Helenium puberulum

de Candolle in A. P. de Candolle and A. L. P. P. de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 667. 1836

Common names: Rosilla
Treatment appears in FNA Volume 21. Treatment on page 432. Mentioned on page 427, 428.

Annuals or perennials, 50–160 cm. Stems usually 1, branched distally, strongly winged, glabrous proximally, sparsely hairy distally. Leaves glabrous or sparsely hairy; basal blades oblanceolate to oblong-elliptic, entire; proximal and mid blades lanceolate to oblong-elliptic, entire; distal blades lance-linear, entire. Heads 4–20(–30) per plant, in paniculiform arrays. Peduncles (6–)9–17(–23) cm, sparsely to moderately hairy. Involucres globose to depressed globose, 9–15 × 9–17(–19) mm. Phyllaries (distinct or connate proximally) moderately hairy. Ray florets 0, or 13–15, pistillate, fertile; corollas yellow, 3.8–10 × 2–4 mm. Disc florets 300–500(–1000+); corollas yellow proximally, yellow to reddish brown to purple distally, (1.6–)1.9–2.7 mm, lobes 4(–5). Cypselae 1.2–1.9 mm, moderately hairy; pappi of 5–6 entire, aristate scales 0.4–1 mm. 2n = 58.


Phenology: Flowering (Mar–)Jun–Aug(–Nov).
Habitat: Along streams, ditches, seepage areas, around ponds and lakes, forests, woodlands
Elevation: 0–1200 m

Distribution

V21-1078-distribution-map.gif

Calif., Mexico (Baja California).

Discussion

Helenium puberulum may be of amphidiploid origin from hybridization between H. bigelovii (perennial, radiate, 2n = 32) and H. thurberi (annual, rayless, 2n = 26) (M. W. Bierner 1972).

Selected References

None.

Lower Taxa

None.

... more about "Helenium puberulum"
Mark W. Bierner +
de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
Rosilla +
Calif. +  and Mexico (Baja California). +
0–1200 m +
Along streams, ditches, seepage areas, around ponds and lakes, forests, woodlands +
Flowering (Mar–)Jun–Aug(–Nov). +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Compositae +
Helenium puberulum +
Helenium +
species +