SUNFLOWER FAMILY 129 
2. Bidens laévis (L.) B.S.P. Bur-marigold. Fig. 5184. 
Helianthus laevis L. Sp. Pl. 906. 1753. 
Bidens chr rysanthemoides Michx. FI. Bor. <i 2: 136.:'1803, 
: el..C 
Bidens speciosa Parish, Zoe 5: 75. 1900. iy Gavia: 1845. 
Bidens expansa Greene, Pittonia 4: 266. 1901. 
Usually stout annual (or ple gael a mir ab gran base), up to 1 m. high, — through- 
out; stems usually decumbent and r t base, simple or branched above. es lanceolate 
to elliptic- or obovate oblong, 4-22 cm aie Aen e, usually acuminate, ae a - 
scarcely connate at base, se or esr thickish, glabrous; heads show 
mostly leans or in threes at apex of stem and branches, often long-peduncled, at leneth pt na 
outer i tieting ries 6-9, us ate ren ir ly oblong, obtuse, hisp idulous-ciliolate, 2.5 cm. long or usually 
muc bigs ey equaling the rays, ten he 46 reflex ; disk golden- ville ow; rays usually 8, oval- 
pees , 23 ¢ ao om A scapend yellow, cae _deeper- colored at base; receptacular bracts usually 
an oe ‘brown enes narrowly cu e, 5-8 mm. ‘ata usually i and flat, sometimes 
Bt 1- ar ac on gone face, harshly ee hispidulous on margin, often also on faces 
(4). retrorse-hispid, 2.2-3 mm. long. 
Streambanks, swamps, and sloughs; the Pacific States in the lower Sacramento Valley, California, south- 
ward in the San Joaquin Valley je | onl Tr Ranges to southern Calileeaiad gi ey ot from Mexico to 
South America; on the eastern seaboard from New rap dae south to southern United States. Type locality: 
Virginia. July—Dec. Often date ae wr aet CA with difficulty from B. cernua. 
Bidens tripartita L. Sp. Pl. 831. 1753. A cosmo slits annual weed with petioled, tripartite or deeply 
serrate leaves, with rayless or short-rayed heads, and outer enlarged ae ap pet has been collected on 
ballast at Portland, Oregon, and at Bingen, Klickitat Cou nty, Washin wher was collected ‘es Suksdorf, 
Type locality: described from a cultivated specimen in Hol i 
ns amplissima Greene, Pittonia 4: 268. 1901. (Bidens cernua B elata Torr. be! ae eh Am 
352. 1842.) “Fall, peut annual with large, sessile, pinnately tripartite Ndeeh: the ost enti ire; outer 
a foliaceous, a , and coarsely incised. Known only from Vancouver ileal. “British Columbia. 
May be expected to occur in adjacent Washington. Type locality: Lomas River, Vancouver Island. 
3. Bidens frond6ésa L. Stick-tight. Fig. 5185. 
— frondosa L. Sp. Pl. 832. 1753. 
s melanocarpa Wiegand, Bull. Torrey Club 26: 405. 1899. 
1 m. high, stem slender, branching, sparsely pilose to essentially glabrous. 
ss, inate e,c te at base, ply serrate, thin, sparsely pubescent 
to nearly glabrous, the 1 1 short-stiped or subsessile, the terminal long-stiped; heads discoid 
or inconspicuously radiate, sol few and irregularly cy cies t of stem and branches; 
disk m. hi about as thick; outer phyllaries 5-8, spa or oblanceolate, 
long, acute, remotely ciliate; inner phyllaries ovate l bout equaling the di 
in young flower; fl rs golden-yellow, the rays when present et. = i og 
chenes cuneate or narrowly eate-obovate, 5-10 long, antrorse-ciliate 
a ea 
at least below the apex (sometimes retrorse-ciliate above), aauatle wane piloe on the face, 
mire awns 2, Lagat oe 4 mm. long or les 
Moi n places, frequently occurring as a weed; eastern Canada west to British Columbia and south to 
Colorado, Losisihon. ae Florida; oceasiona al i ao We shington, Ore egon, and Gabivente as far south as the San 
o Mountains; also introduced in > psn Type locality: “America.” July—Oct. 
5184. Bidens laevis 5185. Bidens frondosa 
