| 1 |
Florets unequal in size and of different texture; lower floret longer, flatter and more delicate |
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(2) |
| + |
Florets equal in size or nearly so and of similar texture |
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(4) |
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| 2 (1) |
Upper floret 1/2 length of lower floret; panicle eglandular. |
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1 I. hainanensis |
| + |
Upper floret slightly shorter and broader than lower floret; panicle glandular |
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(3) |
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| 3 (2) |
Perennial; culms to 80 cm tall, nodes glabrous; leaf blades narrowly lanceolate, 3–11 cm. |
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2 I. globosa |
| + |
Annual; culms to 25 cm tall, nodes hispid; leaf blades ovate-amplexicaul, 2–3 cm. |
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3 I. pulchella |
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| 4 (1) |
Spikelets 2 mm or more |
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(5) |
| + |
Spikelets less than 2 mm |
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(10) |
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| 5 (4) |
Panicle branches and pedicels glandular |
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(6) |
| + |
Panicle branches and pedicels eglandular |
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(8) |
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| 6 (5) |
Leaf sheaths longer than internodes; nodes pubescent; glumes truncate. |
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4 I. truncata |
| + |
Leaf sheaths shorter than internodes; nodes glabrous; glumes obtuse to rounded |
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(7) |
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| 7 (6) |
Leaf blades linear, 0.3–1 cm wide, suberect; panicle 5–14 cm; spikelets globose. |
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5 I. himalaica |
| + |
Leaf blades lanceolate, 0.8–1.8 cm wide, ascending; panicle 17–25 cm; spikelets elliptic to obovate. |
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6 I. hoi |
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| 8 (5) |
Lemmas densely ciliate along margins, otherwise glabrous; culms 30–60 cm tall. |
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7 I. ciliatiflora |
| + |
Lemmas not above; culms 5–25 cm tall |
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(9) |
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| 9 (8) |
Leaf blades ovate-lanceolate or lanceolate 1–1.8 cm wide; glumes densely scabrid-hispidulous, obtuse or subrounded. |
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8 I. repens |
| + |
Leaf blades narrowly lanceolate, 0.4–0.8 cm wide; glumes glabrous, subacute. |
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9 I. sikkimensis |
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| 10 (4) |
Culms up to 30 cm tall, often much less; plant decumbent or mat-forming |
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(11) |
| + |
Culms 30–100 cm tall, erect or ascending; plant tufted |
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(14) |
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| 11 (10) |
Leaf blades linear-lanceolate, 2–6 cm; pedicels often glandular. |
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10 I. clarkei |
| + |
Leaf blades lanceolate-ovate, 1–3.5 cm; pedicels eglandular |
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(12) |
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| 12 (11) |
Panicle branches and pedicels minutely scaberulous; leaf blades 2–3.5 cm, abruptly acuminate. |
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11 I. nipponensis |
| + |
Panicle branches and pedicels smooth; leaf blades 1–2 cm, acute |
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(13) |
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| 13 (12) |
Spikelets 1–1.4 mm; panicle with 15–30 spikelets (fewer in depauperate specimens) |
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12 I. myosotis |
| + |
Spikelets 1.4–2 mm; panicle sparse, usually with fewer than 12 spikelets. |
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13 I. pauciflora |
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| 14 (10) |
Panicle eglandular; spikelets 1–1.5 mm, whitish. |
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14 I. albens |
| + |
Panicle glandular (sometimes sparsely); spikelets 1.2–2 mm, green, purplish or brownish |
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(15) |
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| 15 (14) |
Leaf blades 1–2.5 cm, sheaths very short; panicle 1.5–4 cm, branches stiffly horizontal. |
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15 I. confusa |
| + |
Leaf blades 3–20 cm, sheaths not short; panicle 4–22 cm, branches ascending or spreading |
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(16) |
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| 16 (15) |
Leaf blades 3–10 × 0.4–0.8 cm; leaf sheaths glabrous (except margin) |
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(17) |
| + |
Leaf blades 9–20 × 1–2.4 cm; leaf sheaths hairy |
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(18) |
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| 17 (16) |
Glumes boat-shaped, usually glabrous, rarely hispidulous or scaberulous above middle; leaf sheaths shorter than internodes. |
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2 I. globosa |
| + |
Glumes ovate-elliptic, hirtellous above middle; leaf sheaths about as long or longer than internodes. |
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16 I. guangxiensis |
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| 18 (16) |
Leaf sheaths densely hirsute; leaf blades 9–12 × 1.3–2.4 cm. |
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17 I. sylvestris |
| + |
Leaf sheaths hispid with sharp patent hairs; leaf blades 12–20 × 1–1.2 cm. |
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18 I. scabrosa |
