Taxonomic Novelties in Andropogon (Poaceae-Andropogoneae) for Brazil

Abstract

Perenn,ial, caespitose; culms 34-64 cm tall, glabrous; 3 to 5 glabrous nodes. Leaf sheaths usually shorter than the internodes, glabrous; blades 3.517 x 0.05-0.2(-0.4) cm, linear, usually conduplicate, margins convolute or involute, apex acute or subobtuse, base straight, green on both faces, glabrous on abaxial face, puberulous on adaxial face, usually setose in the proximal portion, with marginal or submarginal hairs 2-5 mm long, apex scabrous on the margins; ZiguZe 0.2-0.6 mm long, membranous ciliate. ln,florescence 2.5-6 cm long, lax, elongated, usually composed of terminal, or both terminal and axillary inflorescence units, these units with 2 to 3(to 5) non-branched flowering branches, equal or subequal in length, conjugate or subdigitate, exserted or partially enclosed by the spatheole; peduncle of the inflorescence unit 8-19 cm long; spatheole 5.5-14 cm long. Pedicels and rachis internodes 2-3(4) mm long, linear, subequal in length, with hairs shorter than the sessile spikelet or as much as 1.5 times its length. Sessile spikelet 4.54.5 mm long, monoclinous, stramineousgreen; lower glum,e 4.5-6.5 x 0.S1 mm, slightly concave, lanceolate, bidentate, chartaceous, 4-nerved, without intercarinal nerves, without groove, scabrous on the upper third of the nerves, margins glabrous; upper glume 4.1-5 x 0.8-1.4 mm, acute or apiculate, chartaceous, 3-nerved, scabrous on the upper third of the central nerve, ciliate on the upper half of the margins; lower lemma 3.94.5 x 0.7-1 mm, hyaline or hyaline vinaceous, 2-nerved, ciliate on the upper half of the margins; palea absent; upper lemma 3-4 x 0.4-0.9 mm, perfect hyaline or stramineous hyaline, 3-nerved, glabrous or sparsely ciliate on the margins; apex bifid on the upper third or quarter, awned, awn 12-22 mm long; palea 1.2-2.8 x 0.3-0.7 mm, hyaline, ABSTRACT. Andropogon brasiliensis and A. monocladus, as well as a new variety, A. ingratus var. hirsutus from Brazil, are described. One new combination, A. bogotensis (Hackel) A. Zanin & Longhi-Wagner, is proposed. Morphological descriptions, illustrations, data on habitat, and geographical distribution are provided.