| 1 |
Spikelets (3 or)4–6 per node |
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(2) |
| + |
Spikelets 1–3(or 4) per node |
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(5) |
| |
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| 2 (1) |
Spikelets with 3–5 florets; first lemma 15–20 mm. |
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1 L. racemosus |
| + |
Spikelets with 5–10 florets; first lemma 8–13 mm |
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(3) |
| |
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| 3 (2) |
Leaf blade 5–15 × 0.5–0.8 cm; spike oblong-ovate, 5–9 cm. |
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4 L. ovatus |
| + |
Leaf blade 15–42 cm; spike linear, 12–25 cm |
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(4) |
| |
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| 4 (3) |
Glumes 3-veined, unequal, proximal one 10–12 mm, distal one 13–16 mm; spikelets 3–5 per node. |
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2 L. pseudoracemosus |
| + |
Glumes 1-veined, subequal, 10–13 mm; spikelets 4–6(–11) per node. |
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3 L. crassiusculus |
| |
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| 5 (1) |
Spikelets usually 1 per node, rarely 2 or 3 per node below middle of spike |
|
(6) |
| + |
Spikelets 1–3(or 4) per node |
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(12) |
| |
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|
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| 6 (5) |
Glumes lanceolate or linear-lanceolate, 3-veined |
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(7) |
| + |
Glumes subulate-linear or narrowly lanceolate, veinless or 1-veined |
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(9) |
| |
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| 7 (6) |
Palea much shorter than lemma, apex emarginate; spikelets with 2 or 3 florets. |
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18 L. pishanicus |
| + |
Palea slightly shorter than or equaling lemma; spikelets with 4–8 florets |
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(8) |
| |
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|
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| 8 (7) |
Glumes 10–15 mm, margin membranous and ciliate. |
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19 L. altus |
| + |
Glumes 6–7.5 mm, margin membranous but not not ciliate. |
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20 L. obvipodus |
| |
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| 9 (6) |
Lemma puberulent, or if smooth and glabrous then margin ciliate; leaf blade 0.1–0.3 cm wide. |
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21 L. ruoqiangensis |
| + |
Lemma smooth, glabrous; leaf blade 0.2–2.5 cm wide |
|
(10) |
| |
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|
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| 10 (9) |
Leaf blade to 2.5 cm wide; glumes subulate-linear. |
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23 L. aemulans |
| + |
Leaf blade 0.2–0.6 cm wide, glumes linear-lanceolate |
|
(11) |
| |
|
|
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| 11 (10) |
Spikelets with 3 or 4 florets. |
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22 L. arjinshanicus |
| + |
Spikelets with 4–7 florets. |
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24 L. ramosus |
| |
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| 12 (5) |
Glumes equaling or slightly longer than spikelet |
|
(13) |
| + |
Glumes shorter than spikelet |
|
(16) |
| |
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| 13 (12) |
Glumes wholly covering lemma or covering only base of first lemma |
|
(14) |
| + |
Glumes not covering lemma |
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(15) |
| |
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|
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| 14 (13) |
Spikelets 2 per node; glumes wholly covering lemma. |
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10 L. karelinii |
| + |
Spikelets (1 or)2 or 3 per node; glumes covering only base of first lemma. |
|
11 L. mollis |
| |
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|
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| 15 (13) |
Ligule ca. 0.5 mm; rachis internodes 3–6 mm. |
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12 L. paboanus |
| + |
Ligule 2–3 mm; rachis internodes 6–20 mm. |
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13 L. tianschanicus |
| |
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|
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| 16 (12) |
Glumes oblong-lanceolate, apex with awn 4–5 mm. |
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5 L. aristiglumis |
| + |
Glumes not as above |
|
(17) |
| |
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|
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| 17 (16) |
Glumes covering base of first lemma |
|
(18) |
| + |
Glumes not covering base of first lemma |
|
(21) |
| |
|
|
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| 18 (17) |
First lemma 7–9 mm including apical point |
|
(19) |
| + |
First lemma 10–14 mm |
|
(20) |
| |
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| 19 (18) |
Culms 14–35 cm tall; glumes narrowly lanceolate, 5–9 mm, margin not ciliate. |
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7 L. yiunensis |
| + |
Culms 60–150 cm tall; glumes linear-lanceolate, 9–11 mm, distal margin sparsely ciliate. |
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8 L. pendulus |
| |
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| 20 (18) |
Spikelets with 2 or 3 florets. |
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6 L. angustus |
| + |
Spikelets with 5–9 florets. |
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9 L. shanxiensis |
| |
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| 21 (17) |
Glumes 3-veined; palea equaling lemma |
|
(22) |
| + |
Glumes 1-veined or nearly veinless; palea shorter than or subequaling lemma |
|
(23) |
| |
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| 22 (21) |
Callus of lemma villous; glumes linear-lanceolate. |
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15 L. secalinus |
| + |
Callus of lemma smooth; glumes subulate. |
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16 L. chinensis |
| |
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| 23 (21) |
Callus of lemma puberulent; palea shorter than lemma; first lemma 5–8 mm. |
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14 L. multicaulis |
| + |
Callus of lemma villous; palea subequaling lemma; first lemma 9–10 mm. |
|
17 L. flexus |
