Northern Prairie Wildlife Research Center
Southern Wetland Flora
Field Office Guide to Plant Species
Helianthus angustifolius L.
- Family: Aster (Asteraceae)
- Flowering: August-October
- Field Marks: This sunflower is readily distinguished by its very narrow, rough, hairy leaves
by its purplish disk in the center of the flower head.
- Habitat: Sandy woods, wet prairies, thickets, low pinelands, flatwoods, moist road shoulders,
bogs, swales, ditches; sometimes upland woods and old fields.
- Habit: Perennial herb with a short crown and slender rhizomes.
- Stems: Upright, branched or unbranched, often hairy, up to 7 feet tall.
- Leaves: Alternate above, opposite below, simple, linear, pointed at the tip, tapering to the
sessile base, without teeth, hairy, up to 7 inches long, up to 1/2 inch wide.
- Flowers: Many crowded into a head, with several heads on each plant; each head up to
2 1/2 inches across, with 10-20 yellow rays surrounding a purplish center, subtended by narrow,
pointed, hairy bracts.
- Sepals: 0.
- Petals: 5, united, some of them ray-like and yellow, others united to form a short tube and
- Stamens: 5.
- Pistils: Ovary inferior.
- Fruits: Achenes flat, brown, usually smooth, up to 1/4 inch long, with two short projections
at the tip.
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