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

Key to Lactuca

View taxon page for Lactuca

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

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

1. Fruit beak short, thick; biennial or  herb

2. Biennial from short taprootopen heads 1–1.5 cm diam; NW, n CCo ..... L. biennis

2' Perennial herb from long, deep ; open heads 2–3 cm diam; CaRH, c SNH, MP ..... L. tatarica subsp. pulchella

1' Fruit beak slender, thread-like; annual or biennial

3. Fruit with 1 median rib on each face

4. Open heads 5–10 mm diam; flowers 13–25 ..... L. canadensis

4' Open heads 4–5 mm diam; flowers 20–56 ..... L. ludoviciana

3' Fruit with 5–9 ribs on each face

5. Biennial;   leaves toothed or shallowly lobed; cauline leaves widely clasping ..... L. virosa

5' Annual; basal leaves generally 0 at flower; cauline leaves with narrow, , basal  clasping stem

6. Stems proximally  and arching upward or , 5–10(20) dm; leaves lance-linear,  or few-lobed, lobes  and inflorescence branches often  to axis; flowers 5–12 ..... L. saligna

6' Stems erect, 5–30 dm; leaves oblanceolate to oblong-elliptic or obovate in outline, margins prickly-toothed, sometimes also coarsely lobed; inflorescence branches often widely ; flowers 14–20 ..... L. serriola



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.