Jepson eFlora
Key to families | Table of families and genera

Key to Calyptridium

View taxon page for Calyptridium

1. Perennial herb; style thread-like, 2–4 mm, exserted

2. Inflorescence >= 2 per rosette; 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 included

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

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

4. Seed < 0.5 mm, papillae generally 0 or marginal; pedicel 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 oblong to linear; 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 ovate or lanceolate to elliptic or oblong; seeds 5–many, generally from base to middle of fruit, not in ± 1 row

7. Seed papillae coarse, generally throughout; basal 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 Sonoran Desert ..... C. arizonicum

8' Seed generally 0.5–0.7 mm, papillae throughout or marginal; fruit < 6 mm; sw San Francisco Bay Area, n South Coast Ranges, s Outer South Coast Ranges, Transverse Ranges, San Jacinto Mountains, East of Sierra Nevada, Desert Mountains ..... C. parryi

9. Seed papillae throughout; s Outer South Coast Ranges, Transverse Ranges, San Jacinto Mountains ..... var. parryi

9' Seed papillae marginal; sw San Francisco Bay Area, n South Coast Ranges, East of Sierra Nevada, Desert Mountains

10. Seed 0.5–0.6 mm; sepals ovate, with generally narrowly scarious margin; 600–1050 m, sw San Francisco Bay Area, n South Coast Ranges ..... var. hesseae

10' Seed 0.6–0.7 mm; sepals ovate to reniform, with widely scarious margin or scarious throughout; 1500–2990 m, East of Sierra Nevada, Desert Mountains ..... var. nevadense

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