Comparison of Bidens amplissima and Bidens cernua

A comparison of Bidens amplissima and Bidens cernua

using scanned UBC Herbarium specimens.

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Bidens amplissima (tri-lobed leaf form) Bidens amplissima (unlobed leaf form)
(Note: two collections on one sheet)

Bidens amplissima (unlobed leaf form) Bidens cernua

Achenes from adjacent
B. cernua.

Bidens amplissima
(redetermined from B. cernua)

Bidens cernua (redetermined from B. amplissima)
from Somenos Marsh (CDC specimen)

Note the differences in achene size, the number of awns, and achene summits (cernua--convex, amplissima--concave).

Bidens amplissima achenes (detail from redetermined B. amplissima sheet above) Achene comparison between B. cernua and B. amplissima (achenes were taken from both tri-lobed and unlobed leaf forms)

Page created by B. Klinkenberg Nov 15, 2001.


Bidens amplissima (tri-lobed leaf form)	Bidens amplissima (unlobed leaf form) (Note: two collections on one sheet)

Bidens amplissima (unlobed leaf form)	Bidens cernua
		Achenes from adjacent B. cernua.
Bidens amplissima (redetermined from B. cernua)	Bidens cernua (redetermined from B. amplissima) from Somenos Marsh (CDC specimen)


		Note the differences in achene size, the number of awns, and achene summits (cernua--convex, amplissima--concave).
Bidens amplissima achenes (detail from redetermined B. amplissima sheet above)	Achene comparison between B. cernua and B. amplissima (achenes were taken from both tri-lobed and unlobed leaf forms)