Helenium pinnatifidum

(Schweinitz ex Nuttall) Rydberg

in N. L. Britton et al., N. Amer. Fl. 34: 130. 1915.

Common names: Southeastern sneezeweed
Endemic
Basionym: Leptopoda pinnatifida Schweinitz ex Nuttall Trans. Amer. Philos. Soc., n. s. 7: 372. 1841
Treatment appears in FNA Volume 21. Treatment on page 429. Mentioned on page 427.

Perennials, 30–80 cm. Stems usually 1, usually unbranched distally, weakly winged, glabrous or sparsely to moderately hairy proximally, sparsely to moderately hairy distally. Leaves usually glabrous, rarely sparsely hairy; basal blades obovate to oblanceolate, usually pinnatifid, sometimes undulate to undulate-serrate, rarely entire; proximal and mid blades linear-oblanceolate to lance-linear, entire or undulate-serrate; distal blades lance-linear, entire. Heads 1(–3) per plant, usually borne singly. Peduncles 3–20 cm, moderately to densely hairy. Involucres hemispheric, 12–20 × 15–30 mm. Phyllaries moderately hairy. Ray florets 13–34, neuter; corollas yellow, 15–22 × 5–8 mm. Disc florets 250–650(–800+); corollas yellow proximally, yellow to yellow-brown distally, 4–5.5 mm, lobes 5. Cypselae 1.2–1.4 mm, moderately hairy; pappi of 8–11 entire or slightly lacerate, non-aristate scales 1.2–1.5 mm. 2n = 32, 34.


Phenology: Flowering (Feb–)Mar–Apr(–May).
Habitat: Ditches, other moist areas such as wet woods, bogs, and swamp edges
Elevation: 10–50 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Helenium pinnatifidum"
Mark W. Bierner +
(Schweinitz ex Nuttall) Rydberg +
Leptopoda pinnatifida +
Southeastern sneezeweed +
Fla. +, Ga. +, N.C. +  and S.C. +
10–50 m +
Ditches, other moist areas such as wet woods, bogs, and swamp edges +
Flowering (Feb–)Mar–Apr(–May). +
in N. L. Britton et al., N. Amer. Fl. +
Compositae +
Helenium pinnatifidum +
Helenium +
species +