan- cycl. Suppl. 1: 82. 1810, based on Acacia te­ gulate base, those near mid-rachis 6-9.5(-10) x nuiflora Willdenow, Sp. pl. 4: 1088. 1806.- 0.8-1.1 mm. 7.5-10 times as long as wide, the "Habitat ad Caracas. Bredemeyer."—Holo- ventral face veinless or almost so, the dorsal one typus, Bredemeyer 20 in B-WILLD 19189, seen pallidly 3-nerved, the midrib centric, the pri­ in microform! —Non M. tenuiflora Bemham, mary nerve on either side submarginal and pro­ 1846. duced to blade apex. Axis of flower-spikes iclud- ing short peduncle (4-)4.5-9.5 cm; bracts Acacia hostilis Martius in Spix & Martius, Reise Bras. membranous oblanceolate incurved ± 1 mm, ca­ 1:555. 1823"—". .im Algadisso[onrioS. Francisco ducous; flowers sessile 4-merous 8-androus, pu­ near 15°S]." —Holotypus. Martins 1856, collected berulent overall; calyx membranous shallow- - .IX'.rSlS (fr), M! = F Neg. 6755 = IPA Neg. 1348.- - Mimosa hostilis (Martius) Bentham, Trans. Linn. campanulate ± 1 mm, the low-deltate teeth 0.4— Soc. London 30: 415. 1875 & in Martius, Fl. bras. 0.5 mm; corollas whitish turbinate 2.2-2.5 mm, 15(2): 359. 1876. M. apodocarpa var. hostilis (Mar- the ovate, faintly 1-nerved, shallowly concave tuis) Hassler, Repert. Spec. Nov. Regni Veg. 9: !. lobes ±1.3 x 1 mm; filaments white, monadel- 1910. Mimosa cabrera Karsten, Fl. Columb. 2: 63. t. 132. phous through ±0.5 mm, exserted 4-5 mm; ova­ 1863.—"Habitat planities calidas siccas septentrio- ry puberulent but glabrate soon after fertiliza­ , nales Columbiae... ."—Holotypus. Karsten s.n. from tion; ovules 6-12. Pod in profile narrowly linear "Coro. Sta. Marta." W! attenuate at both ends, 6-16 x ±0.25 cm, gently M. nisra J. Huber, Bull. Herb. Boissier II. 1: 303. constricted between seeds and hence submoni- 1901.—"[Bjaz'il, Ceara:] Depressions humides dans le Sertao, prcs Quixada (309)."—Holotypus, collect­ liform, obtusely tetragonal and a little laterally ed in Oct 1897, labeled 'M. acutifolia var. nigra', compressed, the smooth dilated convex replum MG! 2-2.5 mm wide, the firm, almost plane, reticu- M. limana Rizzini, Leandra 4-5: 14, est. 12. 1974.— lately venulose valves ± 1.5 mm wide, when ripe "Vivit in caatinga ad Senhor de Bomfim. Bahia, coll. D. P. Lima 13.147. (16-V-73). Holotypus in RB no. separating from replum and breaking into nar­ 148.275."-Holotypus, RB! rowly ellipsoid free-falling dehiscent articles 9- M. maracasensis Harms in herb., nom. ined. —Mara- 13 mm long; seeds vertically basipetal, ellipsoid cas, Bahia, IX. 1906, Ule 8956, G! HAMB! K! ±7 x 2.5 mm, the testa dull black. M. cabrera sensu Bentham. 1876: 416. M. tenuiflora sensu Lewis, 1937, fig. 8E (pod). In seasonally dry woodland near 200 m, ap­ parently rare, known only from the e. slope of Often vulnerantly prickly, microphyllidious the upper Paraguai basin in Mato Grosso do Sul arborescent shrubs and trees commonly 2-5 m (Fda. Sta. Cruz). Brazil and immediately adj. with stiff knotty fuscous, livid or blackish Paraguay (confluence of rios Apa and Perdi- branches erratically armed with stout subhori- 136 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [VOL. 65 zontal castaneous or livid aculei 2-10 mm arising ing stramineous or brownish, bullateiy elevated from a broad swollen pediment, the sometimes over each seed, viscid with both sessile and short- unarmed homotinous branchlets and foliage pu- stipitate glands, when ripe separating from rep­ berulent and ± resinous or viscid with minute lum and breaking up into articles ±6-8 mm long; soft hairs 0.1-0.3 mm and mostly sessile or semi- seeds in broad profile obovate-subcordate ±4- immersed, but on some stems partly short-stip- 4.5 x 3.3 mm. the testa dull brown. itate glands ±0.05-0.1 mm diam., the plane firm An element of brush-woodland communities lfts subconcolorous, dull olivaceous often brun- subject to periodic or seasonal drought, in Brazil nescent when dry, facially either glabrous or fine­ mostly in caatinga but entering cerrado and oc­ ly puberulent, dorsally sprinkled with semi- casional on sandstone outcrops, in places form­ immersed glands, often minutely ciliolate, the ing weedy thickets in pastures and along high­ fl-spikes from axils of fully expanded or already ways, in n. South America in semideciduous fallen lvs, the inflorescence in consequence either forest and chaparral, mostly below 500 m but in immersed in foliage or on defoliate annotinous Bahia attaining 750(-900) m, discontinuously branchlets. Stipules deltate, triangular or trian­ dispersed in tropical North and South America: gular-acuminate (0.5-) 1-2.5 mm, deciduous. n.-e. Brazil in lat. 4-15°S, locally abundant from Leaf-stalks (2-)2.5-6.5(-9.5) cm, the petiole in­ Ceara and Rio Grande do Norte to s.-e. Piaui cluding livid pulvinus 7-14 mm, at middle 0.5- and interior Bahia, there reaching the Contas val­ 0.9 mm diam., the longer interpinnal segments ley e. of the central highlands and in the S. Fran­ (3—)4—9(— 11) mm, the ventral groove interrupted cisco basin extending to Espigao Mestre and the between pinnae by a spicule 0.3-1 mm: pinnae frontier of Minas Gerais, perhaps disjunct (pend­ in Brazil 4—7-, n.-ward to 11-jug., decrescent ing confirmation) in far e. S. Paulo (Campos da proximally, the rachis of longer ones (2-)2.5-5 Bocaina. leg. Glaziou, P!), interior Venezuela (-5.5) cm, the longer interfoliolar segments 1-2.2 (Zulia, Cojedes, Guarico. Lara, Aragua) and the (-2.5) mm; lfts of longer pinnae (15-) 17-3 3 Guajira Peninsula in n.-e. Colombia; arid valleys (—40)-jug., decrescent only near ends of rachis, of the Pacific slope in El Salvador and Honduras; in outline linear-oblong obtuse or sometimes mi­ Pacific lowlands of Oaxaca and Chiapas, Mexi-< nutely apiculate, the longer ones (3.5-)4-8 x 1- co. —Fl. in Brazil irregularly throughout the year, 1.6 mm, 2,5-5 times as long as wide, faintly l(-2)- in Venezuela mostly X-II(-V). — Carbonal. cd^" nerved dorsally, the upper face veinless. Spikes brera, cuji cabrera (Venezuela-Colombia); jure- solitary or sometimes geminate, subsessile, in ma, j. preta (Brazil); tepescohuite (Mexico). young bud appearing as dense cylindric aments Map 5. ±5-10 x 2-3 mm, the axis becoming 4-10 cm, A syndrome of viscid foliage, strongly 4-ribbed loosely spicate; bracts cuneate-spatulate 0.6- calyx with incurved lobes, and a stipitate thin- 1 mm, at dilated apex hooded and dorsally pu­ walled pod charged with mixed sessile and stip­ berulent; fl-buds oblong-obovoid. minutely glan­ itate glands, the valves bullateiy distended over dular-papillate distally; flowers 4-merous 8-an- the seeds, neatly defines this widespread species. drous, some often staminate; calyx turbinate- The Brazilian populations, which were ascribed-] campanulate 0.75-1 mm, 4-angulate by promi­ by Bentham to an endemic species, M. hostilis. nent ribs leading to the very short, cucullately differ only very slightly from those of Venezuela incurved, dorsally puberulent lobes; corolla tur­ by leaves on the average a little shorter and com­ binate 2.1-3.1 mm, whitish or greenish-white, posed of fewer (mostly 4-7, not 6-11) pairs of the ovate, apically callous and incurved lobes pinnae; but some individual plants from these 0.7-1.6 mm; filaments white, free, the longer ones widely disjunct areas are nevertheless identical^ exserted 3-4 mm; ovary gray-pilosulous laterally in foliage. Stipitate glands are perhaps more fre­ and glandular-verruculose overall. Pods narrow­ quent north than south of the Equator, but are ly oblong or oblong-elliptic in profile, when well imperfectly correlated with dispersal. fertilized 25-50 x 6-8.5 mm, 4-6-seeded, the I In recent years tepescohuite has received sen­ body cuneately contracted at base into a slender sational publicity as a miracle drug in the treat- stipe 2-4 mm, the shallowly undulate replum 'ment of burns.
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