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

77a. Poa versicolor subsp. stepposa (Krylov) Tzvelev, Novosti Sist. Vyssh. Rast. 9: 51. 1972.

低山早熟禾 di shan zao shu he

Poa attenuata Trinius var. stepposa Krylov, Fl. Altai Gov. Tomsk 7: 1856. 1914; P. attenuata subsp. botryoides Tzvelev; P. botryoides (Trinius ex Grisebach) Komarov; P. serotina Ehrhart ex Hoffmann var. botryoides Trinius ex Grisebach; P. stepposa (Krylov) Roshevitz; P. transbaicalica Roshevitz.

Culms (15–)25–50(–70) cm tall, erect, scabrid; leaf blades narrowly linear, flat or folded, 0.5–1.2 mm wide, ligule (1–)2–3 mm. Panicle contracted, narrow, (4.5–)6–10(–12) cm; branches scabrid, up to 4 cm, with few spikelets. Spikelets 3–5(–7) mm; lemma 3.5–4 mm, glabrous between veins; callus sparsely webbed. Anthers 1.2–1.5 mm. Fl. Jun–Aug. 2n = 28.

Grasslands on slopes, steppes; 200–1500 m. Heilongjiang, Nei Mongol, Xinjiang [Kazakhstan, Kyrgyzstan, Mongolia, Russia; Europe].

This subspecies is most polymorphic, and several of its populations were described as distinct species, but the characters on which these divisions were based are very unreliable and the entities cannot be recognized, even as subspecies.

Tzvelev (Novosti Sist. Vyssh. Rast. 11: 31. 1974) treated Poa botryoides as a lower-elevation subspecies of P. attenuata, the typical race of which he treated as alpine. Nevertheless, the type of P. botryoides appears to be closer to P. versicolor subsp. stepposa, being as tall as this taxon and with panicle branches as long. The type of P. transbaicalica looks like typical P. versicolor subsp. stepposa.


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