426 



Illinois Natural History Survey Bulletin 



Vol. 2fa, Art. 5 



Sorghnstrutn nutans (L.) Nash. In- 

 dian firass 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 

 woodhind border at North Pandarmie. 



Sfihcnoftliolis obtiisata (Michx.) Scribn. 

 Prairie wedgej^rass occurred in Uk'ss at 

 Clendenny. It was seen in woodlands ad- 

 joining otlier prairies. 



Sf"iroljoliis (ispcr (Michx. I Kunth. 

 This dropseed was observed in U) hill 

 prairies. It was frequent in loess at Prin- 

 cipia. 



SpnrobiAus cryptandrus (Torr.) A. 

 Gray. Sand dropseed was seen in loess at 

 Bielema, Seehorn-Pa\son, and Chautau- 

 qua prairies. 



Sporoholus hfteiuli'ph (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. 



Sp'jroholiis neglectus Nash. This an- 

 nual dropseed grew on rocky slopes at 

 Bielema and Clendenn> hill prairies. At 

 Clendenny it grew also on limestone 

 ledges and in the border between prairie 

 and wooded coves. 



Sporoholus T/it/inifionis (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. 



Stipti 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.) Hitchc. [Triodiu 

 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 brevlor (Deweyl Mack. A 

 sedge of dry, rocky ground, this plant was 

 collected from 10 hill prairies in northern 

 and central Illinois. 



Carex glaucodea Tuckerm. [C flacco- 

 speniKi var. glaucodea (Tuckerm.) 

 Kiikenth.] 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. 



(Jarex graTida \ar. luncUiana (Mack.) 

 E. J. Hermann. This variety was col- 

 lected onl\' at Rock Creek, from loess. 



(Jarex rticadii Dev\e\'. This sedge was 

 collected on stony slopes at Cave Creek. 



Carex inuhlenhergii Schk. This sedge, 

 common in sand prairie, was observed in 

 only four hill prairies, Balk, Standard, 

 CiiautaiK|ua, and Fountain Bluff. 



(Jarex pennsyh-aiiica Lam. A sedge of 

 sterile soil and open woods, this species 

 was collected at Devil's Backbone and 

 Northeast Meredosia. 



(Jyperus filiculinis \'ahl. The slender 

 c\perus (including the variety rnacilen- 

 tus), a plant of dr\' sandy soil, was seen 

 in 16 hill prairies; its southernmost sta- 

 tion was Fountain Bluff". 



CoMMliLIXACEAE 



Tradescanlia ohiensis Raf. [7'. eanali- 

 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. 



Tradescanlia virginiana L. This spe- 

 cies, which occurs mostly in woods, thick- 

 ets, and meadows, was found on the rock)' 

 slopes of Fountain Bluff and Government 

 Rock. 



JUNCACEAE 



Juncus dudlcyi VVieg. 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 rockv slopes at Standard. 



Juncus tenuis Willd. [/. macer S. F. 

 Gray.] This common rush of woodlands 

 was observed only at Oblate Fathers, in 

 loess. 



LiLL'KCEAE 



Allium canadense L. Wild garlic was 

 seen in loess at Oblate Fathers and Allen 

 Lake. 



