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2. Poa subg. Ochlopoa (Ascherson & Graebner) Hylander, Bot. Not. 1953: 354. 1953.
黄褐早熟禾亚属 huang he zao shu he ya shu
Authors: Guanghua Zhu, Liang Liu & Robert J. Soreng
Poa sect. Ochlopoa Ascherson & Graebner, Syn. Mitteleur. Fl. 2: 387. 1900; Ochlopoa (Ascherson & Graebner) H. Scholz.
Annuals or perennials, tufted, not rhizomatous, sometimes stoloniferous in Poa sect. Micrantherae; shoots with or without bulbous bases. Culm bases bulbous or not. Uppermost leaf sheaths smooth, closed for ca. 1/4 length; blade flat or folded, papery to thickly papery; ligule membranous. Panicle open or somewhat contracted; branches smooth or scabrid; spikelets compact; vivipary present (frequent in P. sect. Arenariae) or absent; glumes usually 3-veined. Anthers 0.2–2 mm.
Thirty species: worldwide, mostly in N Africa, C and SW Asia, and Europe, in habitats such as temperate forests, steppes, alpine areas, and disturbed places, on moist to dry ground; eight species in China.
The Chinese species belong to three sections: Poa sect. Alpinae (Hegetschweiler ex Nyman) Stapf (species no. 4); P. sect. Arenariae (Hegetschweiler ex Nyman) Stapf (species nos. 5–7); and P. sect. Micrantherae Stapf (Poa sect. Ochlopoa; species nos. 8–11).
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| 1 |
Culms with bulbous bases due to basally swollen sheaths; spikelets frequently viviparous (P. sect. Arenariae) |
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(2) |
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Culms without basally swollen sheaths (rarely culm base swollen); spikelets infrequently viviparous |
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(4) |
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| 2 (1) |
Lemma entirely glabrous; plants of mountain slopes and meadows. |
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5 P. bactriana |
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Lemma somewhat pilulose to villous in lower part of the veins (if spikelets viviparous, the pubescence is retained only on a few of the least modified lemmas or is absent); plants from lower (hilly steppe) regions and plains |
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(3) |
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| 3 (2) |
Plants usually over 15 cm tall; ligules of tillers usually hyaline or slightly milky-white, 1/15–1/7(–1/5) as long as blade; panicle 2–8 cm. |
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6 P. bulbosa |
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Plants (3–)5–15(–20) cm tall; ligules of tillers white, 2–5 mm long, usually 1/5–1/2 as long as blade; panicle 0.8–2.3 cm. |
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P. timoleontis var. dshilgensis |
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| 4 (1) |
Palea keels usually scabrid; panicle branches smooth or distally sparsely scabrid (P. sect. Alpinae). |
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4 P. alpina |
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Palea keels smooth; panicle branches smooth (P. sect. Micrantherae) |
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(5) |
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| 5 (4) |
Anthers 0.2–1 mm; annuals; lemma with intermediate veins pubescent (rarely the whole lemma glabrous), area between veins glabrous |
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(6) |
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Anthers 1.2–3.5 mm; perennials; lemma with intermediate veins glabrous or pubescent, area between veins glabrous or pubescent |
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(7) |
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| 6 (5) |
Anthers 0.6–1 mm, more than 1.5 × longer than wide; panicle branches ascending to widely spreading or reflexed. |
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8 P. annua |
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Anthers 0.2–0.5 mm, not more than 1.5 × longer than wide; panicle branches ascending. |
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9 P. infirma |
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| 7 (5) |
Palea keels shortly villous, smooth; lemmas glabrous between veins; anthers (1.2–)1.5–1.8(–2.5) mm. |
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10 P. supina |
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Palea keels glabrous, scabrid; lemmas sparsely pubescent or glabrous between veins; anthers 1.7–3.25 mm. |
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11 P. veresczaginii |
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Lower Taxa
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