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 herb; style thread-like, 2–4 mm, 

exserted 

Protruding out of surrounding structure(s) (e.g., stamens exserted from corolla).

2. Inflorescence >= 2 per 

rosette 

A radiating cluster of leaves generally at or near ground level.

; 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 

Not protruding out of surrounding structure(s) (e.g., stamens included in corolla).

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; 

pedicel 

Stalk of an individual flower in an inflorescence, or the corresponding structure in fruit.

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 

Longer than wide, with nearly parallel sides; wider than linear.

to 

linear 

Elongate, with nearly parallel sides; narrower than elliptic or oblong.

; 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 

Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf.

or 

lanceolate 

Narrowly elongate, widest in the basal half, often tapered to an acute tip.

to 

elliptic 

In the shape of a flattened circle or ellipse; wider than linear

or oblong; seeds 5–many, generally from base to middle of fruit, not in ± 1 row

7. Seed papillae coarse, generally throughout; 

basal 

At or near the base of a plant or plant part. Especially said of leaves clustered near the ground or of a placenta confined to the base of an ovary.

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 

reniform 

Kidney-shaped; often pertaining to a leaf in which the blade base on both sides of the petiole is rounded and concave.

, with widely scarious margin or scarious throughout; 1500–2990 m, SNE, DMtns ..... var. nevadense

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