498 COMPOSITAE. Vor. 117. 
g. Bidens bipinnata L. Spanish Needles. 
Cuckolds. Fig. 4513. 
Bidens bipinnata L. Sp. Pl. 832. 1753. 
Annual; stem quadrangular, erect, freely branch- 
ed, rather slender, 1°-5° high. Leaves thin, acumi- 
nate, petioled, 1-3-pinnately dissected into ovate or 
oblong, toothed or lobed segments, the lower often 
8 long; heads usually numerous, long-peduncled, 
2-4” broad; involucre narrow, its outer bracts 
linear, ascending, nearly as long as the broader erect 
inner ones; rays 3-4, yellow, short, sometimes none; 
achenes linear, 4-angled, slightly pubescent, narrowed 
upward into a beak, 5’-9” long, the outer ones com- 
monly shorter and thicker than the inner; pappus 
of 2-4 (usually 4), downwardly barbed, slightly un- 
equal, spreading awns, much shorter than the achene. 
In various situations, often a weed in cultivated fields, 
Rhode Island to Florida, Ohio, Nebraska, Kansas and 
Arizona. Introduced as a weed into southern Europe 
and Asia. July—Oct. 
10. Bidens coronata (L.) Fisch. Southern 
Tickseed-Sunflower. Fig. 4514. 
Coreopsis coronata L, Sp. Pl. Ed. 2, 1281. 1763. 
Coreopsis aurea Ait. Hort. Kew. 3: 252. 1789. 
Bidens coronata Fisch. ; Steudel, Nom. Ed. 2, 202. 1840. 
Annual, glabrous or nearly so throughout; stem 
branched, 1°-3° high. Lower leaves petioled, 3-5’ 
long, 3-divided, the terminal segment lanceolate, acute 
or acuminate, serrate, much larger than the serrate 
or entire lateral ones; upper leaves much smaller, 
.3-parted, 3-lobed or undivided, sessile or short- 
petioled, entire or serrate; leaves rarely all undi- 
vided; heads numerous, slender-peduncled, 1’-2’ 
broad; involucre hemispheric, its outer bracts linear- 
oblong, obtuse, equalling or slightly exceeding the 
broader inner ones; rays 6-10, obtuse; achenes 
broadly cuneate, slightly pubescent, 1-2” long; pap- 
pus of 2 chaffy blunt divergent somewhat laciniate 
teeth, rarely with 2 shorter intermediate ones. 
In wet places, Virginia to Florida and Alabama. July- 
Sept. 
11. Bidens trichospérma (Michx.) Britton. 
Tall Tickseed-Sunflower. Fig. 4545. 
C. trichosperma Michx. Fl. Bor. Am. 2: 139. 1803. 
B. trichosperma Britton, Bull. Torr. Club 20: 281. 1893. 
Coreopsis trichosperma var. tenuiloba A. Gray, Syn. Fl. 
1: Part 2, 295. 1884. 
Bidens trichosperma tenuiloba Britton, Bull, Torr. Club 
20: 281. 1893. 
Annual or biennial, glabrous; stem tall, obscurely 
quadrangular, much branched, 2°-5° high. Lower 
leaves petioled, 4’-8’ long, pinnately divided into 5-7 
lanceolate or linear, acuminate, sharply serrate, in- 
cised or nearly entire, sessile or short-stalked seg- 
ments; upper leaves sessile or nearly so, 3-lobed, 
3-divided, or entire and linear-lanceolate; heads nu- 
merous, 14-24’ broad, long-peduncled; involucre 
hemispheric, its outer bracts linear or spatulate, 
sometimes ciliate, about the length of the broader 
inner ones; rays 6-19, obtuse, golden yellow, 7-12” 
long; achenes oblong-cuneate or the inner ones nar- 
rower, hispid-pubescent and ciliate, 2’-4” long; pap- 
pus of 2 short erect or divergent, upwardly hispid 
teeth or short awns. 
In swamps and wet meadows, Massachusetts to Georgia; Illinois to Michigan and Kentucky. 
Recorded from Ontario and Minnesota. Aug.—Oct. 
