Sunday, January 17, 2016

Ranunculus aquatilis (Water Buttercup, White Water Buttercup)

 7/8/16 Mill Creek, Lundy Canyon Trail, Inyo National Forest, Eastern Sierra, 
Mono County, CA

7/8/16 Mill Creek

8/16/04 Mill Creek, Lundy Canyon Trail 

8/16/04 Mill Creek


COMMON NAME: Water Buttercup, White Water Buttercup

SPECIES: Ranunculus aquatilis

FAMILY: Ranunculaceae (Buttercup Family)


LOCATION: Mill Creek off Lundy Canyon Trail, Inyo National Forest,  Eastern Sierra, Mono County, CA


Treatment from The Jepson Manual (1993):

Perennial (5)20–80 cm, aquatic, often mat-forming

Stem submersed or floating, branched throughout, rooting at lower nodes, glabrous

Leaves cauline, most or all submersed; submersed blades 10–40 mm, 3–6-dissected, cordate to reniform, segments thread-like, petioles < 1.5 cm; floating or emergent generally 0 or few, like submersed or not

Flower floating or emergent; receptacle hairy; sepals 2–5 mm; petals 4–10(14) mm, 1–2.5 mm wide, white, base yellow or not

Fruits 10–50; cluster spheric; body 1–2 mm, sides 1–1.5 mm, with transverse, broken, wavy ridges, glabrous to sparsely puberulent, back ± rounded; beak < 0.5 mm, ± straight

Ecology: Ponds, lake margins, marshes, rivers

Elevation: < 2900 m.  

Bioregional distribution: California Floristic Province (except Channel Islands), Great Basin Floristic Province 

Distribution outside California: to Alaska, e N.America, Mexico
Varieties intergrade, difficult to separate

Horticultural information: WET, SUN: 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.

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