Jepson eFlora
Key to families | Table of families and genera

Key to Callitriche

View taxon page for Callitriche

1. Leaf dark green, contrasting strongly with pale stem; leaves all ± linear or tapering from near base; no leaves with > 1 central vein ..... C. fassettii

1' Leaf pale green and not contrasting strongly with stem; leaves ± linear and vein 1, to broad, petioled, and veins > 1

2. Fruit wing 0 or winged only distal to middle

3. Fruit length >= width, wing distal to middle only or 0; fruit with evident lines of cells on faces ..... C. palustris

3' Fruit length ± = width, generally wing 0; cells on fruit faces obscure ..... C. heterophylla

4. Fruit 0.8–1.4 mm ..... var. bolanderi

4' Fruit 0.6–0.8 mm ..... var. heterophylla

2' Fruit winged from tip to base

5. Peduncle in fruit 2–25 mm

6. Fruit length >= width, 1–1.2 mm, 0.9–1.2 mm wide ..... C. longipedunculata

6' Fruit length < width, 0.7–1 mm, 1.1–1.4 mm wide ..... C. marginata (2)

5' Peduncle in fruit 0–1 mm

7. Mature fruit gray-brown, not contrasting strongly with wing ..... C. stagnalis

7' Mature fruit dark brown to black, contrasting strongly with translucent wing

8. Fruit length < width, 0.7–1 mm, 1.1–1.4 mm wide ..... C. marginata (2)

8' Fruit length = width, 1–1.5 mm, 1–1.5 mm wide ..... C. trochlearis

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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].
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