78 TRIANDHIA. MONOGt^NIA. 



tcrior valve tridciitatc or S-awned, interior M- 

 dentate. JS'*eutral corolla of 1 valve, with 3 ex- 

 serted awns. Seed naked, oblong, compressed, 

 with a longitudinal furrow. 



Spikes alternately disposed in a long or short raceme, 

 definite or numerous; glumes by pairs, opposite, appear- 

 ing- pectinate; rachis acuminated beyond the spikes; valves 

 of the calix narrow, rit^id, mucronate, of a bluish ptu'ple, 

 persistent. Nerves of ihe corolla mucronate or awned; 

 awns short, longest in the neutral flower, 2 of the 3 near- 

 ly unconnected, arising- from the base of the neutral valve. 

 Anthers o, linear, fulvous. Styles 2. filiform, siigma plu- 

 nmse. (A g-enus nearly allied to Sesleria.) 



Species. 1. ^. nphidoiiles, ( CJdoris cnrtipendula, M ic H, 

 Cioioaiirus secundns? Fursh, x-Vjipendix, p. 728.) Spikes 

 short, numerous, (30 or 40) reflected downwards, alter- 

 nately disposed upon a long- raceme, each containing- 

 from 4 to 10 glumes, disposed by pairs upon a compress- 

 ed rachis, mucronately terminated; outer valve of the ca- 

 lix oblong lanceolate, rigid, shortly mucronate, without 

 pubescence, generally with a single cartilaginous nerve, 

 which is a little hispid, (seen through a lens); inner valve 

 adhering to the rachis, nearly the length of the outer, 

 very narrow, 1 -nerved, resembling a bristle. Corolla 

 smooth, outer valve of the hermaphrodite 3- toothed, in- 

 ner 2. Neutral flower of one folded valve, 3-awned, the 

 central awn exserted beyond the calix, the 2 others in- 

 cluded, arising nearly from the base of the valve, (im- 

 properly considered, and described by JNIichaux, as the 

 rudiments of 2 other flowers.) — This grass begins to ap- 

 pear in the Western parts of Pennsylvania, and continues 

 lo be met with through Ohio, Illinois, Louisiana, and up 

 the Missouri, probably to its sources. Like the Sesleria 

 Citrulea, it appears to be confined to calcareous soil. 



2. A. *ollgosiachi/iim. Spikes 2 or 3, nearly terminal, 

 many flowered; calix and corolla pilose; outer valve of the 

 corolla distinctly 3-awned, the 2 lateral awns shorter, aris- 

 ing neai- the middle of the valve; neutral valve 3-awned. 



On the plains of the Missouri with the above. Common. 



Culm round, fihform, nearly naked, or with a single 

 leaf, 8 to 12 inches high, smooth and erect. Leaves very 

 short, smooth, and subulate, stipule and base of the spike's 

 shortly bearded. Spikes 1, 2, or 3, about an inch long, 

 usually curved backwards, unilateral, compressed, and 

 pectinate, the second spikes bibracteate, rachis semite- 

 vete. Glumes in a Uoiible row, oppositej each 2-flowere4|. 



