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

Key to Caulanthus

View taxon page for Caulanthus

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

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

1. Cauline leaves petioled or occasionally ± , bases not lobed or 

2. Perennial herb with woody glabrous or sparsely hairy

3. Stem strongly inflated ..... C. crassicaulis

3' Stem not inflated (± inflated)

4. Basal leaves not rosetted;  5–35 mm; stigma   septum margins ..... C. glaucus

4' Basal leaves rosetted; pedicel 1–6 mm; stigma lobes opposite valves ..... C. major

2' Annual or biennial (short-lived  herb), woody caudex 0; glabrous or moderately to densely stiff-hairy proximally.

5. Sepalspetalsstamens widely filaments ± equal in length ..... C. anceps

5' Sepals, petals, stamens  (sepals  to spreading); filaments in 2 or 3 pairs of unequal length

6. Petals 2.5–5(6.5) mm, neither channeled nor wavy-margined, undifferentiated into  and clawcalyx not  ..... C. lasiophyllus

6' Petals (6)8–17.5 mm, channeled, generally wavy-margined, well differentiated into blade and claw; calyx generally urn-shaped

7. Petals ± white or ± purple; seeds 152–198 ..... C. pilosus

7' Petals creamy white (pink); seeds 44–96

8. Stamens 4 long, 2 short; fruit 3.8–7.7 cm; seeds 44–58 ..... C. flavescens

8' Stamens in 3 pairs of unequal length; fruit 6.5–12.5 cm; seeds 78–96 ..... C. hallii

1' Cauline leaves sessile, bases lobed, sagittate, or clasping

9. Stem much inflated, to 4 cm wide ..... C. inflatus

9' Stem not inflated

10. Fruit flat perpendicular to septum; seeds ± spheric ..... C. californicus

10' Fruit , flat parallel to septum, or 4-sided; seeds ovoid to 

11. Inflorescence with a terminal cluster of sterile flowers; stamens in 3 pairs of unequal length, filaments of upper or lower pairs fused

12. Fruit  (spreading);  hairs 2-rayed  and cotyledons deeply 3-lobed; stigma lobes 0.5–1.5 mm ..... C. coulteri

12' Fruit erect to ascending; leaf hairs simple; cotyledons ; stigma lobes 1–4 mm ..... C. lemmonii

11' Inflorescence without a terminal cluster of sterile flowers; stamens generally 4 long, 2 short, filaments free

13. Plant glabrous throughout; stamens in 3 pairs of unequal length; fruit spreading to ascending ..... C. amplexicaulis

13' Plant hairy at least basally; stamens 4 long, 2 short; fruit reflexed (spreading)

14. Hairs 0 or , 2-rayed; distal stem generally wavy, generally weak ..... C. cooperi

14' Hairs spreading, simple; stem straight, rigid

15. Fruit flat parallel to septum or 4-sided; cauline leaves lance-linear ..... C. heterophyllus

15' Fruit cylindric; cauline leaves  to oblong ..... C. simulans


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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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