426 
Sorghastrum nutans (L.) Nash. In- 
dian grass was observed in 23 hill prai- 
ries, usually in loess but occasionally on 
rocky slopes. It was the dominant grass 
in prairie at Hill-Top and also in the 
woodland border at North Pandarmie. 
Sphenopholis obtusata (Michx.) Scribn. 
Prairie wedgegrass occurred in loess at 
Clendenny. It was seen in woodlands ad- 
joining other prairies. 
Sporobolus asper (Michx.) Kunth. 
This dropseed was observed in 10 hill 
prairies. It was frequent in loess at Prin- 
cipia. 
Sporobolus cryptandrus (Torr.) A. 
Gray. Sand dropseed was seen in loess at 
Bielema, Seehorn-Payson, and Chautau- 
qua prairies. 
Sporobolus heterolepis (A. Gray) A. 
Gray. Prairie dropseed was not common 
in hill prairie. It was observed on stony 
slopes at El Rancho and Magnolia and 
on loess at Northeast Meredosia. 
Sporobolus neglectus Nash. This an- 
nual dropseed grew on rocky slopes at 
Bielema and Clendenny hill prairies. At 
Clendenny it grew also on _ limestone 
ledges and in the border between prairie 
and wooded coves. 
Sporobolus vaginifiorus (Torr.) Wood. 
This species occurred in loess at Bielema, 
Wiersma, and Swarnes, on rocky slopes 
and sandstone ledges at Fountain Bluff, 
and on limestone ledges at Phegley and 
Sampson. 
Stipa spartea Trin. Porcupine grass, 
of infrequent occurrence in hill prairie, 
was observed at El Rancho, Balk, and 
Northeast Meredosia. It is commonly ob- 
served in flatland prairie. 
Tridens flavus (L.) Hitche. [Triodia 
flava (L.) Smyth.] Purpletop was found 
growing in loess at eight hill prairies in 
central and southern Illinois. 
Uniola_ latifolia Michx. Broadleaf 
uniola, or spike grass, common in open 
woods in southern Illinois, was found in 
the disturbed loess prairie at Government 
Rock. 
CYPERACEAE 
Carex brevior (Dewey) Mack. A 
sedge of dry, rocky ground, this plant was 
collected from 10 hill prairies in northern 
and central Illinois. 
I:tinois NATURAL History SuRVEY BULLETIN 
Vol. 26, Art. 5 
Carex glaucodea Tuckerm. [C. flacco- 
sperma var. glaucodea  (Tuckerm.) 
Kikenth.] This sedge was collected from 
rock prairie at Fountain Bluff. 
Carex gravida Bailey. 
This common — 
sedge was observed only at Bluff Springs, . 
on the loess slope. 
Carex gravida var. lunelliana (Mack.) 
E. J. Hermann. This variety was col- 
lected only at Rock Creek, from loess. 
Carex meadii Dewey. This sedge was 
collected on stony slopes at Cave Creek. 
Carex muhlenbergii Schk. This sedge, 
common in sand prairie, was observed in 
only four hill prairies, Balk, Standard, 
Chautauqua, and Fountain Bluff. 
Carex pennsylvanica Lam. A sedge of 
sterile soil and open woods, this species 
was collected at Devil’s Backbone and 
Northeast Meredosia. 
Cyperus filiculmis Vahl. The slender 
cyperus (including the variety macilen- 
tus), a plant of dry sandy soil, was seen 
in 16 hill prairies; its southernmost sta- 
tion was Fountain Bluff. 
(CCOMMELINACEAE 
Tradescantia ohiensis Raf. [T. canali- 
culata Raf.] This spiderwort was seen 
in 16 hill prairies, growing on loess or 
stony slopes. Also, it was observed in 
crevices of limestone ledges at Stotz and 
South Prairie du Rocher. 
Tradescantia virginiana L. ‘This spe- 
cies, which occurs mostly in woods, thick- 
ets, and meadows, was found on the rocky 
slopes of Fountain Bluff and Government 
Rock. 
JUNCACEAE 
Juncus dudleyi Wieg. This rush was 
observed in loess prairie at Chautauqua 
and Fountain Bluff. 
Juncus interior Wieg. This species was 
seen growing on loess slopes at Sunset — 
Trail and on rocky slopes at Standard. 
Juncus tenuis Willd. [J. macer S. F._ 
Gray.] This common rush of woodlands 
was observed only at Oblate Fathers, in 
loess. 
LILIACEAE 
Allium canadense L. Wild garlic was 
seen in loess at Oblate Fathers and Allen 
Lake. 
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