Mimosa farinosa Griseb.
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Authors
Rupert C. Barneby
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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.
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Family
Mimosaceae
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Scientific Name
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Type
114. Mimosa farinosa Grisebach, Pl. lorentz. 86 [Abh. konigl. Ges. Wiss. Gottingen 19: 134]. 1874 —"[Lorentz] 265 ... Catamarca, frequens in sepibus et fruticetis pr. Fuerte de Andagala."—Holotypus, presumably at GOET, not seen; Lorentz 343 and 645 at COR
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Description
Species Description - Stiffly branched deciduous microphyllous shrubs and treelets attaining 3 m with trunks to ± 1 dm diam., pungently armed near some or all nodes with (1 or) a pair of immediately infrastipular, straight ascending aculei 1-3 mm, the annotinous branches purplish-brown glabrate, the homotinous ones with lvs and peduncles minutely pilosulous and charged with livid (rarely pallid) globose, sessile or substipitate glands 0.1-0.3 mm diam., the foliage green subconcolorous, the lfts puberulent on both faces or only beneath and charged beneath, either around margin or overall, with sessile glands, the globose capitula solitary or to 4 together from brachyblasts, either accompanied or not by coeval lvs. Stipules erect subulate 0.3-1 mm puberulent, deciduous. Leafstalks including slender pulvinus (1.5-)2-6 x 0.30.5 mm, the open ventral groove not terminating in a spicule; pinnae 1-jug., the rachis 5—13(—16.5) mm, the longer interfoliolar segments 0.7-1.7 mm; lfts (5—)6—1 l(-12)-jug., scarcely graduated, the first pair 0.3-1 mm distant from declined subulate paraphyllidia 0.2-0.5 mm, the blades oblong or elliptic-obovate from bluntly auriculate base, obtuse or deltately subacute at apex, the larger ones (2.2-)2.5-4.5 x 0.8-1.7 mm, 2.3-4 times as long as wide, all veinless above, weakly (2-) 3-nerved dorsally, the simple midrib displaced to divide blade ±1:2, the inner posterior nerve produced well beyond mid-blade, the outer ones much shorter or obsolescent. Peduncles subcapillary 4-21 mm; capitula without filaments 4.5-5 mm diam., prior to anthesis moriform, the obtuse fl-buds puberulent and minutely glandular; bracts linear-oblanceolate or -spatulate 0.7-1.2 x 0.2-0.4 mm, dorsally puberulent, caducous; flowers 4-merous 8-androus, all bisexual, the lowest in a capitulum sometimes smaller than the rest; calyx submembranous often brownish 0.5-0.7 mm, the erect triangular teeth ±0.2 mm, puberulent and often minutely granular; corolla greenish-white puberulent and livid-granular 2.3-3.2 mm, the ovate, almost plane or at tip shallowly hooded lobes 0.8-1.3 x 0.7-0.9 mm; filaments white, united below ovary into a stemonozone 0.2-0.4 mm, exserted 3.3-4.6 mm. Pods commonly 1-3 per capitulum stipitate, the stipe (0.5-) 1.5—4 mm, the linear, straight or gently curved, piano-compressed body 22-50(-55) x (4-)4.5-7.5 mm, (3-)4-7(-8)-seeded, the shallowly undulate-constricted replum 0.4-0.6 mm wide, the papery, brown or nigrescent, puberulent and granular, finely venulose valves low-colliculate over each seed, when ripe separating from replum and breaking up into free-falling indehiscent articles 4-7 mm long; seeds lentiform ±3.5-4 x 2.5-3 mm, the fuscous-olivaceous testa smooth.
Distribution and Ecology - On dry hillsides and in barrancas below 1500 m along the foothills of the Andes and the pre-Andean ranges of Argentina n.-ward from ± 32°S in Córdoba to Jujuy, mostly extratropical, but collected once in spiny chaparral at 1240 m in valley of río Mizque in prov. Florida of depto. Sta. Cruz, Bolivia, to be expected in intervening Chuquisaca and Tarija.—Fl. IX-V, sometimes from defoliate branchlets. — Cinqui (and variants); churqui; teatín; tusca blanca.
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Discussion
The Cinqui is superficially similar to M. detinens in small leaves consisting of a single pair of pinnae, but differs consistently in straight ascending, immediately infrastipular aculei, erect calyx-teeth, and much narrower, puberulent and granular, not smooth and glabrous pod. While M. detinens is characteristic of the Chaco thorn-forest, the habitat of M. farinosa is along the Andean piedmont. The two species are not known to overlap in range, but in Argentina are closely vicariant.
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Distribution
Argentina South America| Córdoba Argentina South America| Bolivia South America| Santa Cruz Bolivia South America|