Jepson eFlora
Key to families | Table of families and genera

Key to Bidens

View taxon page for Bidens

(For a list of species in Bidens, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Leaf simple

2. Leaf petioled ..... B. tripartita

2' Leaf sessile

3. Fruit with ± thickened margin, prominently ribbed; palea tips yellow; ray 0 or < 15 mm ..... B. cernua

3' Fruit without thick margin or prominent ribs; palea tips ± red; ray 15–30 mm ..... B. laevis

1' Leaf pinnate

4. Fruit narrowly cylindric or slightly compressed, 4-angled ..... B. pilosa

4' Fruit wedge-shaped, flat

5. Outer phyllaries 5–8; inner phyllaries = disk ..... B. frondosa

5' Outer phyllaries 10–16; inner phyllaries < disk ..... B. vulgata


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.