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

Key to Onagraceae

View taxon page for Onagraceae


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

1. Sepals persistent after flower; flower parts in (3)4–5(7)s;  0 ..... LUDWIGIA

1' Sepals deciduous after flower (along with other flower parts); flower parts in (2)4s; hypanthium present, often elongate, or if 0 then petals rose-purple to pink, rarely white, or flowers 

2. Stipules present, occasionally deciduous; fruit , bur-like with hooked hairs; flower parts in 2s; stigmas maturing before anthers ..... CIRCAEA

2' Stipules 0; fruit generally  capsule, rarely indehiscent but not bur-like; flower parts in (3)4s; anthers generally maturing before stigmas

3. Seeds hair-tufted (tufts rarely secondarily lost); sepals ; stigmas dry with multicellular papillae

4. Leaves generally ; hypanthium 0; petals stamens ± equal, in 1 whorlpollen blue-gray, grains shed singly ..... CHAMERION

4' Leaves  at least at base; hypanthium 0.3–34 mm; petals notched; stamens in 2 unequal whorls; pollen cream, grains generally shed in 4s ..... EPILOBIUM

3' Seeds not hair-tufted; sepals ; stigmas mainly wet and nonpapillate or with dry unicellular papillae

5. Stigma 4-lobed, dry, papillae unicellular; anthers generally maturing before stigmas ..... CLARKIA

5' Stigma hemispheric or 4-lobed, wet, papillae 0; anthers not maturing before stigmas

6. Fruit 2-chambered; stems slender, hair-like ..... GAYOPHYTUM

6' Fruit (3)4-chambered; stems generally not slender

7. Seeds with concave and convex sides, concave side with thick , both sides densely covered with club-shaped hairs; petals white, base yellow ..... CHYLISMIELLA

7' Seeds generally not concave and convex, wing 0, club-shaped hairs 0; petals yellow, purple, red, or white, if white, generally lacking yellow base

8. Ovary tip projection 0.4–18 cm; stem 0

9. Perennial herb; fruit cylindric-ovoid, ± straight or slightly curved, ± angled to nearly smooth, lacking pointed wing near center top of each , walls generally thin, distended by seedssterile projection of ovary persistent with fertile part in fruit, without abscission line at juncture between hypanthium and fertile part of ovary ..... TARAXIA

9' Annual; fruit irregularly obovoid, sharply 4-angled with pointed wing near center top of each valve, thick walled, not distended by seeds; sterile projection of ovary with clear abscission line at juncture between short hypanthium and fertile part of ovary ..... TETRAPTERON

8' Ovary tip projection 0, occasionally ± tapering; stem generally present

10. Stigma 4-lobed ..... OENOTHERA

10' Stigma hemispheric to spheric or 

11. Seeds in 2 rows per chamber; fruit pedicelled; leaves often ± pinnately lobed with large terminal , occasionally either lateral  ± reduced or  ovate-cordate and long-petioled; abaxial leaf surface or margin with conspicuous (brown) oil cells ..... CHYLISMIA

11' Seeds in 1 row per chamber; fruit  or occasionally short-pedicelled (Camissonia kernensis); leaves generally not predominately basal, entire to pinnately lobed and if so then terminal lobe not conspicuously larger than lateral; leaf oil cells 0

12. Petals white, pink, or rarely red; flowers night-blooming ..... EREMOTHERA

12' Petals yellow, often with red flecks; flowers day-blooming

13. Flower stems wand-like; leaves pinnately lobed to occasionally entire; petals yellow with red flecks near base; seeds generally with purple spots; hypanthium with lobed disk ..... EULOBUS

13' Flower stems not wand-like; leaves entire to toothed; petals yellow, occasionally with 2 red spots at base, or white; seeds without purple spots; hypanthium without lobed disk

14. Distal stem densely leafy, proximal stem nearly leafless; branches many, slender,  from base of pl; fruit strongly flattened, straight, 0.5–1 cm ..... NEOHOLMGRENIA

14' Stem generally leafy throughout, branched throughout or with a few basal branches; fruit cylindric to quadrangular, not flattened, often wavy or curled, (0.8)1–6 cm

15. Fruit ± cylindric; plants flower from distal ; leaves generally  to narrowly ; seeds glossy, triangular in ×-section, often < 1 mm ..... CAMISSONIA

15' Fruit 4-angled, at least when dry; plants generally flower from basal nodes; leaves generally narrowly , narrowly elliptic or ; seeds dull, often > 1 mm, flattened ..... CAMISSONIOPSIS



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 .

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