Deyeuxia abnormis, Hooker, 1896

Paszko, Beata & Soreng, Robert J., 2013, Species delimitation and name application in Deyeuxia abnormis, Agrostis zenkeri, A. pleiophylla and related taxa (Poaceae: Agrostidinae), Phytotaxa 111 (1), pp. 1-26 : 5-6

Key to Deyeuxia abnormis and its allies

1. Absence of rachilla extension in the spikelet; callus hairs 0.0– 0.4 mm, 0.0–0.2 × length of lemma........................... 2

- Presence of rachilla extension in the spikelet; callus hairs 0.6–2.9 mm, 0.3–1.0 × length of lemma ......................... 3

2. Palea 0.8–1.5 mm, 0.5–0.7 × length of lemma .............................................................. Agrostis gigantea (not treated)

- Palea 0.6–1.0 mm, 0.3–0.4 × length of lemma ............................................................................ 3. Agrostis pleiophyla

3. Palea ca. 2.7 mm long, as long as or slightly longer than lemma; anthers ca 1.2 mm; callus hairs ca. 1 mm; plants of southern India.................................................................................................................................. 4. Agrostis zenkeri

- Palea 1.2–1.8 mm long, conspicuously shorter than lemma, 0.5–0.8 × length of lemma; mountains of Nepal, Bhutan, NE India to SW China.................................................................................................................................................. 4

4. Spikelets 1.9–2.5(–3) mm; callus hairs 0.6–1.0 mm, 0.25–0.50 × length of lemma, hairs usually not visible between glumes; lemmas awnless or with short mucro ca. 0.15 mm inserted subapically .......................1. Deyeuxia abnormis

- Spikelets 2.2–4.2 mm; callus hairs 1.3–2.9 mm long, 0.6–1.0 × length of lemma, hairs usually visible between glumes; lemmas nearly always awnless........................................................................................................................ 5

5. Palea 0.50–0.74 × length of lemma ................................................................................................. 2. Deyeuxia diffusa

- Palea 0.40–0.43 × length of lemma ............................................................................................... 5. Deyeuxia flaccida