Trisetum GRAMINEAE Holcus 



Key to the Species 

 Culms 90-150 cm. tall, 7-10-noded: lower lemma 5.0-6.5 mm.; awn 



4-6 mm. long 1 • T. henryi 



Culms 45-90 cm. tall, 2-3-noded: lower lemma 6.5-8.0 mm.; awn 



7-9 mm. long 2. T. macranthum 



1. Trisetum henryi Rendle (F.H.E.3:400). Culms 90-150 cm. high, with 7-10 nodes. 

 Central China; locally in An., Che., Ki. Open meadows and moist shade. 



2. Trisetum macranthum (Hack.) Keng (7\ flavescens var. macranthum Hack.) (Si. 

 11:411). Culms 45-90 cm. high; fls. V; fr. VI; culms with 2-3 nodes. Eastern 

 Asia; locally in Che., Ku. Moist woods, bamboo groves. 



24. Avena Linn. Oat s&i^M (Yen Mai Shu) 

 Annuals (ours) with open panicles: spikelets over I cm. long, 2-3-fld., drooping: 

 lemmas indurate with membranous apex, 3-7-nerved, dorsally awned or awnless; 

 glumes several-nerved. Over 50 species, in the temperate zone; 10 in China. (The 

 classical Latin name.) 



Key to the Species 



a. Spikelets mostly 2-fld.: florets not readily separating; awn 



usually straight or wanting; lemmas glabrous 1. A. saliva 



aa. Spikelets mostly 3-fld.: florets readily separating; awn 

 stout, geniculate, twisted. 



Lemmas sparsely villous to beyond the middle 2. A. fatua 



Lemmas dorsally glabrous. 



Rachilla stouter, stiffly villous 2a. A. fatua var. glabrata 



Rachilla slender, softly pubescent or nearly glabrous.. 2b. A. fatua var. mollis 



1. Avena sativa Linn. Oat (Hitch.300). Culms 30-75 cm. high. Eurasia; locally in 

 Ku. Waste places. Fig. 414. 



2. Avena fatua Linn. Wild Oat a&3g (Yen Mai; Swallow's Wheat) (Hitch.300). Culms 

 30-75 cm. high; fls. IV; fr. V. Eurasia, northern Africa; locally in Che., Ku. 

 Roadsides and field margins. 



2a. Avena fatua Linn. var. glabrata Peterm. (Peterm.13). Habit and habitat as in 



A. fatua. 

 2b. Avena fatua Linn. var. mollis Keng (Si. 11: 411). Culms 75-100 cm.; fls. IV; fr. 



V. China; locally in Ku. Waste ground. 



25. Holcus Linn. M^^JS (Jung Mao Ts'ao Shu; Velvet-grass Genus) 

 Perennials velvety throughout, with contracted panicles: spikelets 2-fld., disarticu- 

 lating below the glumes: lower lemma awnless; the upper bearing on the back a short 

 awn. About 8 species, in Europe and Africa; one in China. (Ancient Latin name 

 for a kind of grain.) 



Key to the Species 



Rhizomes wanting 1 • H. lanatus 



Rhizomes present 2 . H. mollis 



1. Holcus lanatus Linn. Velvet Grass (Hitch.305). Culms 30-60 cm. high; fls. VI; 

 fr. VIII. Introduced from Europe; locally in Ki. Open damp ground. 



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