Ranunculus aquatilis var. diffusus
Synonyms: Batrachium circinatum, Batrachium circinatum ssp. subrigidum, Batrachium longirostre, Ranunculus amphibius, Ranunculus aquatilis var. caespitosus, Ranunculus aquatilis var. capillaceus, Ranunculus aquatilis var. longirostris, Ranunculus aquatilis var. subrigidus, Ranunculus aquatilis var. trichophyllus, Ranunculus circinatus, Ranunculus circinatus var. subrigidus, Ranunculus longirostris, Ranunculus subrigidus, Ranunclus trichophyllus, Ranunculus trichophyllus var. trichophyllus, Ranunculus usneoides
White water buttercup is an aquatic, perennial wildflower with lax, submerged stems measuring from 10-100 cm long. The herbage is somewhat glabrous to pubescent and the lower nodes of the stem are known to root upon touching bottom. The leaves alternate along the stems, the submerge leaves dissected into many needle-like segments. The lower leaves are typically sessile while the upper leaves may have petioles measuring up to 2 cm long. The floating leaves are similar to the lower leaves but are 5-15 mm long and nearly twice as wide, the blades blades shallowly to deeply 3-lobed and with toothed or lobed segments.
The 5 greenish sepals measure from 2-5 mm long and are soon deciduous. The 5 white petals (sometimes yellowish toward their bases) measure from 5-10 mm long. The stamens number from 10-15.
White water buttercup is found in slow moving streams, ditches, or ponds and occasionally on mud.
White water buttercup may be found in moist habitats throughout much of North America and Europe.
In the Columbia River Gorge it may be found between the elevations of 100'-3600' between the Wind River and Horsethief Lake State Park.
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