Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Trollius laxus Salisb.
- Family: Butter-cup (Ranunculaceae)
- Flowering: June-August
- Field Marks: This species is readily recognized by its large solitary flower with large sepals and smaller petals and by its deeply palmately lobed leaves.
- Habitat: Swamps, wet woods, along streams, wet meadows, particularly in the mountains.
- Habit: Perennial herb with thick, fibrous roots.
- Stems: Upright, slender, up to 1 1/2 feet tall, smooth.
- Leaves: Alternate, palmately 5-lobed, up to 8 inches long and broad, the lobes coarsely toothed or partly divided again, smooth, the basal leaves on long stalks, the 1 or 2 cauline leaves on short stalks or sessile.
- Flowers: Solitary, up to 2 1/2 inches across, showy, usually whitish or greenish yellow.
- Sepals: Usually 5, free from each other, petal-like, white or greenish yellow, up to 1 inch long.
- Petals: Usually 5, free from each other, up to 1/4 inch long, each with a basal gland.
- Stamens: Numerous, usually longer than the petals.
- Pistils: Numerous, each with a superior ovary.
- Fruits: Follicles several, up to 1/2 inch long, containing many seeds.
- Notes: This handsome species varies considerably in flower color. It sometimes is grown as an ornamental.
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