TRIANDRIA. DIGYNTA.. 49 
common to Siberia, the south of Europe, Hudson’s Bay, 
and the Missouri. 
75. CRYPSIS, Lamarck, (Thorn-Grass.) 
Calix 2-valved, oblong, 1-flowered. Corolla — 
2-valved, longer than the calix. Stamina 2 or 
8. (Spike surrounded at the base by the sheath 
of the leaf; or the flowers collected into ately 
eapitulum.) 
Culm decumbent or procumbent, extremely branched; 
leaves rigid and pungent; flowers collected in squarrose 
apa or short and dense irregularly involucrate, lobed. 
- spikes. 4 
Srecies. 1. C. * squarrosa. Stem decumbent, much 
branched; leaves short, all rigid, and sharply pungent; ca- 
pituli squarrose, few flowered: dorsal vaive of the coroda 
coriaceous, somewhat cleft at the point, with a shortish 
subulate central cusp. 
On arid plains near the * Grand Detour” of the Mis- 
souri, almost exclusively covering thousands of acres, | 
and as pungent as thorns. © Not more than 3 or a 
inches high; the flowers not collected into heac 
the European species, but merely in s ase ternfina 
fascicles; the outer ‘glume of the corolla 1 ig Tikewise cleft 
so as to present 3 shor coriaceous subulate points. = 
2 Virginiea Spike oblong, thick and lobed, generally — 
sheathed. by the inflated vagine of 2 short leaves; stem — 
procumbent, genicuiate, nodes numerous, approximat-— 
ing; ‘leaves involute, rigi and | Spungent calix carinates. 
shorter than the corolla. — : 
Agrostis virginica. Wri Sp. Plant. Agrostis pungens 
* Schreber. Gram. — ini 
Leaves short, filiform subulate, rigid and divaricate, ae. 
most entirely smooth,and ‘somewhat glaucous; culm decum- 
bent branched from the base; spikes closely sheathed, axile _ 
lary and terminal, about an inch long, sometimes oblong- 
ovate, lateral spikes often very short and roundish, rachis 
thick and angular at the base; calix nearly equal, compress- 
_ ed carinate,acute, shorter than the corolla, ciliate on the 
earina (seen through a lens); corolla valves often rather _ 
unequal, inner valve somewhat obtuse, naked at the bases 
Sats exserted, jen ase? 
Dr. 
long. 
_” Grows in the streets of Philadelphi 
nie Virginia. Pursh. PR pn 
Ft appears to be allied to Phicwm, 
