316 



POACE.E. 



eminent agrostologist. Dr. Gray also dedicated a genus to liim, 

 but it afterwards proved not to be distinct from Gossyjjium." 



1. T. Arkansana (Torr.) Benth. 1. c. Sclerachne ArJcansana 

 Torr. 1. c. Greenia Arkansana Nutt. 1. c. 



A soft delicate slender annual, 30-60 cm. high. Ligule short; 

 blades 5-8 cm. long. Panicle 12 cm. long, 1.5 cm. broad. Spike- 

 lets oval-lanceolate, -4 mm. long, with an awn three times as long; 

 empty glumes and floral glume 3 -nerved. 



Texas, Reverclion for U. S. Dept. Agricul. 117, Gillespie for 

 Xat. Herb., XeaUey for Nat. Herb. 

 Florida to Arkansas and Southwest. 



64. (132). Arctagrostis Griseb. Ledeb. Fl. Ross. 4:434 

 (1853). 



Spikelets 1-flowered, panicle narrow, rachilla articulate above the 

 lower glumes, smootli, not produced above the flower or very rarely 

 extending as a minute bristle. Empty glumes slightly unequal, 

 moderately acute, membranous; floral glume obtuse or 3-toothed, 

 5-nerved, the lateral ones obscure, unawned; j^tilea as long as its 

 glume or shorter, 2-nerved, obtiise, or 2-toothed. Stamens 2-3. 

 Styles distinct, very short. Grain oblong, included but not ad- 

 herent. 



A tufted perennial grass. Leaf -blades flat. Panicles slightly 

 branched, often compact. Spikelets in most respects like those of 

 Agrostis. Two species are found in the arctic and subarctic re- 

 gions of Europe, Asia, and America. A 

 genus according to Brown related to Col- 

 podium, according to Bentham related to 

 Deyenxia. The habit and size of the spike- 

 lets are more nearly like those of Poa than, 

 of Agrosfis. 



1. A. latifolia (I^. Br.) Griesb. 1. c. 

 Colpodiwn JatifoUnm E. Br. Suj)]!!. App. 



„ ^„ , ^ .. , .. Parry's A^oy. cclxxxvi (1824). Agrosti» 

 Fig. 56. — Arctagrostis latz- j j \ / ij 



folid. A, spikelet; a, paradoxa R. Br. Ross' Toy. App. ed. 2, 

 aoret. (Scribner.) ;>: 108 (1819), name only. 



Culms 10-18-80(1) cm. high. Leaf-blades of the culm 2-7 



