Schizachyrium glaziovii, Peichoto, 2010

Dorneles Welker, Cassiano A. & Peichoto, Myriam Carolina, 2015, Considerations on the genus Schizachyrium (Poaceae-Andropogoneae) in Central America and West Indies, and confirmation of the occurrence of S. glaziovii, Phytotaxa 201 (1), pp. 87-95 : 93

Key to distinguish Schizachyrium glaziovii from morphologically similar species from Central America and West Indies

1. Inflorescence corymb-like, congested to subcongested ( Fig. 2B ); spatheole 11–18(–20) mm long; awn of the sessile spikelet 7–10(–11) mm long ..................................................................................................................................................... S. condensatum

- Inflorescence panicle-like, open to narrowly oblong ( Figs. 2D–E ); spatheole (18–) 20–28 mm long; awn of the sessile spikelet 11–17 mm long ..................................................................................................................................................................................2

2. Inflorescence wide, open to subcontracted ( Fig. 2E ); spatheole strongly convolute; peduncle 15–30 mm long, with the superior portion exserted at maturity ( Figs. 1I–J ); lower glume of the sessile spikelet 3.5–4.3(–4.5) mm long ................. S. microstachyum

- Inflorescence elongate, narrowly oblong ( Fig. 2D ); spatheole open; peduncle 3–10 mm long, included within the spatheole at maturity ( Figs. 1E–F ); lower glume of the sessile spikelet 4.5–5.5 mm long................................................................... S. glaziovii

Figures

FIGURE 1. Illustrations of the type materials of Schizachyrium glaziovii and morphologically similar species in Central America and West Indies.A–C. Schizachyrium condensatum (Humboldt & Bonpland s.n., P). A. inflorescence. B. raceme with the spatheole. C. pair of spikelets and rachis internode. D–G. Schizachyrium glaziovii (Glaziou 2739, P). D. inflorescence. E. raceme with the spatheole. F. open spatheole with the peduncle included within it. G. pair of spikelets and rachis internode. H–K. Schizachyrium microstachyum (Desvaux 8, P). H. inflorescence. I. raceme with the spatheole. J. convolute spatheole with the superior portion of the peduncle exserted at maturity. K. pair of spikelets and rachis internode. Illustrations by Liliana Gómez.

FIGURE 2. Photos of Schizachyrium glaziovii and morphologically similar species in the field. A–B. Schizachyrium condensatum (Longhi-Wagner & Welker 10757, ICN – Brazil). A. habit. B. inflorescence. C–D. Schizachyrium glaziovii (Longhi-Wagner & Welker 10577, ICN – Brazil). C. habit. D. inflorescence. E–F. Schizachyrium microstachyum (Welker 203, ICN – Brazil). E. inflorescence. F. habit. Photo credit: H.M. Longhi-Wagner (A–D), C.A.D. Welker (E, F).