Hordeum GRAMINEAE Hystrix 



Key to the Species 



Lemma long-awned, or awnless without appendage 1. H. vvlgare 



Lemma awnless with a dilated 3-fid appendage la. H. vvlgare 



var. trifurcatwm 



1. Hordeum vuteare Linn. Barley ±^ (Ta Mai; Large Wheat) (Hitch.274). Culms 

 50-100 cm. high; fls. IV; fr. V. Widely cultivated; locally in An., Che., Hon., 

 Hun., Hup., Ki., Ku. Cultivated fields. Fig. 421. 

 la. Hordeum vulgare var. trifurcatum (Schlecht.) Alef. Beardless Barley (Hitch. 

 274). Culms 90cm. high; fls. IV; fr. V. Introduced from Himalaya region; 

 occasionally in Ku. Cultivated fields. 



35. Hystrix Moench mMW, (Wei Ts'ao Shu; Hedgehog-grass Genus) 

 Perennials with loosely fld. terminal spikes: spikelcts 1-2-fld. (ours), l-2-natc at 

 each node, the floret dorsiventral to the rachis: glumes 2, reduced to minute bristles, 

 lemmas convex, rigid, 5-nerved above, tapering into long awns. About 7 species, in 

 eastern Asia and North America; 1 in China. (Greek: hustrix, a hedgehog, alluding 

 to the bristly spikes.) 



1. Hystrix duthiei (Stapf) Bor (Asperclla duthiei Stapf) (H.F.7:375). Culms 60-120 

 cm. high; fls. V; fr. VI. Western Himalaya to Japan; locally in Che. Shady 

 woods and waste roadsides. 



Tribe VI. Asrostideae Bentgrass Tribe $$WiM$k (Chien Ku Ying Ts'u) 

 Spikelets 1-fld., perfect, disarticulating above or below the glumes, sometimes (as 

 n Polypogon) jointed with the pedicels and falling off with a part of the latter: glumes 

 2, longer or shorter than the floret; lemmas 5-3-1-nerved, membranaceous or thinner, 

 but often indurate at maturity; awns when present straight or geniculate, arising 

 from the tip, from the back, or from between the teeth of a bifid apex; paleae usually 

 2-keeled, sometimes minute or wanting: infl. an open, contracted or spike-like panicle. 



Key to the Genera 

 A. Spikelets disarticulating (or the pedicels jointed) below the glumes. 

 B. Spikelets laterally compressed. 



Pedicels not jointed; glumes awnless 46. Alopecurus 



Pedicels jointed; glumes awned 47. Pohjpogon 



BB. Spikelets dorsally compressed. 



Perennial : blades linear-lanceolate 48. Phaenosperma 



Annual ; blades ovate-cordate 49. Sphaerocaryum 



AA. Spikelets disarticulating above the glumes. 

 C. Glumes shorter than the floret. 



Lemma terminating in a slender awn: fr. a caryopsis. 

 Rachilla prolonged behind the palea; lemma 5-nerved . . 40. Brachyelytrvm 

 Rachilla not prolonged behind the palea; lemma 3-nerved 41. Muhlenbergia 



Lemma awnless : f r . a utricle 42 . Sporobolvs 



CC. Glumes longer than the floret. 



D. Lemma indurate or firmer than the glumes. 



Lemma awnless, without distinct callus 43. Milium 



Lemma awned, with pointed or obtuse callus. 

 Awn simple; a line of demarcation between the awn 



and lemma 45 - Sti P a 



455 



