COMPOSITE FAMILY, 183 
13. BI’DENS, L. a ra om 
Bi-dens, having 2 teeth ; in allusion to the awns of the al 
[Latin 
Heads many- flow ered ; eS neutral, often in inooteploue and some- 
times wanting,—those of en disk tubular and perfect. Involucre 
t i acle flat- 
b> 
a 
r sometimes perennial herbs. Leaves opposite, incised- 
serrate or pinnatifidly dissected. Flowers mostly yellow. 
* Akenes flat and broadish, not beaked at summit, ciliate on the oe 
LB. fron L. Leaves odd-pinnately divided,—the low 
with 5 divisions, the upper with 33 divisions distinct and mostly pet 
olulate, lanceolate, serrate ; heads discoid, on slender axillary pedunc 
outer scales of the involucre foliace narrowed and ciliate at ret 
much longer than the a akenes obovake-condhia, 2-awned, pubescent 
and ciliate with erect hai 
Fronposr Bivens. Dicmarigoke 
annual. Stem 2-4 or 6 feet high, somewhat hairy, often dark purple, branched, 
ors segta ments 2- 4 or 5 inches tong, pil pilose beneath, abruptly ak, at base toa 
short margined ciliate ule, —the com 1-3 inches long. rather small 
on long slender naked peduncles. iclacs e double,—the 8-10 ou Reagent 9 lanceolate, 
leaf- like, unequal, 2 or 3-5 or 6 times as : long as the head, As twee, Sm with a scarious 
margin. | Flords as yellowish. Chaff of the receptacle linear-lanceolate, about as long as 
6 a enes 
Gardens, fence-rows, eg fields, &c. : throughout the United States, Fl. Au 
gust—Septem mye Fr. October 
Obs. All the species, here enumerated, are very worthless, and par- 
tir yaaa weeds,—on account of the barbed awns of the 
, 
2. B. Phi pasithiesini’ a Mr. Leaves oblong-lanceolate, tapering 
at each end, serrate, sel, and and connate at base ; heads congpicnously 
, often somewhat nodding ; outer sal of the os 
mostly shorter than t 2 danmned, re re- 
trorsely aculeate-ciliate on the m ; f 
YSANTHEMUM-LIKE BIDENs. i , 
us. Root 3 thcbine 8b # it Sabieleosl dec at 
base, bi anching, the branches opposite and axillary. Leaves 3-6 he 
rather large, solitary, terminating bepacihes r scales of the invol a Aad 
Spe ong age cildte-serrulate, spreading, largest sometimes nearly as i pd 
rays ; the inner sc: embranaceous, elliptic or ovate-oblong, nearly equal, 
long as the disk-forets. Rays bright yellow, -pigebcwcbs a: an inch ee 7 i 
ti i h at summit. 
, Scarious, 3-nerved, yellow, or some nec purplis 
Low. grounds’ along swampy rivets Leneealiy throughout the United States. Fl. 
. This species Pitti abies when in flower,—and is less inclined. 
than either Fuge sistas or the following to invade cultivated pest 
August ~September, Fr. Octo 
