Jepson eFlora
Key to families | Table of families and genera

Key to Cerastium

View taxon page for Cerastium

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

1. Annual (or appearing so); stems generally all flowering, ascending to erect

2. Calyx 8.5–12 mm; fruit 14–22 mm; seeds 0.9–1.1 mm ..... C. dichotomum

2' Calyx 3–7 mm; fruit 3.5–11 mm; seeds ± 0.4–1 mm

3. Upper bracts scarious-margined; scarious margin of most outer sepals 0.2–0.6 mm wide ..... C. fontanum subsp. vulgare (2)

3' Upper bracts not scarious (rarely with minute scarious tip); scarious margin of most outer sepals < 0.1 mm wide

4. Flower parts 4(5); sepals with 0 hairs exceeding tip; bracts not scarious or rarely with minute scarious tip; pedicels in fruit generally > sepals ..... [C. diffusum]

4' Flower parts 5; sepals with some hairs exceeding tip by 0.2–0.8 mm; bracts not scarious; pedicels in fruit (except lowest) < sepals ..... C. glomeratum

1' Perennial herb; stems both non-flowering (mat-forming) and flowering (± erect)

5. Petals 1.5 mm < to 0.5 mm > sepals ..... C. fontanum subsp. vulgare (2)

5' Petals ± 1.2–6 mm > sepals

6. Leaves not clustered in flower stem axils; petals 1.2–2.8 mm > sepals; fruit 5.5–8.5 mm; seeds 0.7–0.8 mm; 2900–4300 m ..... C. beeringianum

6' Leaves clustered in flower stem axils, especially below; petals 3–6 mm > sepals; fruit (7.5) 9–16 mm; seeds ± 1–1.5 mm; < 2500 m

7. Stems 5–20(30) cm; petals 7.5–9 mm; sepals 4.2–6(7) mm ..... C. arvense subsp. strictum

7' Stems 15–45 cm; petals 10–15 mm; sepals 6–9 mm ..... C. viride


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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