840 



COMPOSITAE (COMPOSITE FAMILY) 



990. B. bidentoides. 



991. B. Eatoni. 



992. B. Eat., 

 v. fal. 



993. B. discoidea. 



hairy, 1 em. or more long, with 2 very slender upwardly 

 roughened awns (6-8 mm. long} surpassing the yellowish 

 ^-toothed corolla, and often 2 minute intermediate teeth. 

 ( Coreopsis Nutt.) Shores of Delaware R. and 

 Bay. Sept., Oct. FIG. 990. 



2. B. Eatbni Fernald. Simple or branched, 

 2.5-6 dm. high ; leaves lanceolate, with long- 

 acuminate tips and slender petiolar bases, 

 coarsely serrate ; outer involucre of 3-5 bracts, 

 inner of 5 oblong conspicuously striate ones 1 cm. long ; rays 

 none ; disk-flowers 15-25 ; inner achenes 7-9 mm. long, 1-1.7 

 mm. broad, with strong midribs, usually with retrorse hairs on 



the margin ; the 2-4 awns 3-4.5 mm. long, downwardly barbed. 

 Brackish shores, lower Merrimac R., Mass. Sept., Oct. FIG. 991. 

 Var. FALLAX Fernald. Achenes and awns upwardly 

 oarbed. With the typical form. FIG. 992. 



3. B. discoidea (T. & G.) Britton. Diffusely 

 branched ; leaves ternately divided, slender-petioled ; 

 leaflets ovate-lanceolate, pointed, coarsely serrate ; 

 heads small, 5 mm. high ; outer involucral bracts 

 usually 4 ; achenes linear-wedge-shaped, tuberculate or smooth, 

 bearing a pair of short and stout upwardly barbed awns of the 

 length of the orange 5-toothed corolla. (Coreopsis T. & G.) 

 Wet banks and swamps, Mass, to Mich., 111., 

 southw. and southwestw. July-Oct. FIG. 993. 



4. B. frondbsa L. (BEGGAR-TICKS.) Stems tall (7 dm. or 

 less in height), paniculate-branched ; leaves 3-5-divided, gla- 

 brous, the terminal leaflet long-stalked, acuminate, often again 

 divided, lateral ones shorter, less acuminate, all sharply serrate ; 

 heads 1.5 cm. long or less, on slender peduncles; 

 outer involucre of 5-8 ciliate bracts; rays small, 

 yellow; achenes narrowly cuneate, 7-10 mm. long, 

 black, strongly 1-nerved on each face, often slightly 

 994. B. frondosa. hairy, the retrorsely barbed slightly divergent slender 

 awns barely half as long, exceeding the 5-toothed 

 orange corolla. (B. melanocarpa Wiegand.) Common in damp 

 ground, throughout. Aug., Sept. FIG. 994. Var. ANOMALA Porter. 

 Awns upwardly barbed. Local, N. S. to Pa. FIG. 995. 



5. B. vulgata Greene. (BEGGAR-TICKS, STICK-TIGHT.) Stem tall (often 

 1.5 m. high) and branching, glabrous ; leaves pinnately 3-5-divided, slender- 

 petioled, nearly glabrous ; leaflets lanceolate, very acute, coarsely serrate, all 



short-stalked; heads large, 1.5-2.5 cm. broad, stout-peduncu- 

 late; outer involucral bracts 10-16, unequal, about equaling the 

 disk or sometimes longer, coarsely ciliate-hispid ; rays pale 

 yellow ; achenes 9-12 mm. long, obovate- or oblong -cuneate, 

 usually glabrous, but often tuberculate-roughened, brown or 

 olive; awns retrorsely barbed, exceed- 

 ing the 4-5-toothed yellow corolla. (B. 

 996. B. vulgata. frondosa Wiegand, not L.) Moist 

 waste places and roadsides, throughout, 



but less common eastw. than the preceding. Aug. -Oct. 



FIG. 996. 



Var. pubSrula (Wiegand) Greene. Peduncles, leaves, 



and outer bracts puberulent. Wise, to Sask. and Mo. 



6. B. com&sa (Gray) Wiegand. Stem stout, 8 dm. or 

 less in height, glabrous ; branches short ; leaves pale, 



elliptic, acute, with winged petioles, regularly serrate, or upper entire ; heads 

 few, large, 1 cm. or so high, short-pedunculate ; outer involucre of 6-8 nearly 

 erect linear or lanceolate usually entire unequal large bracts, the longest 2-5 

 times exceeding the disk ; rays wanting achenes about 1 cm. long, cuneate, 



f 

 '' 



997. B. comosa. 



