August. 1955 



EvERs: Hi I.I. Pr.airies of Illinois 



433 



and in 2 rock prairies. It was found also 

 in wooded coves nearby. 



VlTACE.AE 



litis spp. Stunted individuals of prob- 

 ably four species of grape were found in a 

 number of hill prairies. No fruiting vines 

 were found in these hill prairies. 



Hyperic.^ce.ae 



^Hypericum perforatum L. Common 

 St. Johns-wort was found in two loess 

 prairies. Sunset Trail and Bluffs. 



Hypericum punctatum Lam. Spotted 

 St. Johns-wort was observed in five hill 

 prairies in central and southern Illinois. 



Hypericum sphaerocarpum Alichx. 

 Round-fruited St. John's-wort was seen 

 in hve prairies. 



CiSTACEAE 



Helianthemum bicknellii Fern. Frost- 

 weed, a plant of sand prairie, rocky prai- 

 rie, and glade, was found in sandy loess 

 at Menominee Station and Sunset Trail. 



Lechea leggettii Britt. & Hollick. This 

 pinweed was observed in loess at Menomi- 

 nee Station. 



Lechea stricta Leggett. It was seen in 

 hill prairie only at Valmeyer. 



Lechea villosa Ell. This species was 

 encountered at Principia. 



ViOLACEAE 



J'iola pedata L. Bird-foot violet was 

 not found frequently. It grew on rocky 

 slopes at Government Rock and in loess 

 at Balk and Devil's Backbone. 



Viola rafinesquii Greene. [J . kitaibeli- 

 ana var. rafinesquii (Greene) Fern.] 

 Field or wild pansy, a plant of prairies, 

 roadsides, glades, and waste places, oc- 

 curred in five hill prairies. 



Lo.-^SACE.'^E 



Mentzelia oUgosperma Nutt. Stick- 

 leaf, or few-seeded mentzelia, fig. 28, 

 grew chiefly in crevices of rock ledges; it 

 grew also on rock> slopes above the ledges. 

 It was collected on ledges at North Pan- 

 darmie. Fults, and Phegley; on rock prai- 

 rie, as, well as ledges, at Seehorn-Payson, 

 Sessions, South New Canton, Swarnes, 

 and Valmeyer. It was not observed in 

 the hill prairies between Swarnes and 



Valmeyer, nty north along the bluffs east 

 of the Bluff Hall railroad siding in Adams 

 County. In Illinois it is apparently re- 

 stricted to unglaciated bluffs or to those 

 not glaciated since Kansan time. This 

 genus is one of those of chiefly western 

 distribution which reaches its eastern limit 

 in exposed xeric habitats in western Illi- 

 nois. 



C.'\CT.ACEAE 



Opuntia rafinesquii Engelm. \_0. hunii- 

 fusa Raf.] The prickly pear was ob- 

 served at 10 sites from Seehorn-Payson 

 south to Phegley. It was found on rock 

 ledges at Seehorn-Payson, Valmeyer, and 

 Stotz ; on rocky and loess slopes at Ses- 

 sions, Housen, Chautauqua, Principia, 

 Fults, Sampson, and Phegley. 



Onagr.\ce.ae 



Gaura biennis L. Biennial gaura, a 

 plant of prairies, roadsides, and waste 

 places, was collected in Seehorn-Payson, 

 Reavis Spring. Bluff Springs, Valmeyer, 

 and Fults prairies. 



Oenothera biennis L. Common evening 

 primrose was seen infrequently in eight 

 hill prairies. 



Oenothera laciniata Hill. This evening 

 primrose was found in 1 1 hill prairies in 

 central and southern Illinois. 



Umbelliferae 



Chaerophyllum sp. An unidentified spe- 

 cies of this genus was found at Clen- 

 denny. 



*Daucus carota L. Wild carrot was 

 collected only at Phegley, where but few 

 plants were found. 



Polytaenia nuttaUii DC. Prairie-pars- 

 ley was found growing in loess prairie 

 and also at the border between prairie and 

 rock ledges. It was collected at Reavis 

 Spring. Chautauqua, Valmeyer, and 

 Fults. 



Spermolepis inerrnis (Nutt.) Math. &: 

 Const. This umbellifer was found in 

 loess prairie and on rock ledges at See- 

 horn-Payson. 



Taenidia integerrima (L.) Drude. 

 Taenidia, or yellow pimpernel, was 

 found on rocky slopes at Cave Creek. It 

 was restricted principally to slopes with 

 sparse cover, or to comparatively bare 



