Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Wolffia

View taxon page for Wolffia

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

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

1. Tip of plant body , upper surface ± concave or flat – dead plant with brown cells ..... W. borealis

1' Tip of plant body rounded, upper surface ± convex (except Wolffia arrhiza)

2. Upper surface of vegetative plant body with a conical bump near center; dead plant with brown cells ..... W. brasiliensis

2' Upper surface of plant body smooth; dead plants without brown cells

3. Upper surface dark green, flat; stomates generally 15–100 ..... W. arrhiza

3' Upper surface transparent green, ± convex; stomates 1–10(30)

4. Plant body 0.8–1.3 mm, ± spheric, upper surface mostly convex, center flat ..... W. columbiana

4' Plant body 0.4–0.8 mm, longer than wide, upper surface barely convex throughout ..... W. globosa



Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, [accessed on ]

Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .

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.