| 1 |
Lemma hairy |
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(2) |
| + |
Lemma glabrous |
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(4) |
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| 2 (1) |
Spikelets 1.5–3 mm; palea almost equaling lemma. |
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1 A. munroana |
| + |
Spikelets 3–4 mm; palea clearly shorter than lemma |
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(3) |
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| 3 (2) |
Palea ca. 1/3 length of lemma; ligule 2.5–6 mm. |
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2 A. pilosula |
| + |
Palea ca. 2/3 length of lemma; ligule 1.5–2.5 mm. |
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3 A. dshungarica |
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| 4 (1) |
Palea well developed, more than 1/3 lemma length |
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(5) |
| + |
Palea small, 1/3 length of lemma or less, often tiny |
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(10) |
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| 5 (4) |
Culms up to 20 cm tall; alpine grass in Taiwan. |
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17 A. fukuyamae |
| + |
Culms up to 130 cm tall; not alpine grasses |
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(6) |
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| 6 (5) |
Anthers 0.5–0.8 mm; palea slightly under 1/2 lemma length. |
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16 A. arisan-montana |
| + |
Anthers 0.8–1.5 mm; palea 1/2–3/4 lemma length |
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(7) |
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| 7 (6) |
Plant stoloniferous, rhizomes absent; panicle contracted after anthesis. |
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4 A. stolonifera |
| + |
Plant tufted or rhizomatous, stolons absent; panicle open after anthesis |
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(8) |
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| 8 (7) |
Ligule on non-flowering shoots shorter than wide; panicle branches almost smooth; plants up to 70 cm. |
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5 A. capillaris |
| + |
Ligule on non-flowering shoots as long as or longer than wide; panicle branches scabrid; plants up to 150 cm |
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(9) |
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| 9 (8) |
Panicle green or violet tinged, branches moderately slender, branched from near base; floret callus shortly bearded, hairs 0.2–0.5 mm. |
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6 A. gigantea |
| + |
Panicle dark purple tinged brown, branches very fine, bare in lower 1/3; floret callus subglabrous. |
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7 A. divaricatissima |
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| 10 (4) |
Lemma awnless (occasionally a short awnlet present, included within the spikelet) |
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(11) |
| + |
Lemma awned, awn flexuous or geniculate, exserted from spikelet |
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(19) |
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| 11 (10) |
Panicle dense, spikelike, linear or linear-oblong; culms less than 30 cm |
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(12) |
| + |
Panicle open to laxly contracted, not spikelike; culms 20–100 cm |
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(13) |
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| 12 (11) |
Leaf blades filiform, 0.4–0.8 mm wide; spikelets ca. 2.5 mm; callus subglabrous. |
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8 A. mackliniae |
| + |
Leaf blades linear, 1–3 mm wide; spikelets 2.8–4 mm; callus hairs ca. 0.2 mm. |
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9 A. hugoniana |
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| 13 (11) |
Culms weak, scrambling, 100–130 cm long; panicle ovate, ca. 30 cm, very delicate, branches and pedicels divaricate. |
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10 A. brachiata |
| + |
Culms erect, tufted, usually less than 100 cm; panicle narrowly oblong to ovate, 3–25 cm, branches and pedicels not divaricate |
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(14) |
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| 14 (13) |
Spikelets usually dark purple; glumes unequal; plant often less than 30 cm tall. |
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11 A. nervosa |
| + |
Spikelets usually green or grayish green, occasionally violet tinged; glumes subequal; plant (20–)40–100 cm tall |
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(15) |
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| 15 (14) |
Anthers 0.3–0.5(–0.7) mm; spikelets 1.3–1.8 mm (if longer, anthers small) |
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(16) |
| + |
Anthers 0.5–1.5 mm; spikelets 1.8–3.2 mm |
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(17) |
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| 16 (15) |
Leaf blades (2.5–)4–11 mm wide; glumes subacute; lemma 3/4–9/10 spikelet length; palea 0.3–0.6 mm. |
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12 A. micrantha |
| + |
Leaf blades 1–5 mm wide; glumes acuminate; lemma 2/3–3/4 spikelet length; palea less than 0.25 mm. |
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13 A. clavata |
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| 17 (15) |
Spikelets 2.5–3.2 mm; anthers 1–1.5 mm. |
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14 A. kunmingensis |
| + |
Spikelets 1.9–2.8 mm; anthers 0.5–1 mm |
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(18) |
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| 18 (17) |
Panicle open, elliptic to narrowly ovate; branches bare in lower part; palea less than 0.2 lemma length. |
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15 A. infirma |
| + |
Panicle usually contracted, lanceolate-oblong; branches often bearing spikelets from base; palea 0.2–0.4 lemma length. |
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16 A. arisan-montana |
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| 19 (10) |
Awn usually arising from middle of lemma back or above; anthers 0.5–1.2 mm |
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(20) |
| + |
Awn usually arising from below middle of lemma back; anthers 1–1.6 mm |
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(23) |
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| 20 (19) |
Panicle open, ovate to broadly elliptic; branches widely spreading to divaricate, up to 10 cm, bare in lower part |
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(21) |
| + |
Panicle laxly contracted, lanceolate; branches ascending, up to 3.5 cm, with spikelets from near base |
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(22) |
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| 21 (20) |
Leaf blades 2–5 mm wide; panicle elliptic, branches ascending; spikelets 1.8–2.7 mm. |
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18 A. sozanensis |
| + |
Leaf blades 0.5–2 mm wide; panicle ovate, branches divaricate; spikelets 2.6–3.5 mm. |
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19 A. hookeriana |
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| 22 (20) |
Culms 12–20 cm tall; cauline leaf blades 1–2 mm wide; spikelets dark purple; awn arising from middle of lemma. |
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20 A. sinorupestris |
| + |
Culms 30–50 cm tall; cauline leaf blades 3–5 mm wide; spikelets greenish gray; awn arising from upper 1/4–1/3 of lemma. |
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21 A. sinocontracta |
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| 23 (19) |
Plant with creeping surface stolons. |
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22 A. canina |
| + |
Plant with subterranean rhizomes or tufted |
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(24) |
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| 24 (23) |
Leaf blades smooth on abaxial surface; panicle branches smooth. |
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23 A. flaccida |
| + |
Leaf blades scabrid on abaxial surface; panicle branches smooth or scabrid |
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(25) |
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| 25 (24) |
Rhizomes present, plant loosely tufted; panicle open, at least at anthesis; callus subglabrous, hairs 0.1–0.3 mm. |
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24 A. vinealis |
| + |
Rhizomes absent, plant densely tufted; panicle contracted; callus bearded, hairs 0.3–0.4 mm. |
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25 A. turkestanica |
