Northern Prairie Wildlife Research Center
Butterweed (Senecio glabellus)
- Family: Aster (Asteraceae)
- Flowering: April-June.
- Field Marks: This Senecio has all of its leaves pinnately divided into 3-13 segments.
- Habitat: Low woods, swamps, fallow fields.
- Habit: Annual herb with fibrous roots.
- Stems: Erect, usually smooth, sometimes branched, hollow, up to 3 feet tall.
- Leaves: Alternate, deeply pinnately divided into 3-13 segments, each segment usually toothed, smooth; the lower leaves on long stalks; the upper leaves on short stalks, or stalkless.
- Flowers: Many crowded into a head, with many heads per plant; each head up to 1 inch across, subtended by small, green bracts; the outer flowers yellow and ray-like; the inner flowers yellow and tubular, forming a disk.
- Sepals: 0.
- Petals: Some ray-like, yellow; others tubular, yellow, 5-lobed.
- Stamens: 5.
- Pistils: Ovary inferior.
- Fruits: Achenes smooth, with a tuft of white hairs at the top.
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