Helenium pinnatifidum

(Schweinitz ex Nuttall) Rydberg in N. L. Britton et al.

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 yellowbrown 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"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Mark W. Bierner +
(Schweinitz ex Nuttall) Rydberg in N. L. Britton et al. +
undulate +  and undulate-serrate +
decurrent +
Leptopoda pinnatifida +
compound +  and simple +
pinnatifid;lobed;spatulate;ovate;spatulate;ovate;oblong;oblanceolate;linear;lanceolate;elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Southeastern sneezeweed +
yellow +  and yellowbrown +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
4-5-angled +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Fla. +, Ga. +, N.C. +  and S.C. +
10–50 m +
gland-dotted +
glabrous or +  and sparsely densely hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Ditches, other moist areas such as wet woods, bogs, and swamp edges +
discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
hemispheric +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
sessile +  and petiolate +
hairy +  and glabrous +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
connate +  and distinct +
ovate +, oblong +, oblanceolate +, linear +, lanceolate +  and elliptic +
unequal +  and subequal +
2-carpellate +
persistent +
8 +  and 11 +
lacerate +  and entire +
3 cm30 mm <br />0.03 m <br /> (20 cm200 mm <br />0.2 m <br />) +
Flowering (Feb–)Mar–Apr(–May). +
9 +  and 34 +
in N. L. Britton et al., N. Amer. Fl. +
bearing subulate enations +, hairy +  and bristly +
ovoid;hemispheric;ovoid;hemispheric;globose;conic +
5 +  and 12 +
non-aristate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
exalbuminous +
winged +  and unbranched +
1 (?) +  and 10 (?) +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Helenium pinnatifidum +
Helenium +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
shrub +  and subshrub +