Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Ranunculus orthorhynchus Hook.
- Family: Butter-cup (Ranunculaceae)
- Flowering: May-July
- Field Marks: This butter-cup has achenes that are about 1/6 inch long with a straight beak about the same length. Most of the leaves are pinnately divided into 3-7 leaflets.
- Habitat: Wet meadows.
- Habit: Perennial herb with rather fleshy roots.
- Stems: Upright, usually branched, hollow, up to 1 1/2 feet tall, with spreading hairs.
- Leaves: At least the basal leaves pinnately divided into 3-7 leaflets, with each leaflet divided again into narrow, pointed segments, hairy; stalks up to 6 inches long, smooth or hairy.
- Flowers: Several in a branched cluster, up to 2 1/2 inches across.
- Sepals: 5, yellow-green, free from each other, up to 1/3 inch long, hairy, turned downward.
- Petals: 5, yellow, sometimes reddish on the back, free from each other, 1/3 inch to nearly 1 inch long.
- Stamens: 20-40.
- Pistils: Many in a cluster, each with a superior ovary, smooth.
- Fruits: Achenes 12-20 in a cluster, ellipsoid, up to 1/6 inch long, with a straight beak as long as the achenes or longer.
- Notes: The achenes are eaten by waterfowl.
Previous Species -- Small Yellow Water Butter-cup (Ranunculus gmelinii)
Return to Species List -- Group 6
Next Species -- Creeping Butter-cup (Ranunculus repens)