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

50. Festuca cumminsii Stapf in J. D. Hooker, Fl. Brit. India. 7: 349. 1896 [“1897”], aggregate.

纤毛羊茅 xian mao yang mao

Plant loosely or densely tufted; shoots intravaginal. Culms 4–45 cm tall, nodes 1–3. Leaf sheaths glabrous or pubescent; auricles acute erect swellings or absent; leaf blades conduplicate, (1.5–)5–10(–14) cm × 0.2–0.4 mm, 0.5–0.8 mm deep, veins 5–7(–9); adaxial to abaxial sclerenchyma strands absent, abaxial sclerenchyma in 3 narrow discrete strands; ligule 0.1–0.4 mm, margin ciliolate. Panicle contracted to spikelike, 2–10 cm; branches stiffly ascending to erect, 1 at lowest node. Spikelets 5–10 mm, greenish, brownish or purplish; florets 2–6; glumes often ciliolate on margins; lower glume narrowly lanceolate; upper glume lanceolate to broadly lanceolate; lemmas 3.2–6 mm, scabrid; awns 0.8–3 mm; palea keels scaberulous or scabrid. Anthers (0.8–)1–3 mm. Ovary apex glabrous. Fl. and fr. May–Sep.

Forest margins, under shrubs, grassy or stony mountain slopes, alpine meadows, among pebbles in mountains, floodlands; 2500–5300 m. Gansu, Hubei, Nei Mongol, Qinghai, Sichuan, Xinjiang, Xizang, Yunnan [Bhutan, India (Sikkim), Kashmir, Kazakhstan, Kyrgyzstan, Mongolia, N Pakistan, Russia (Altay), Tajikistan; SW Asia (N Iran)].

The name Festuca cumminsii is used here in a broad sense to include a number of segregate taxa that can be grouped together as the F. cumminsii aggregate. The aggregate is characterized by intravaginal branching, leaf sheaths closed for more than half their length, and leaf sclerenchyma in 3 small strands. Festuca cumminsii s.s. is known only from Bhutan and India (Sikkim). Taxa in the aggregate that occur in or very near China are as follows.

1 Anthers 1.7–3 mm   (2)
+ Anthers 1–1.6 mm   (4)
2 (1) Spikelets brownish green   (3)
+ Spikelets often with a violet tinge; leaf blades with 5–7 vascular bundles.   50c F. alaica
3 (2) Leaf blades with 7 vascular bundles, abaxial surface smooth   50a F. borissii
+ Leaf blades with 5 vascular bundles, abaxial surface somewhat scabrid.   50b F. kurtschumica
4 (1) Lemmas pale green, usually violet-tinged, dull; sheaths on tillers closed for 1/2 their length or less   (5)
+ Lemmas brownish green, slightly glossy; sheaths on tillers closed for 1/2 their length or more   (6)
5 (4) Leaf blades with 5 vascular bundles.   50d F. coelestis
+ Leaf blades almost always with 7(–9) vascular bundles.   50e F. tschatkalica
6 (4) Lemmas 4.5–6 mm, broadly lanceolate.   50f F. pamirica
+ Lemmas 3.2–4.3 mm, lanceolate-ovate.   50g F. goloskokovii


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