- 
-78 TRIANDRIA. MONOGYNIA. 
terior valve. tridentate or $-awned, interior bi- 
dentate. «Neutral 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, rigid, mucronate, of a bluish purple, 
persistent. Nerves of the corolla mucronate or awned; 
awns short, longest in the neutral flower, 2 of the 3 neur- 
ly unconnected, arising from the base of the neutral valve. 
Anthers 3, linear, fulvous. Styles 2, filiform, siigma plu- 
mose. (A genus nearly allied to Ses/eria.) 
Species. 1. A. apludoides, ( Chloris curtipendula, Mic. 
Cynosurus secundus? Pursh, Appendix, 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, I-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 e: ed beyond the calix, the 2 others in- 
cluded, arising nearly from the base of the valve, (im- 
properly considered, and described by Michaux, as the 
rudiments of 2 other flowers.)—This grass begins to ap- 
: in the Western parts of Pennsylvania, and continues 
‘to be met with through Ohio, Hlinois, Louisiana, and up 
the Missouri, prebably to its sources. Like the Sesleria 
cerulea, it appears to be confined to calcareous soil. 
2. A. *oligestachyum. 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 near the mid@le of the valve; neutral valye 3-awned. 
On the plains of the Missouri with the above. Common. 
Cuim round, filiform, 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 spikes 
shortly bearded. Spikes 1, 2, or 3, about an inch long, 
ally curved backwards, unilateral, compressed, and 
_ pectinate, the second spikes bibracteate, rachis semite- 
rete. Glumes in a double row, opposite; each 2-Aowereds 
ee 
RS 
12 we tl 
