April, 1905.] Notes — Ohio State Herbarium. III. 317 



5. Some of the outer bracts twice as long as the disk or longer, the longest 



20-75 mm. long. 5. B. comosa. 



6. Rays none or very short. 7. 

 (i. Rays large and conspicuous, bright yellow. 8. 



7. Outer involucral bracts 4, achenes about 5 mm. long. (i. Fi. discoidea. 

 7. Outer bracts 6-8, achenes 6-8 mm. long. 7. B. frondosa. 



7. Outer bracts 10-16, achenes 7-10 mm. long. 8. B. vidgata. 



8. Achenes cuneate, the short awns narrowly triangular, upwardly 



hispid. i). Fi. trichospcrma. 



8. Achenes cuneate to obovate, the slender awns two-thirds the length 



of the achene or more, barbed. 10. B. aristosa.. 



1. Bidens bipinnata L. Stem much branched, 3-8 dm. high. 

 Leaves slender petioled, ovate, 1-8-pinnately parted, segments 

 ovate, deeply toothed or lobed. Heads long peduncled, 10-20- 

 flowered, involucre oblong, 7-10 mm. high; achenes linear, four- 

 sided, narrowed above, 7-15 mm. long, exclusive of the usually 

 fottr downwardly barbed awns. 



In shaded places throughout the state. 



2. Bidens cernua L. Stem sparingly branching above or 

 sometimes from the base, 2.5-4.5 dm. high. Leaves oblong, 

 about 1 cm. wide, acuminate, finely and regularly serrate except 

 at the apex and base, cordate-clasping or connate. Heads few 

 to several, erect in flower, nodding in fruit, about cS mm. high, 

 outer bracts equalling or exceeding the disk; achenes four-angled, 

 cuneate, 4-5 mm. long, awns four, 2-3 mm. long, retrorsely barbed. 



Specimens are in the State Herbarium from Cuyahoga, 

 Geauga, Lucas, Madison, Mercer, Perry and Wayne Counties. 



3. Bidens elliptica. (Wiegand). Bidens cernua elliptica 

 Wiegand, Bull. Torr. Club 26:417. 1899. Stem erect, usually 

 freely branching above or sometimes from the base, 3-8 dm. 

 high. Leaves elliptical, typically 12-15 cm. long by 2-3 cm. wide, 

 sharply serrate along the middle, long acuminate and conspic- 

 uously narrowed toward the sessile or barely connate base. 

 Heads very ntimerous, nodding in fruit, outer bracts exceeding 

 the disk, ray flowers usually present and conspicuous; achenes 

 cuneate, 5-6 mm. long, awns four, retrorsely barbed. 



Abundant in wet places along streams, apparently through- 

 out the state. 



Bidens elliptica is one of the commonest members of the 

 genus occurring in Ohio. However, it has never before been 

 definitely reported from the state, probably l)ecause it is not 

 described in the current manuals, where it is included under 

 Bidens cernua. When its identity has been recognized it has 

 been frequently confused with Bidens laevis, a coastal plain spe- 

 cies with persistently erect heads, not found farther inland than 

 central New York. Although originally described bv Wiegand 

 as a variety of Bidens cernua, its stouter and branching habit, 

 the numerous heads, the brighter green and larger leaves with 



