176 PITTONIA. 
on Messrs. Britton and Brown to tell how it was, that 
this plant was introduced from the prairies into the south- 
eastern United States almost a century before the prairies 
were known, or any of the plants peculiar to them. 
There seems no reason whatsoever for saying that R. hirta 
is “native only on the western prairies,’ rather than of 
those localities in which Dillenius knew that it grew when 
describing it; and that so long before the prairie botany 
began to be known, or prairie plants had any means by 
which to migrate eastward. 
/R. FLORIDANA. Perennial, erect, with striate, hispid 
stems fastigiately branched: cauline leaves scabro-hispidu- 
lous, oblong or lanceolate-oblong, rather conspicuously 
serrate-toothed, acute, the lower tapering to narrowly winged 
petioles; the upper sessile and semiamplexicaul: peduncles 
from hispid to glabrous, 8 to 12 inches long: involucral 
bracts oblong or linear-oblong, nearly 4 inch long: rays 
10 to 12, linear-oblong, an inch long or more: disk hemi- 
spherical. 
Specimens collected by Geo. V. Nash (No. 2272), at San- 
ford, Orange Co., Fla., in 1895, and labelled R. bicolor, Nutt. 
Its short stiff pubsecence, short involucre and hemispher- 
ical disk clearly distinguish this from R. hirta, Linn.; while 
the perennial root altogether forbids its classification with 
the bicolor of Nuttall, which is an annual. 
^Var. ANGUSTIFOLIA. Simple or branched from near the 
base, more slender than the type; and sometimes mono- 
cephalous: basal leaves narrowly spatulate-lanceolate, re- 
motely serrulate, about 2 inches long; cauline 1-nerved, 
linear to linear-lanceolate or oblong. 
Specimens collected by Rev. A. B. Langlois at Mander- 
ville, La., in 1893. 
