404 



Wiegaxd: Some Species oe Bidexs 



cussed in this paper. The flowering period is from Sept. i to 

 Oct. 15. 



2, Bidexs Discoidea (T. & G,) Britton, Bull. Torn Bot Club, 



20: 281. 1893. 



Corco/ysis discoidea T. & G. FI. N. A. 2: 339. 

 Stem tall and much 



1842. 



disk, commonly 4, not ciliate, glabrous ; inner bracts oblong- 



branched, slender, reddish : leaves 3- 

 foliolate, small, glabrous, petioles very slender (3 cm.), marginless ; 

 leaflets lanceolate to ovate-lanceolate, short (4-9 cm.), long-acumi- 

 nate, sharply and coarsely serrate below the entire point, abruptly 

 contracted at the base, the terminal on a long slender stalk (5-15 

 mm.), lateral slightly smaller on shorter stalks, uppermost leaves 

 sometimes undivided, dark-green : heads very small and numerous 

 (8-10 mm. broad), on very short peduncles (1-4 cm.), globular, 



outer involucral bracts linear to spatulate-linear, rarely longer than 

 the 



or elliptic-oblong, obtuse {6-y mm.), brownish, equaling the disk"; 

 chaff" commonly reddish tipped : ray flowers none : corolla of the 

 disk flowers very small (1.75-2 mm.), orange, equaling or slightly 

 longer than the awns, campanulate-oblong above, 5 -toothed, con- 

 tracted into a basal portion shorter than the upper : stamens slightly 

 exsertcd : mature achencs very small (4-5.5 n'»m.), rather narrow, 

 cuneate, contracted at the summit, biconvex, black, hairy, tuber- 

 culate-papillose or nearly smooth, margins upwardly hairy, sum- 

 mit truncate, awns 2, very sliort (scarcely longer than the breadth 

 of the achene), upwardly hairy. 



Massachusetts to North Carolina {Chapina)i) and westward to 

 Ohio, Louisiana and Texas. 



Specimens examined from : — Massachusetts : Stonv Brook Res, 



RiclL Connecticut, Wright, 1879. New York : Ithaca (many speci- 

 mens); Oswego Co., Wibbc, Roiclcc. New Jersey, Morris Co., 

 Porter, Pennsylvania: Luzerne Co., Heller^ no, 60. Delaware, 



Ca?d)j, 



]\Liryland, Canby, Ohio, Sullivant, 1839. Missouri 



Engcbnan}!. 



Arkansas, Lcttcnna?L Louisiana 



T 



Hale, 1842. 



Texas, Li)idJiei))icr^ Dntninuvid, 



This species is on the whole less common in the eastern por- 

 tion of its range than are most of the others, and judging from the 

 specimens cited above it must be quite rare in New England. \\\ 

 New York and Pennsylvania it is found only near sphagnous bogs 

 and mountain lakes, selecting preferably old logs and stumps that 

 project out Into the water. So far as observed it is quite constant 



