130 MISSOURL BOTANICAL GARDEN. 
stems one meter in height. Very much resembles A. 
multiflorus Ait., and indeed it may yet prove to be an 
extreme form of that species, but after a long comparison 
with authentic specimens, and a critical examination of all 
the specimens collected, Mr. J. G. Smith and I decided 
that it must be a form of A. amethystinus. One other 
Aster, A. paniculatus Lam. (Watson No. 409), was col- 
lected on the bottom-prairie near the mounds. (Watson 
No. 401.) 
ANTENNARIA PLANTAGINIFOLIA (L.) Rich. 
Common on the bare parts of the mounds. (Watson 
No. 414.) 
SILPH(UM INTEGRIFOLIUM Michx. 
Common down the sides of all the mounds. S. lacin- 
iatum L. (Watson No. 416), and S. perfoliatum L. 
(Watson No. 417), were abundant on the bottom-prairie 
below the mounds. (Watson No. 415.) 
HE iopsis scaBra Dunal. 
Common along the backbones of the mounds. (Watson 
No. 418.) 
Hevrantaus Maxrmixiani Schrad. 
Common down the sides and along the backbones of 
most of the mounds. H. grosse-serratus Martens ( Watson 
No. 420), which it somewhat resembles, is abundant on the 
bottom-prairie below. Since Maximilian collected the 
species in Missouri in 1815, it has been found in Wright 
County, 1884 (Bush), and in Jackson County at Sheffield, 
1892 (Bush No. 413). (Watson No. 419.) 
ARTEMISIA GNAPHALODES Nutt. 
Abundant around the bases of the mounds, and along the 
backbones. (Watson No. 421.) 
CacaLia TUBEROSA Nutt. 
Common near the base of the mounds. (Watson No. 422). 
