136 GRAMINEAE. 
g. Aristida stricta Michx. Erect Aristida. (Fig. 305.) 
Aristida stricta Michx. FI. Bor. Am. 1: 41. 1803. 
Culms 2°-4° tall, erect, simple, smooth and glab- 
rous. Sheaths shorter than the internodes, smooth, 
glabrous or pubescent at the apex; ligule short ; 
leaves involute-filiform, the basal 1° or more in 
length, those of the culm 8/—12/ long, or the upper 
shorter; panicle spike-like, strict, or the top 
sometimes nodding, 6’-2° long, its branches erect ; 
outer scales of the spikelet awn-pointed, the first 
I-nerved or occasionally with an obscure additional 
nerve on each side, shorter than the second; 
third scale equalling the first or a little shorter; mid- 
dle awn 5/10’ long, horizontal when old, the 
lateral ones shorter, erect or divergent. 
Dry soil, Virginia (according to §. Watson), south to 
Florida. July-Sept. 
io. Aristida dispérsa Trin. & Rupr. Bushy Aristida. (Fig. 306.) 
Aristida Americana ¥,. Amoen. Acad. 5: 393. 1759? 
Aristida fasciculata Torr. Ann, Lye. N. ¥. 1:154. 1824? 
Aristida dispersa Trin. & Rupr. Mem. Acad. St. 
Petersb. (VI.) 5: 129. 1842. 
Glabrous, culms 1°-2° tall, erect, slender, . 
branched, smooth, Sheaths shorter than the in- 
ternodes, ligule short, ciliate; leaves 2/-6’ long, 
1’’ wide or less, flat, attenuate into a long point, 
smooth or scabrous; panicle 3’—7’ long, at first 
strict, the branches finally more or less spreading ; 
first scale of spikelet 1-nerved, or occasionally with 
an obscure additional nerve on each side, shorter 
than the second scale; third scale equalling or longer 
than the second ; awns divergent, the middle one 
4’’-8” long, the lateral ones shorter. 
Dry soil, Kansas to Texas, Mexico, New Mexico 
and California. Aug.—Sept. 
11. Aristida tubercul6sa Nutt. Sea-beach Aristida. (Fig. 307.) 
Aristida tuberculosa Nutt. Gen, 1:57. 1818. 
Glabrous, culms 6’—2° tall, erect, dichotomously 
branched, smooth. Sheaths shorter than the in- 
ternodes; ligule short, ciliate; leaves 5/—9’ long, 
about 1’’ wide, attenuate into a long slender point, 
smooth beneath, scabrous above; panicle 5’—8’ long, 
branches slender, ascending; outer scales of the 
spikelet about equal, awned, the third scale 
shorter; awns divergent or reflexed, more or less 
coiled, united at base into a column 3//-6’’ long 
which is articulated to the scale. 
Sandy soil, especially on sea-beaches, Massachusetts 
to Minnesota, south to Georgia, Also in the interior in 
Illinois, Wisconsin and Minnesota. Aug.—Sept. 
