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

Key to Calyptridium

View taxon page for Calyptridium

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

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

1. Perennial herbstyle thread-like, 2–4 mm, 

2. Inflorescence >= 2 per cauline leaves generally present; petals rose to white ..... C. monospermum

2' Inflorescence generally 1 per rosette; cauline leaves generally 0; petals white ..... C. umbellatum

1' Annual; style thread-like or not, generally < 2 mm, generally 

3. Style 1–2 mm; seeds 1–3, 0.7–0.9 mm; c SN ..... C. pulchellum

3' Style < 0.5 mm; seeds >= 4, 0.4–0.8 mm; widespread, including e slope SNH (for C. roseum) but otherwise excluding c SN (except Calyptridium pygmaeum is in c&s SNH)

4. Seed < 0.5 mm, papillae generally 0 or marginal;  1–3 mm, slender

5. Petals 4; stamens generally 3 ..... C. pygmaeum

5' Petals 2; stamen 1 ..... C. roseum

4' Seed >= 0.5 mm, papillae marginal or throughout (except 0 in Calyptridium arizonicum); pedicel < 2 mm, thickened (slender, 1–2 mm in Calyptridium quadripetalum)

6. Petals generally 3; stamen 1; fruit  to ; seeds 4–10, generally from base to above middle of fruit, often in ± 1 row ..... C. monandrum

6' Petals 4; stamens 1–3; fruit widely  or  to  or oblong; seeds 5–many, generally from base to middle of fruit, not in ± 1 row

7. Seed papillae coarse, generally throughout;  leaves generally persistent in fruit; flowers deciduous in fruit; sepals scarious throughout ..... C. quadripetalum

7' Seed papillae 0 or ± fine, throughout or marginal; basal leaves generally withering in fruit; flowers persistent in fruit to not; sepals generally scarious on margin or becoming scarious throughout

8. Seed 0.7–0.8 mm, papillae 0; fruit 6–7 mm; w DSon ..... C. arizonicum

8' Seed generally 0.5–0.7 mm, papillae throughout or marginal; fruit < 6 mm; sw SnFrB, n SCoR, s SCoRO, TR, SnJt, SNE, DMtns ..... C. parryi

9. Seed papillae throughout; s SCoRO, TR, SnJt ..... var. parryi

9' Seed papillae marginal; sw SnFrB, n SCoR, SNE, DMtns

10. Seed 0.5–0.6 mm; sepals ovate, with generally narrowly scarious margin; 600–1050 m, sw SnFrB, n SCoR ..... var. hesseae

10' Seed 0.6–0.7 mm; sepals ovate to , with widely scarious margin or scarious throughout; 1500–2990 m, SNE, DMtns ..... var. nevadense



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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