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

78. Poa araratica Trautvetter, Trudy Imp. S.-Peterburgsk. Bot. Sada. 2: 486. 1875.

阿洼早熟禾 a wa zao shu he

Poa crymophila Keng ex C. Ling.

Culms tufted, 20–35(–45) cm tall, erect or slightly geniculate, scabrid or glabrous, nodes 2 or 3, at or above base, upper part often naked, uppermost internode frequently thick, up to 1–2 mm. Shoots extravaginal. Leaf sheath longer than blade; blade flat or folded, 3–8 cm × 1–2 mm, scabrid; ligule (0.5–) 1.5–2.5(–7) mm. Panicle 3–5(–10) × 1–2 cm, branches 1–3(–5) per node, spikelets scattered. Spikelets 4.5–5.5(–8) mm, rachilla glabrous to pilose; glumes subequal, usually almost as long as spikelet; lemma 2.5–3.8 mm, keel, veins and area between veins hairy to entirely glabrous; callus webbed or glabrous; palea glabrous to pubescent between keels. Anthers 1.2–1.4 mm. Fl. Aug–Oct.

Open grassy slopes, subalpine forest margins; 2000–4200 m. Gansu, Hebei, Nei Mongol, Qinghai, Shaanxi, Sichuan, Xinjiang, Xizang, Yunnan [India, Kazakhstan, Kyrgyzstan, Mongolia, Nepal, Pakistan, Russia, Tajikistan, Uzbekistan; SW Asia].

Poa araratica is treated here as a hybrid complex comprising many populations of different stages of stabilization and of obscure taxonomic status. It seems to have arisen through hybridization between P. versicolor and P. glauca.

1 Lemma pubescent between veins   (2)
+ Lemma glabrous between veins   (3)
2 (1) Ligule 1–3 mm.   78c subsp. ianthina
+ Ligule 3–7 mm.   78e subsp. altior
3 (1) Lemma keel and marginal veins almost entirely glabrous, sometimes with minute or single hairs.   78d subsp. psilolepis
+ Lemma keel shortly villous for 1/2 of length, marginal veins for 1/3   (4)
4 (3) Ligule 1.5–2.5 mm.   78a subsp. araratica
+ Ligule 0.5–1 mm.   78b subsp. oligophylla


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