Deyeuxia 



GRAM1NEAE 



Agrostis 



Awn o-divided; no line of demarcation between the 



awn and lemma 44 . Aristida 



DD. Lemma membranaceous or thinnei than the glumes. 



E. Rachilla prolonged behind the palea into a minute 



plumose bristle 36. Deyeuxia 



EE. Rachilla not prolonged behind the palea. 



Panicle open or contracted: glumes not keeled, 

 acute or acuminate. 



Lemma long- villous at the base 37. Calamagrostis 



Lemma glabrous or puberulent at the base 38. Agrostis 



Panicle dense, cylindrical: glumes compressed- 

 keeled, abruptly awned or mucronate 39. Phleum 



36. Deyeuxia Clarion ttPc^M (Tu Shih Ts'ao Shu; Deyeux's-grass Genus) 

 Perennials with open or contracted panicles: spikelets 1-fld., the rachilla prolonged 

 behind the palea into a minute plumose bristle: glumes 1-3-nerved, acute or acuminate; 

 lemmas 3-5-nerved, the mid -nerve usually deviating from near the base or above the 

 middle into an awn. Over 100 species, in temperate zone; 20 in China. (After Nicolas 

 Deyeux, 1753-1837, a French chemist and apothecary.) 



Key to the Species 

 Awn 2-4 mm. long, straight; callus hairs about 3/4 as long as the 



lemma 3. D. hakonensis 



Awn 6-9 mm. long, geniculate; callus hairs 1/4-1/3 as long as the 

 lemma. 



Spikelets creamy or purplish, in a loose panicle 1. D. hupehenste 



Spikelets pale green or straw-colored, in a dense panicle 2. D. sylvatica 



var. collina 



1. Deyeuxia hupehensis Rendle (F.H.E. 3:394). Culms 60-120 cm. high; fls. IX; fr. 

 X. Temperate Asia; locally in An., Che., Ki., Ku. Woody slopes and grassland. 



2. Deyeuxia sylvatica (Schrad.) Kunth var. collina (Franch.) Rendle (F.H.E.3:396). 

 Culms 90cm. high; fls. VII; fr. VIII. China; locally in An., Ki. Exposed slopes. 



3. Deyeuxia hakonensis (Franch. & Savat.) Keng {Calamagrostis hakonensis Franch. 

 & Savat.) (Si. 11:411). Culms 30-60 cm. high; fls. VI; fr. VII. Eastern Asia; 

 locally in An., Che. Shady woods. 



37. Calamagrostis Adans. Reedgrass W^-^M (Fu Tzii Mao Shu; 



Broom-grass Genus) 

 Stout perennials with dense contracted panicles (ours): spikelets 1-fld., without 

 prolonged rachilla: glumes linear; lemma hyaline, denticulate or 2-cleft, dorsally awned 

 below the tip or near the middle; callus hairs dense, longer than the lemma. About 

 15 species, in temperate zone of Old World; 3 in China. (Greek: kalamos, a reed, 

 and agrostis, a grass.) 



1. Calamagrostis epigejos (L.) Roth (Hitch.328). Culms 50-150 cm. high, and with 

 long vigorous rhizomes; fls. VI; fr. VIII. Eurasia; locally in An., Che., Ki., Ku. 

 Ravines and swampy places. Fig. 422. 



38. Agrostis Linn. Bentgrass I5,!x1IM (Chien Ku Ying Shu; 



Scissors- like Genus) 

 Usually perennials with open or contracted panicles: spikelets 1-fld., without 



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