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FOC | Family List | FOC Vol. 22 | Poaceae | Poa

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).

1 Culms with bulbous bases due to basally swollen sheaths; spikelets frequently viviparous (P. sect. Arenariae)   (2)
+ Culms without basally swollen sheaths (rarely culm base swollen); spikelets infrequently viviparous   (4)
2 (1) Lemma entirely glabrous; plants of mountain slopes and meadows.   5 P. bactriana
+ 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   (3)
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.   6 P. bulbosa
+ 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.   P. timoleontis var. dshilgensis
4 (1) Palea keels usually scabrid; panicle branches smooth or distally sparsely scabrid (P. sect. Alpinae).   4 P. alpina
+ Palea keels smooth; panicle branches smooth (P. sect. Micrantherae)   (5)
5 (4) Anthers 0.2–1 mm; annuals; lemma with intermediate veins pubescent (rarely the whole lemma glabrous), area between veins glabrous   (6)
+ Anthers 1.2–3.5 mm; perennials; lemma with intermediate veins glabrous or pubescent, area between veins glabrous or pubescent   (7)
6 (5) Anthers 0.6–1 mm, more than 1.5 × longer than wide; panicle branches ascending to widely spreading or reflexed.   8 P. annua
+ Anthers 0.2–0.5 mm, not more than 1.5 × longer than wide; panicle branches ascending.   9 P. infirma
7 (5) Palea keels shortly villous, smooth; lemmas glabrous between veins; anthers (1.2–)1.5–1.8(–2.5) mm.   10 P. supina
+ Palea keels glabrous, scabrid; lemmas sparsely pubescent or glabrous between veins; anthers 1.7–3.25 mm.   11 P. veresczaginii

Lower Taxa


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