SYNGENESIA.— FRUSTRANEA. 31 1 



R. triloba : hispidly pilose ; stem paniculate ; 

 branches divaricate, many-flowered, leafy ; leaves 

 lanceolate, acuminate at each end, serrate ; the 

 lower ones 3-lobed ; leaflets of the calyx linear, 

 deflexed, as long as the ray. 



HAB. Mountains. Aug. — Sept. U. Stem 4 — 5 

 ft. high ; rays yell. ; disk dark purp. 



R. fulgida : stem hispid ; branches long, virgate, 

 1 -flowered ; leaves oblong-lanceolate, denticulate, 

 hispid, narrowed and slightly cordate at the base ; 

 calyx leafy, as long as the ray ; disk hemispheri- 

 cal ; chaff lanceolate. 



HAB. Mountain meadows. Aug. U . Stem 2 — 

 3ft. high; rays 12—14, yell. 



R. hiria : very hairy ; stem virgate, somewhat 

 branched, 1-flowered ; leaves spathulate, lanceo- 

 late, triply nerved, serrate, hairy ; scales of the 

 calyx imbricate, in a triple series, shorter than the 

 ray ; chaff obovate, acute. 



HAB. Mountains. Aug. U- Stem 2— 3 ft. high., 

 subsimp. ;fl. solit., yell.; rays 14. 



501. BIDENS. Burr-marygold. Compositor. 



. B. ccrnaa : flowers subradiate, cernuous ; exterior 

 calyx as long as the flower; leaves lanceolate, sub- 

 connate, dentate. 

 HAB. Ditches, Lc. Aug.— Oct. ®. Stem 1— 2 



ft. high ; rays yell., often wanting. 

 3. minima : leaves lanceolate, serrate, sessile ; flow/ 



era erect. 

 HAB. Low wet place?. Aug. Stem 4 — 8 tit. high ; 

 //. very small. 

 . B. chrysanthemoides : flower9 radiate, cernuous; 

 rays thrice as long as the nearly equal calyx: 

 leaves oblong, attenuate at each end, dentate, con 

 nate at the base, 

 i 1 AH. Wetplaces. Aug.— Oct. ©. Stem 1— 3 

 ft. high ; JL large ; rays 3, lanceol. 

 '. B. frondosa : flowers discoid ; exterior calyx six 

 time? as long as the flower; its leaflets ciliate at t ht 

 base; lower leaves pinnate ; upper ones tomato 

 lanceolate, 9errate. 



