| 1 |
Lemma awnless; panicle open |
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(2) |
| + |
Lemma awned; panicle open or contracted |
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(6) |
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| 2 (1) |
Callus hairs 2/3 as long as lemma or more; culms up to 120 cm; panicle 15–30 cm |
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(3) |
| + |
Callus hairs not more than 1/2 as long as lemma; culms up to 60 cm; panicle 6–12 cm |
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(4) |
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| 3 (2) |
Spikelets 2–3 mm; lemma 1.5–2.5 mm; callus hairs equaling or subequaling lemma. |
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1 D. diffusa |
| + |
Spikelets 3–4.2 mm; lemma 3–4 mm; callus hairs 2/3–4/5 as long as lemma. |
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2 D. flaccida |
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| 4 (2) |
Spikelets 3–3.7 mm; rachilla 1.5–2.5 mm; anthers ca. 2 mm. |
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3 D. yanyuanensis |
| + |
Spikelets 2–2.5 mm; rachilla ca. 0.6 mm; anthers ca. 0.5 mm |
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(5) |
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| 5 (4) |
Spikelets 1.9–2.5(–3) mm; glumes slightly shorter than floret; callus hairs less than 1 mm, not visible between glumes; leaf sheaths smooth. |
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4 D. petelotii |
| + |
Spikelets 2.5–3.5 mm; glumes equaling or longer than floret; callus hairs 1.2–2 mm, visible between glumes; leaf sheaths scabrid |
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5 D. abnormis |
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| 6 (1) |
Callus hairs less than 1/2 as long as lemma |
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(7) |
| + |
Callus hairs 1/2 as long as lemma or longer |
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(19) |
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| 7 (6) |
Awn arising near or above middle of lemma |
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(8) |
| + |
Awn arising from below middle of lemma |
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(12) |
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| 8 (7) |
Spikelets with 2 florets. |
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6 D. himalaica |
| + |
Spikelets with 1 floret |
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(9) |
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| 9 (8) |
Plant with slender, elongate, creeping rhizomes |
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(10) |
| + |
Plant tufted or shortly rhizomatous |
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(11) |
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| 10 (9) |
Awn 1–2.5(–6) mm, arising from upper 1/3 of lemma or above; glumes scabrid. |
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7 D. pulchella |
| + |
Awn 5–6 mm, arising from middle of lemma; glumes smooth or scabrid only on keel. |
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8 D. rosea |
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| 11 (9) |
Panicle contracted, branches straight, scabrid; lower glume ciliolate on margins; anthers 2–3 mm. |
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9 D. scabrescens |
| + |
Panicle open, branches capillary, curving, smooth; lower glume not ciliolate on margins; anthers ca. 1 mm. |
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10 D. nyingchiensis |
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| 12 (7) |
Panicle loosely contracted to dense, sometimes spikelike |
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(13) |
| + |
Panicle open with spreading branches, (5–)15–35 cm wide |
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(16) |
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| 13 (12) |
Anthers 0.5–1.2 mm; culms 1–2-noded. |
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11 D. nivicola |
| + |
Anthers 2–3 mm; culms (2–)3–5-noded |
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(14) |
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| 14 (13) |
Glumes membranous, shining. |
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25 D. anthoxanthoides |
| + |
Glumes not shining |
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(15) |
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| 15 (14) |
Leaf blades involute, filiform; spikelets 4–5.5 mm. |
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12 D. mazzettii |
| + |
Leaf blades flat, stiff; spikelets 5–7 mm. |
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14 D. korotkyi |
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| 16 (12) |
Callus hairs less than 1/5 length of lemma; ligule 0.5–2(–4) mm |
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(17) |
| + |
Callus hairs 1/5–2/5 length of lemma; ligule 2.5–20 mm |
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(18) |
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| 17 (16) |
Plant ca. 65 cm tall; panicle 5–9(–16) cm; spikelets with 1(–2) florets. |
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15 D. suizanensis |
| + |
Plant 80–120 cm tall; panicle 20–35 cm; spikelets with 1 floret. |
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16 D. effusiflora |
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| 18 (16) |
Lemma apex erose; anthers (1.3–)2–3 mm. |
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17 D. pyramidalis |
| + |
Lemma apex with 0.5–1.5 mm mucros; anthers 0.5–1.2 mm. |
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13 D. flavens |
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| 19 (6) |
Panicle open or slightly contracted |
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(20) |
| + |
Panicle dense, often spikelike |
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(24) |
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| 20 (19) |
Panicle branches usually paired; glumes smooth, scabrid on keel only; ligule 1–1.5 mm. |
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18 D. hakonensis |
| + |
Panicle branches fascicled; glumes scabrid; ligule 3–20 mm |
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(21) |
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| 21 (20) |
Awn sub-basal. |
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19 D. sinelatior |
| + |
Awn arising near or above middle of lemma |
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(22) |
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| 22 (21) |
Culms (4–)6–8-noded, usually branched. |
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20 D. purpurea |
| + |
Culms 2–4-noded, unbranched |
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(23) |
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| 23 (22) |
Lemma awned from near middle; awn ca. 1.2 mm, not exserted from spikelets. |
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21 D. sichuanensis |
| + |
Lemma awned from near apex; awn 3–6 mm, exserted from spikelet. |
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22 D. nepalensis |
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| 24 (19) |
Awn geniculate with twisted column, conspicuously exceeding glumes |
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(25) |
| + |
Awn slender, straight, slightly curved or indistinctly twisted in lower part, included within glumes (exserted in D. moupinensis) |
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(27) |
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| 25 (24) |
Culm densely pubescent below panicle; panicle branches pubescent. |
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26 D. tibetica |
| + |
Culms scabrid below panicle; panicle branches scabrid |
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(26) |
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| 26 (25) |
Anthers 1.5–2 mm; spikelets 4–6 mm, purple. |
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27 D. tianschanica |
| + |
Anthers 2–4 mm; spikelets 5–9 mm, yellowish brown, purplish at base. |
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28 D. holciformis |
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| 27 (24) |
Lemma apex deeply 2-lobed; awn arising from between lobes; ligule ca. 0.5 mm. |
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29 D. moupinensis |
| + |
Lemma apex denticulate or minutely 4-toothed; ligule 1.5–7 mm |
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(28) |
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| 28 (27) |
Anthers ca. 0.5 mm; culms 15–45 cm tall. |
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30 D. debilis |
| + |
Anthers 1.5–2.2 mm |
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(29) |
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| 29 (28) |
Awn arising from lower 1/3 of lemma or slightly above |
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(30) |
| + |
Awn sub-basal |
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(32) |
| |
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| 30 (29) |
Awn poorly developed, 1–2 mm; spikelets 3–4 mm. |
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23 D. neglecta |
| + |
Awn 3–6 mm; spikelets 4–7 mm |
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(31) |
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| 31 (30) |
Panicle 10–25 cm; glumes subequal. |
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24 D. lapponica |
| + |
Panicle 5–8 cm; glumes unequal. |
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31 D. zangxiensis |
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| 32 (29) |
Callus hairs equal to or slightly longer than lemma. |
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32 D. conferta |
| + |
Callus hairs 1/2–4/5 as long as lemma |
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(33) |
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| 33 (32) |
Leaf sheaths scabrid; spikelets purple with bronze at apex. |
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33 D. kokonorica |
| + |
Leaf sheaths smooth; spikelets yellowish green or pinkish. |
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34 D. macilenta |
