Jepson eFlora
Key to families | Table of families and genera

Key to Cerastium

View taxon page for Cerastium

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

Contact/Feedback

Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [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].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.