August, 1955 
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. 
EBENACEAE 
Diospyros virginiana L. Persimmon 
occasionally was found growing as scatter- 
ed individuals in the hill prairies of south- 
ern Illinois. 
OLEACEAE 
Fraxinus americana L. White ash, 
common in wooded coves, was found in a 
few hill prairies. 
Fraxinus nigra 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 angularis (L.) Pursh. Rose 
gentian, or rose-pink, was collected from 
rock prairie at Sessions. 
APOCYNACEAE 
Apocynum cannabinum L. Hemp dog- 
bane, or Indian hemp, chiefly of open 
woods, glades, prairies, and _ roadsides, 
was co!lected at Principia and Fountain 
Bluff. 
Apocynum sibiricum 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) Woodson. 
[Acerates hirtella Pennell.] Although 
ommon in upland prairie in IIlinois, it 
as collected in hill prairie only at Edge- 
ont. 
Evers: Hiiv Prairies oF ILLINois 435 
Asclepias quadrifolia Jacq. This wood- 
land milkweed was seen in rock prairie 
at Government Rock. 
Asclepias stenophylla Gray. [Acerates 
angustifolia (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 found in but one hill prairie, 
Government Rock. It is one of the most 
attractive prairie plants. It can be suc- 
cessfully transplanted to home gardens. 
Asclepias verticillata L. Horsetail or 
whorled milkweed, poisonous to livestock, 
was found in 18 hill prairies, most of 
them in northern and central Illinois. 
Asclepias viridiflora Raf. [Acerates vir- 
idiflora (Raf.) Eaton.| This green milk- 
weed was common in hill prairies; it was 
observed in 20 of them. 
POLEMONIACEAE 
Phlox bifida Beck. Sand phlox was 
found in five rocky prairies in southern 
Illinois, and in five sandy loess prairies in 
the Illinois River valley. 
Phlox pilosa L. Downy phlox was 
found in five hill prairies, on either rocky 
or loess slopes. 
BORAGINACEAE 
*Lappula echinata Gilib. European 
stickseed was collected at Chautauqua in 
rock prairie. 
Lithospermum canescens (Michx.) 
Lehm. This gromwell occurred on 2 rock 
and 14 loess prairie slopes. 
Lithospermum  croceum Fern.  A\l- 
though common in sand prairie in Illinois, 
this species was collected in only two hill 
prairies, Seehorn-Payson and North El- 
dred. 
Lithospermum incisum Lehm. This nar- 
row-leaved gromwell was very common in 
hill prairie from Bielema and Devil’s 
Backbone south to Allen Lake. It was 
observed in 27 prairies. 
Myosotis verna Nutt. This forget-me- 
not was found in the Fountain Bluff 
prairie. 
Onosmodium occidentale Mack. False 
gromwell or marbleseed was seen in seven 
