430 
projecting into mucronate points ; or in the short pedicelled abortive 
flower, into bristles or awns ; stamens three. 
45. Bouteloua Racemosa. Layasca .. 
Syn. —Chloris curtipendula, Michx. Atheroprogon apludoides, Mnhl. 
Eutriana curtipendula, Trin. Cynosurus secundus, Pursh. 
Culm erect; leaves narrow taper-pointed; spikes numerous, linear- 
oblong, rather distant, somewhat reflexed, forming a strict racime; spike- 
lets two (rarely three-flowered); lower palea of the perfect flower tricus- 
pidate ; of the abortive flower with three bristles; anthers bright-red. 
Perennial; flowers in August; culms 1 to 3 feet high. Dry prairies 
and Oak openings, from Waukesha to the Mississippi river in Wisconsin; 
also in Illinois, Michigan, Ohio, Iowa and Minnesota. 
A remarkable and very handsome grass, common on the prairies and 
openings of Wisconsin. 
46. Bouteloua Oliuostachya. Torrey. 
Syn. —Atlieropogon oligostachyum, Nutt. 
Spikes 2 or 3, nearly terminal, many-flowered, glumes and paleae pu¬ 
bescent; lower palea distinctly three-awned, the two lateral awns short¬ 
er, arising near the middle of the palea; neutral valve three-awned; 
leaves setaceous smooth, very short; culm round, filiform, nearly naked, 
smooth erect; culms 8 to 12 inches high. Drift ridges, St. Peters river, 
Minnesota, and in the interior of Iowa, Dr. C. C. Parry. 
47. Bouteloua Papillosa. Gray. 
Syn. —Atlieropogon papillosa, Engleman. (Sill. Jour. vol. 46, p. 104.) 
Culms cespitose, leafy at the base; leaves lanceolate-linear, hispid on 
the mid-rib and margin; Spikes 1 to 3, subterminal; glumes papillose- 
bispid ; outer palea of perfect flower trifid. Flowers in August; culms 
12 to 15 inches high. Sandy soil. Near Cassville, Dr. D. Houghton; 
Beardstown, III., Dr. Engleman; St. Croix, Dr. Parry. 
Plate I, Fia. 5.— a , the spike; b , a spikelet; c , outer glume; d , tho 
abortive flower ; e, a portion of the leaf. 
