Eriochrysis species

Welker, Cassiano Aimberê Dorneles, Longhi-Wagner, Hilda Maria & Souza-Chies, Tatiana Teixeira De, 2012, New record for Eriochrysis (Poaceae: Andropogoneae) in the State of Rio Grande do Sul, Brazil, and a key to the species of Eriochrysis in Brazil, Phytotaxa 71 (1), pp. 1-4 : 3

Key to the Eriochrysis species in Brazil

1. Pair of spikelets consisting of two pedicelled spikelets, one short- and the other long-pedicelled ( Fig. 1B ) ................ ..................................................................................................................................................................... E. filiformis

- Pair of spikelets consisting of one sessile and one pedicelled spikelet ( Fig. 1F ) ......................................................... 2

2. Inflorescence sparsely pilose; spikelets clearly visible among the trichomes ( Fig. 1E )............................................... 3

- Inflorescence densely pilose; spikelets hidden among the trichomes........................................................................... 5

3. Sessile spikelet obovate, lower glume with the apex rounded to obtuse ( Fig. 1G ) ............................................ E. laxa

- Sessile spikelet lanceolate to elliptic, lower glume with the apex acute or acuminate ( Fig. 1C, 1K ) ......................... 4

4. Inflorescence 5–14 cm long, contracted, racemes adpressed .................................................................... E. holcoides

- Inflorescence 17–30 cm long, subcontracted to slightly open, racemes divergent especially at the base of the inflorescence ........................................................................................................................................ E. warmingiana

5. Lower glume of sessile spikelet with the apex truncate, trilobed ( Fig. 1A ); sessile spikelet 1.8–3.5 mm long ........... ................................................................................................................................................................ E. cayennensis

- Lower glume of sessile spikelet with the apex acute to subacute, not lobed ( Fig. 1I ) or with inconspicuous lobes ( Fig. 1J ); sessile spikelet 3–5 mm long .......................................................................................................... E. villosa

Figures

FIGURE 1. Morphological details of the Eriochrysis species. A. E. cayennensis, lower glume of the sessile spikelet (Longhi-Wagner & Welker 10781, ICN). B. E. filiformis, pair of spikelets (Câmara & Filgueiras 30, ICN). C. E. holcoides, lower glume of the sessile spikelet (Longhi-Wagner & Welker 10731, ICN). D–G. E. laxa (Welker 489, ICN). D. habit. E. inflorescence. F. pair of spikelets. G. lower glume of the sessile spikelet. H. E. aff. laxa, lower glume of the sessile spikelet (Welker 487, ICN). I–J. E. villosa. I. lower glume of the sessile spikelet (Welker 328, ICN). J. lower glume of the sessile spikelet (Welker 182, ICN). K. E. warmingiana, lower glume of the sessile spikelet (Filgueiras 1902, ICN). Illustrations by Anelise Scherer and Cassiano A. D. Welker.