August, 1955 



EvKRS: Hii,i. Pr\irii:.s of Ii.i.inois 



435 



and glades, grew on the sandstone ledges 

 and in rock prairie at Fountain Bluff. 



Primulaceae 



Androsace occidentalis Pursh. This 

 species was encountered on the rock ledges 

 at Valmeyer and in the rock prairie at 

 Devil's Backbone. 



Dodecatheon meadia L. This shooting 

 star, occurring in both prairie and forest 

 in Illinois, was found in loess prairie at 

 Reavis Spring and in the border of prairie 

 and rock ledge at Valmeyer. 



Kbenwceae 



Dirjspyros virginiatia L. Persimmon 

 occasionally was found growing as scatter- 

 ed individuals in the hill prairies of south- 

 ern Illinois. 



Oleaceae 



I'raxinu;: amerknita L. White ash, 

 common in wooded coves, was found in a 

 few hill prairies. 



Fraxinus itigra Marsh. Black ash was 

 observed in the border between the rock 

 ledge and rock prairie at Principia. It 

 was observed in no other prairie. 



Gentianaceae 



Gentiana quinquefolia L. Stiff gentian 

 was collected in loess at Wiersma. 



Sabatia annularis (L,> Pursh. Rose 

 gentian, or rose-pink, was collected from 

 rock prairie at Sessions. 



Apocynaceae 



Apocyiiiim caininhiinim L. Hemp dog- 

 bane, or Indian hemp, chiefly of open 

 woods, glades, prairies, and roadsides, 

 was collected at Principia and Fountain 

 Bluff. 



Apocyninii slhiricum Jacq. This dog- 

 bane was found in two prairies, Seehorn- 

 Payson and Ursa. 



Asclepiadaceae 



Asclepias amplexicaulis Sm. This milk- 

 weed was collected from eight loess prai- 

 ries. 



Asclepias hirtella ( Pennell ) AVoodson. 

 [Acerates hirtella Pennell.] Although 

 common in upland prairie in Illinois, it 

 was collected in hill prairie only at Edge- 

 mont. 



Asclepias quadrifolia Jacq. This wood- 

 land milkweed was seen in nick prairie 

 at Government Rock. 



Asclepias stenopbylla Gra\'. [^Acerates 

 ant/iistifolia (Nutt.) Dene.] This spe- 

 cies of green milkweed was collected from 

 eight hill prairies in Adams, Pike, and Cal- 

 houn counties. In Illinois, it is appar- 

 ently restricted to hill prairies. 



Asclepias tuberosa L. Butterfly-weed, 

 common in some upland prairies in Illi- 

 nois, was fdund in hut one hill prairie, 

 Go\ernment Rock. It is one of the most 

 attractive prairie plants. It can be suc- 

 cessfully transplanted to home gardens. 



Asclepias verticillala L. Horsetail or 

 whorled milkweed, poisonous to livestock, 

 was found in 18 hill prairies, most of 

 them in northern and central Illinois. 



Asclepias viridiflrjra Raf. [Acerates vir- 

 idiflnra ( Raf. I Eaton.] This green nu'lk- 

 weed was common in hill prairies; it was 

 observed in 20 of them. 



Polemoniaceae 



Phlox bifida Beck. Sand phlox was 

 found in fi\e riKky prairies in southern 

 Illinois, and in five sandy loess prairies in 

 the Illinois River valley. 



Phlox pilosa L. Down\ phlox was 

 found in five hill prairies, on either rocky 

 or loess slopes. 



BORAC.INACEAE 



*Lappiila echinata Gilih. European 

 stickseed was collected at Chautauqua in 

 rock prairie. 



Lithospcrrinim canescens (Michx.) 

 Lehm. This gromucU occurred on 2 rock 

 and 14 loess prairie slopes. 



Lilhospermum croceum Fern. .Al- 

 though common in sand prairie in Illinois, 

 this species was collected in onl.\' two hill 

 prairies, Seehorn-Payson and North El- 

 dred. 



Lithosperniuni incisiim Lehm. This nar- 

 riiu-lcaved gromwell was very common in 

 hill prairie from Bielema and Devil's 

 Backbone south to .Mien Lake. It was 

 observed in 27 prairies. 



Myosotis verna Nutt. This forget-me- 

 niit was found in the Foimtain Bluff 

 prairie. 



Onosmodium occideiilale .\Lick. False 

 gromwell or marbleseed was seen in seven 



