Monographs Details: Mimosa glycyrrhizoides 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
Description:Species Description - Slender, openly branched microphyllidious shrubs 10-15 dm, randomly armed on infrastipular ribs of stem, near and well below nodes, and on back of some lf-stks with erect, straight or distally retro-arcuate, broad-based stramineous aculei 1-6.5 mm, the young growth thinly glandular-verruculose and minutely puberulent, the foliage concolorous, the thick-textured olivaceous lfts glabrous facially, gland-dotted dorsally, minutely ciliolate, the globose capitula axillary, the fruits lateral below new leafy growth. Stipules ascending or sometimes reflexed (but not involute) in age, ovate or elliptic-ovate obtuse 0.7-1.5 x 0.7-1 mm, persistent. Leaf-stalks (1.5-)2-4.5 cm, the petiole (6-)7-16 x 0.6-0.8 mm, the longer interpinnal segments (4-)5-10 mm, the pinnae seldom exactly opposite, the ventral sulcus continuous between them; pinnae 2-5-jug., accrescent distally, the rachis of furthest pair (1.6-) 2-3 cm, the longer interfoliolar segments 1-1.7 mm; lfts of distal pinnae (14-) 16- 20(-2 l)-jug., decrescent at each end of rachis, the first pair 0.7-1.2 mm distant from ovate-suborbicular or reniform green paraphyllidia 0.3-0.6 x 0.3-0.7 mm, the blades rhombic-oblong or elliptic from deltately auriculate base, obtuse at apex, those near mid-rachis (1.5-) 1.7-3.3 x 0.8-1.5 mm, ±2-2.6 times as long as wide, all veinless above, beneath weakly 2-3-nerved from pulvinule, the midrib a little forwardly displaced, straight or almost so, the posterior nerve(s) expiring within the plane margin. Peduncles solitary and 2-3 together 6-13 mm, divaricate in fruit; capitula globose, without filaments ±4.5 mm diam., prior to anthesis moriform, the receptacle 1.5-2 x 0.8-1.2 mm; bracts 1.5-2 x 0.4-0.6 mm, deciduous; calyx campanulate 0.7-0.8 mm, shallowly deltate-denticulate, minutely puberulent externally; corolla narrowly campanulate ±2-2.2 mm, the ovate 1-nerved, shallowly concave lobes 0.5-0.7 x 0.5-0.6 mm, minutely puberulent and viscid-villosulous dorsally; filaments (presumably pink) free to base, exserted 2-2.5 mm. Pods 1-3 per capitulum, in profile undulately linear, gradually contracted at base into a stipe 1.5-4 mm, cuspidate at apex, when well fertilized 20-35 x 3-4 mm, 3-8-seeded, the constricted replum 0.35-0.6 mm diam., together with papery valves hispid overall with straight erect compressed stramineous, partly plain and partly gland-tipped setae 1-4 mm, the valves finally breaking up into elliptic or oblong-elliptic, free-falling, individually dehiscent articles (3.5-)4-6 mm long; seeds basipetal, compressed-obovoid ±3 x 2.2 mm, the golden-brown testa smooth sublustrous.

Distribution and Ecology - At edge of campo or in thickets, apparently local, near 1000 m in upper basin of rio Iguaçú in s.-centr. Paraná (mun. Guarapuava and Palmas, lat. ±25°-26°30'S), and at ±400 m in basin of rio Ibicuí in w. Rio Grande do Sul (near 29°30'S), in extratropical Brazil.—Fl. IX-X(-?), fr. X-XII.

Discussion:

Mimosa glycyrrhizoides might rationally be interpreted as an armed variant of M. bifurca, with which it agrees in leaf-formula and especially in gland-dotted leaflets arising alternately along the pinna-rachis. It differs, however, not merely in aculeate stems and leaf-stalks but also in the densely hispid and glandular-hispid, elongately burrlike pods, strikingly different from the smooth, merely resin-spotted pod characteristic of all known forms of M. bifurca. The coincidence of glandular-verruculose foliage with a hispid pod recalling that of Glycyrrhiza lepidota Nutt. suggested the epithet.

Distribution:Brazil South America| Rio Grande do Sul Brazil South America| ParanĂ¡ Brazil South America|