Mimosa calliandroides

  • Title

    Mimosa calliandroides

  • Author(s)

    Rupert C. Barneby

  • Scientific Name

    Mimosa calliandroides Hoehne

  • Description

    282. Mimosa calliandroides Hoehne, Com. lin. telegr., Bot. 12: 8, t. 183. 1922.-"No. 2025, Kuhlmann, Pouso [Primeiro] de Fevreiro, margens do Cautario, Rondônia, noroeste de Matto-Grosso [±64°W, 12°S], em Fevreiro de 1919."—Holotypus, SP (?, not seen); isotypus, RB! = NY Neg. 12244.

    Slender erect unarmed, amply microphyllidious subshrubs attaining ± 1(-?) m, the stems with lf- and inflorescence axes charged with lanceolate or triangular, dorsiventrally compressed scalelike trichomes (setae) to 0.7-1.5 mm, wholly eglandular, the small crowded lfts glabrous subconcolorous, the inflorescence an efoliate or proximally few-lvd panicle of small globose capitula rising ±1-2 dm above foliage. Stipules firm erect, triangular or lance-acuminate 1.5-4 x 0.7-1.5 mm, striately several-nerved, persistent. Leaf-stalks 3-10 cm, the petiole including hard pulvinus 2-4 mm, the longer interpinnal segments 5-10 mm, the narrow shallow ventral sulcus bridged between each pinna-pair and there charged with a lanceolate subherbaceous spicule 1-1.5 mm; pinnae of larger lvs 7-14-jug., the axis of longer ones 2.5-3.3 cm, the interfoliolar segments 0.3-0.5 mm; lfts of longer pinnae 35-50- jug., subvertically imbricate, the blades linear obtuse or subapiculate, the larger ones 2.5-4.5 x 0.5-0.8 mm, 4.3-6.4 times as long as wide, all veinless above, beneath faintly 4-5-nerved from pulvinule, the subcentric midrib 1-2 branched near and above middle, the inner posterior and inner anterior nerves produced beyond mid-blade, the 1-2 outer ones much shorter. Peduncles solitary or 2-5 per node, 6-16 mm; capitula without filaments 4.5-5.5 mm diam., prior to anthesis moriform, the ellipsoid obtuse fl-buds either glabrous or minutely puberulent; bracts ovate or lanceolate 0.35-0.7 mm, flowers 4-merous 8-androus, some lower ones often staminate; calyx campanulate 0.5-0.7 mm, finely ± 16-nerved, the minutely denticulate and cilio orifice often a little oblique; corolla turbinate, proximally attenuate, 2.2-3 mm, the firm lance-ovate lobes 1.3-1.8 x 0.7-0.9 mm, at middle 6-7-nerved; filaments lilac-pink, at base united into a stemonozone 0.3-0.5 mm, exserted 4-6 mm. Pods stiffly ascending, 1-5 per capitulum, in profile undulately linear, straight, attenuate at base but not truly stipitate, abruptly short-beaked, the longer ones 30-50 x 3.5-4 mm, 7-10-seeded, the shallowly constricted replum 0.50.6 mm diam., the replum and stiffly papery valves alike densely strigose overall with appressed setulae to 0.4-1 mm, the valves bullately elevated over each seed, when ripe breaking up into free-falling biconvex articles 4.5-5.5 mm long.

    In savanna below 350 m, apparently local in the upper Madeira-Mamoré basin in s.-e. Amazonas (mun. Humaitá) and Terr, de Rondônia (Guajará-mirim; rio Cautario), Brazil.—Fl. II- VI. Map 42.

    Among immediate relatives of M. somnians with striate corolla-lobes M. calliandroides is well distinguished by the squamiform basifixed setae of the stems and by dispersal in southwestern Amazonia.