438 



COMPOSITAE. 



[Vol. III. 



5. Bidens bidentoides (Nutt.) Britton. 

 Swamp Beggar-ticks. (Fig. 3942.) 



Diodoiila bidentoides Nutt. Trans. Am. Phil. Soc. 



(11)7:361. 1841. 

 Coreopsis bidentoides T. & G. Fl. N. A. 2; 339. 1842. 

 li. bidentoides Br'Mon, Bull. Torr.Club, 20:281. 1893. 



Closely resembles />'. connala, glabrous 

 throughout; stem branched, i°-4° high. 

 Leaves similar, lanceolate, sharply serrate, 

 pctioled, or the upper sessile and entire, acumi- 

 nate at the apex, narrowed at the base; invo- 

 lucre narrowly or becoming somewhat broadly 

 campanulate, its outer bracts linear, foliaccous, 

 not ciliate, usually much exceeding the oblong 

 inner ones; rays none, or rarely present and 

 very short; acheueslinear-cuneate, 4"-5" long, 

 their sides and the 2 slender pappus-awns 

 (rarely with 2 short intermediate awns) up- 

 wardly barbed or hispid. 



Muddy shores of the Delaware River and Bay in 

 Pennsylvania, New Jersey, Delaware and Maryland. 

 Aug. -Oct. 



6. Bidens discoidea (T. &. G.) Brit- 

 ton. Small Beggar-ticks. (Fig. 3943-) 



Coreopsis discoidea T. & G. Fl. N. A. 2: 339. 1842. 

 JJ. discoidea Britton, Bull. Terr. Club, 20: 2S1. 1893. 



Annual, glabrous, slender, branching, erect, 

 2'-6° high. Leaves membranous, very slcnder- 

 petioled, all the lower ones divided into 3 lan- 

 ceolate or oblong-lanceolate, dentate, acuminate 

 segments which are I'-j' long; uppermost 

 leaves commonly rhombic-lanceolate and undi- 

 vided; heads usually numerous, slender-pedun- 

 cled, 2"-5" broad and about as high; involucre 

 broadly campanulate or hemispheric, its outer 

 bracts usually foliaceous and obtuse, usually 

 much surpassing the inner ones; rays appar- 

 entlj' always wanting; achenes eat, narrowly 

 cuneate, upwardly strigose, about 2" long; 

 pappus of 2 short, upwardly hispid, rarelj- down- 

 wardly barbed awns. 



In swamps and wet places, Connecticut to Virginia, 

 Ohio, Michigan, Louisiana and Texas. July-Sept. 



Beggar-ticks. 



3944-) 



to Florida, 

 Called also 



British 

 Rayless 



7. Bidens frondosa L. 



Stick-tight. (Fig, 



Bidens frondosa L. Sp. PI. 832. 1753. 



Annual; stem erect, branched, sparingly pu- 

 bescent,orglabrous,often purplish, 2'-9H° high. 

 Leaves thin, but not membranous, slcnder-peti- 

 oled, pinnatel)- 3-5-divided or the uppermost 

 undivided, the segments lanceolate or oblong- 

 lanceolate, sharply serrate, acuminate at the 

 apex, narrowed at the base, usually slightly pu- 

 bescent beneath, stalked, 2'-4' long, .'i'-i' 

 wide; heads usually numerous, pcduncled, 

 about 6" high, 5"-io" broad; involucre cam- 

 panulate, becoming hemispheric, its outer bracts 

 more or less foliaceous, often much exceeding 

 the ovate-lanceolate, scarious-margined inner 

 ones; rays none, or rudimentary and inconspic- 

 uous; achenes flat, oval or obovate, ciliate, the 

 two sleuder awns downwardly barbed, or some- 

 times upwardh' hispid. 



In moist soil, often a weed in fields. Nova Scotia 

 Columbia, Nebraska and Texas. Introduced as a weed into southern Europe. 

 Marigold, Beggar-lice, Pitchforks, Stick-seed, Common Bur-marigold. July-Oct. 



