[9 6 



COMPOSIT \K 



Vol. III. 



3. Bidens connata Mulil. Purple-stemmed 



Swamp Beggar-ticks. Fig. 4507. 



nata Muhl. ; Willd. Sp. PI. 3: 1718. 1804. 



Annual; glabrous throughout; stem erect, usu- 

 ally branched, 6'-8 high, purple. Leaves peti- 

 oled, lanceolate or oblong lanceolate, sharply and 

 coarsely serrate, thin. 2'-$' long, l'-i' wide, apex 

 innate, base tapering, the uppermost some- 

 times sessile, nearly entire and acutish, the lowi 1 

 sometimes with a pair of basal lobes, decurrent 

 on the petiole; heads several or numerous, pe- 

 duncled, h'-l broad; involucre campanulate or 

 hemispheric, the outer bracts somewhat exceed- 

 ing the ovate-oblong, inner ones; rays none, or 

 1-5 and inconspicuous; disk-flowers orange; 

 achenes cuneate or obovate, hairy and tubercled. 

 or nearly glabrous, keeled, or angled, 2" -3" long, 

 the margins with either erect or retrorse hairs, 

 or both, the 2-4 pappus awns downwardly barbed, 

 half as long as the achene. 



In swamps or moist soil, Rhode Island to Ontario, 

 Minnesota, Delaware, Georgia, Kentucky, Missouri 

 and Nebraska. Introduced into Europe. Cuckold. 

 Harvest-lice. Pitchforks. Aug. -Oct. 



4. Bidens comosa (A. Gray) Wiegand. 

 Leafy-bracted Tickseed. Fig. 4508 



B. connata var. comosa A. Gray, Man. Ed. 5, 261. 1867. 

 B. comosa Wiegand, Bull. Torr. Club 24: 436. 1897. 

 B. riparia Greene, Pittonia 4: 261. 1901. 

 B. acuta (Wiegand) Britton, Man. 1001. 1901. 



Annual, glabrous; stem erect, branched, 6'-4i 

 high, straw-colored. Leaves short-petioled, or sub- 

 sessile, lanceolate to elliptic-lanceolate, coarsely ser- 

 rate with mostly smaller teeth than in B. connata, 

 tapering to each end, the petioles broadly margined : 

 heads several or numerous, 1" ii" broad; outer 

 bracts of the involucre linear, spatulate or lanceo- 

 late, foliaceous, erect or spreading, often toothed. 

 2-4 times as long as the head; rays none; corollas 

 mostly 4-lobed, pale greenish yellow ; stamens and 

 style included; achenes larger, 3i"-sl" long, evenly 

 cuneate, very flat ; pappus awns commonly 3, down- 

 wardly barbed, somewhat shorter than the achene. 



In wet soil, Massachusetts to Illinois, North Dakota, 

 New Jersey, West Virginia, Kentucky and Kansas. 

 Leaves thicker and paler than in B. connata. Aug.-Oct. 



5. Bidens bidentoides (Nutt.) Britton 

 Swamp Beggar-ticks. Fig. 4509. 



Trans. Am. Phil 



Diodonta bidentoides Nutt 



(II) 7: 361. 1841. 

 Coreopsis bidentoides T. & G. Fl. N. A. 2 

 B. bidentoides Britton, Bull. Torr. Club 20 



Soc. 



339- 1842. 

 281. 1893. 



Closely resembles B. connata, glabrous through- 

 out; stem branched, i-4 high. Leaves similar, 

 lanceolate, sharply serrate, petioled, or the upper 

 sessile and entire, acuminate at the apex, nar- 

 nowed at the base ; involucre narrowly or be- 

 coming somewhat broadly campanulate. its outer 

 bracts linear, foliaceous, not ciliate, usually much 

 exceeding the oblong inner ones; rays none, or 

 rarely present and very short ; achenes linear- 

 cuneate, 3"-S" long, their sides and the 2 slender 

 pappus awns (rarely with 2 short intermediate 

 awns) upwardly barbed or hispid. 



Muddy shores of the Delaware River and Bay in 

 Pennsylvania, New Jersey, Delaware and Maryland. 

 Aug.-Oct. 



