130 COMPOSITAE 
4. Bidens vulgata ecg Western Stick-tight. Fig. 5186. 
Bidens vulgata Greene, Pittonia 4: 72. (July) 1 
Bidens frondosa var. puberula Wiegand, Bull. akan pine 26: 408. (Aug.) 1899. 
Bidens vulgata var. puberula Greene, Pittonia 4: 250. 19 
Annual, similar to B. frondosa but coarser aA taller ; terminal division of leaves often short- 
stiped; heads larger, the gs in fruit 1.3-2.5 cm thick; outer phyllaries 10-16, densely hirsute- 
—— oe merely pubescent or Sera vet up to 5.5 cm. long; corolla yellow; achenes broadly 
siceehies -cuneate, 6-12 mm. long, 2. mm. wide, usually merely antrorse-ciliolate, on 
Pieie ti pubescent or nearly ae aati yellowish or olive- brown ; awns 2, retrorse-hispid, 5 m 
ong or les 
Moist inser and roadsides; — southward to North Carolina and Missouri and westward to Was ee, 
Oregon, and in California in the | ramento Valley, prow it apparently is introduced; also adventive in Euro 
Type locality: not given. June—Oct. 
5. Bidens pilésa L. Beggars-ticks. Fig. 5187. 
Bidens pilosa L. Sp. Pl. 832. 1753. 
Bidens californica DC. Prod. 5: 599. 1836. 
ender prs branched chiefly above, up to 1.3 m. high, stem striate- -angled, sparsely epi 
or hi rsute to arly glabrous, with long internodes. Leaves slender-petioled, pinnately 3-5-p 
the divisions greed -oblong to ovate or rhombic-ovate, crena iearregte to ‘incised, ee Fa 
long-stiped ; head -flowered, solitary or few and irregularly cymo e em a 
branches, 6-8 mm. thick in flower, 1-2 ick in fruit; outer phyllaries 6-8, linear or spatulate, 
about 3.5 mm. long, ciliate especially above, shorter than the inner; disk yellow; rays none or few, 
sh 
small, yellowish white; acher inear or linear-fusiform, 5-13 mm. long, act a A or sub- 
ua 
le 
outer much shorter than the inner; awns 2-4, erect ~ Duties about 2 mm. ay naked below 
auoedlng “hispid for about the upper half of their gue 
abt praia eed in waste places and cultivated ground; na of the American tropics, of — many fom 
segre Betray occurring - eee ia from Monterey ae psa Counties south into Arizona and Mex 
mye focality: “America.” March—Oct 
6. Bidens béckii Torr. Water Marigold. Fig. 5188. 
Bidens beckii Torr. ex Spreng. Neue Entdeck. 2: 135. 1821. 
Megelodente beckis Greene, Fittonia 4: 271. 1901 
272. 
Megalodonta beckti var. oregone 5 Rhee ff, Bot. Gaz. 97: 609. 1936. 
Megalodonta beckii var. henditsens Sherff, Amer. Journ. Bot. 25: 589. 1938, 
Aquatic to glabrous throughout, the stems floating o r rarely emersed, simple or few- 
branched above o 2 m. long or more. Submersed leaves sheers ile, 1.5-4 cm. long, 3-parted 
“ ‘ 
t oO n 
lee oe cad about 8, golden yellow, oblong-oval, 1-1:5 cm. long; ae linear, 1 cm. 
long, obcom ek. “quadrangular, striate-ribbed, gla brous, saliowish or gree rown; awns 
3-6, slender-subulat —2.3 cm. long, divergen t, rigid, somewhat unequal, silonte inside, naked 
below w, a nse sions no “hispidulous all around at tip for about one-fourth thei r length. 
akes, rivers, and mar Quebec to New Jersey west to Manitoba, Minnesota, and Mis 
Pacific State in Washington =~ g een where perhaps introduced by aquatic birds. Type ality. prt "Scher 
ork, pt. 
garden cosmos (Cosmos bipin s Cay. Te: ¥s:10: 7p) < plant with penree divided into linear, more 
or bag flfform he ee and with whites pcg or crimson-rayed fl s, may be found occasionally as an adven- 
13. COREOPSIS L. Sp. Pl. 907. 1753. 
Herbs p= 8 usually glabrous or nearly so. Leaves opposite or alternate, entire to 
dissect . Hes mall to medium, radiate, usually yellow, the rays sometimes with. purple- 
brown spot at % e disk sometimes purple-brown. Involucre hemispheric, double; 
a ‘Bhalaries Tscrate usually few (6-10), herbaceous, usually much shorter than the 
ree at base; i ore nu s, 2-seriate, equal, membranous, free, 
sea brown + grt es Receptacle flattish, the receptacular bracts membranous or s 
scarious, flat. Ray-flowers neutral or pistillate, their corollas ligulate, usually wedge- 
shaped, often scpihed or 3-5-lobed. Disk-flowers fertile, their corollas tubular, with sider 
tube and 5-toothed limb. Anthers bidentate or subentire at base. Styl e-branches tipped 
with a conical appendage or subtruncate. Achenes obcompressed, usually oblong or oval, 
tet or ohare usually ae Pappus se 2 teeth or awns ‘ never gages: barbed), 
te oricia peces 
