1300 AMBROSIACEAE 
pucr Pau, the segments lanceolate, acute: staminate involucre broadly 
obco . high: n it 2.5-3 mm. high, the body obovoid, d 
vi th ao conic spines.—Prairies, ale dunes, pinela nds, and 
Wah nm Plain, Fla. io Tex. and N.C —(W. I.)—All yea 
3. A, glandulosa Scheele. Stem 1 m. tall or less, sparingly pubescent: leaf- 
blades bipinnatifid or pinnatifid, strigose on both sides, the segments a 24 
linear-lanceolate, acute or acumi inate e: Pn uc involuere saucer-shaped, 
mm. pese ios bg 2.5 mm. long, the body broadly obovoid, short- De 
with usually 6 D cu eed —Low grounds, river- -bottoms, and 
banks, bu Plain, W Fla. to Tex.—Sum.-fall. 
A. elatior L. Stem 1.5 m. tall or less; more or less hirsute: leaf-blades 
bipinnatifid or those of the upper ones m erely pinnati ifid, strigillose oo often 
hirsute beneath, the segments lanceo nate to subelliptie, usually aeute: stami- 
nate eU saucer- shaped, 1-1.5 mm. high: i 4-4.5 mm. lon the body 
obovoid, often broadly. rather ine -beak ed, with 5-7 dd dde I 
c: artemisiifolia Fl. S.]—(Ro yu Woratwoop. 
EED.)—Dry soil, den E prairies, pinelands, and cult. grounds, various 
OE N. C. to Tex., Calif., Wash., and N. S.—(W. I.)—Spr.-fall 
Rugeli Rydb. Stem 1 m. tall or less, ne hirsute: leaf-blades pin- 
5. A. 
natifid or partly nd hispidulous and strongly ir the Sur | 
. high: 
ovate to PEE: te: staminate involucre shallowly cupulat 1.5- 2 
fruit 4-4.5 mm. long, the body Pr short- d e with 5 or 6 pen DH 
or tubercle- like spines.—Sand-dun and pin elands, Coastal Plain, Fla. and 
Sum.—fall.—The short- ‘petioled. or sessile ee turn dark in dr rying. 
A. hispida Pursh. Stem and branches prostrate, creeping, several m. long 
or less, white hirsute or hispidulous: leaf-blades pares broadly ovate in 
outline, the segments divergent, ovate to obovate, obtuse or merely ae 
staminate involucre cupulate, about 2 mm. m. high: E 3.5—4 mm. long, the body 
veinlv, denne. short- beaked, with 1-5 unequal short-conic spines, 
w e in tal dunes, Pla— (W. I, Mez., C. A., S. A.)—AIl yea 
Often efficacious as a sand-binder 
7. A. trifida L. Stem 5 m. tall or less, wood d Or od leaf- pes 
except sometimes those of the upper ones, 3- or 5-lobed, mostly 1-3 dm. long; 
a ovate to la ene pen serrate: sta minat te soe saucer-shaped, mE l 
high: fruit 7-8 mm. long, the body broadly obovoid, with 6 or 7 ridges 
iuh end in short-conie spines, stout-beaked.— (GREAT-RAGWEED. HORSE-CANE.) 
—River- Lape z Lina and waste-places, various provinces, Fla. to Tex., 
Colo., B. C., —Sum.—fall.—Plants ce juvenile main stem is cut off, 
pr oduce e i ‘blades. 
8. A. aptera DC. Stem 5 m. tall or less, scabrous: leaf-blades, except some of 
the upper ones, 3- or 5-lobed, the lobes lanceolate to ov | coarsely serrate or 
unev in toothed: staminate pu saucer- pu d about 1 mm. high: fruit 
5-6 mm. long, the body obovoid, h 4-8 ridges which 2 in “tubercle -like 
Ne pou aked.—Low grou aad a wet places, various provinces, Miss 
to Ariz.—Sum.-fall.—In this and the next preceding species, the staminate in- 
voluere and corollas are black-streaked. 
FRANSERIA Cav. Anualor perennial eaulescent herbs, or low shrubs: 
leaves mos or opposite: blades toothed or dissected. Heads in spikes or 
