Helianthus laciniatus |
Helianthus bolanderi |
|
---|---|---|
Bolander's sunflower |
||
Habit | Plants annual, 6–15 dm. | |
Stems | erect, pustulose-hispid to setose or villous. |
|
Leaves | mostly alternate; ovate to lanceolate or linear-lanceolate, 3–15 cm, bases wedge-shaped or attenuate; margins entire or denticulate to serrulate; tips acute; surfaces hispid or strigose, petiolate, becoming sessile distally; petioles 1–4 cm. |
|
Involucres | hemispheric, 17–25 mm diameter. |
|
Ray florets | 12–17; rays 14–20 mm. |
|
Disc florets | 75+; corollas 5–7 mm; throats slightly widened distally; lobes usually reddish. |
|
Phyllaries | 10–18 in 2–3 series, lanceolate or lance-ovate, 9–25 × 3–5 mm; margins strigose-ciliate; tips acuminate; surfaces pustulose-hispid to strigose or silky-villous; outer nearly equal to inner or sometimes much enlarged and bract-like. |
|
Fruits | 3.5–4.5 mm, glabrate, pappi of 2 lanceolate scales, 1.5–3 mm. |
|
Heads | solitary to numerous. |
|
Paleae | glabrous; inner tips 3-toothed. |
|
2n | =34. |
|
Helianthus laciniatus |
Helianthus bolanderi |
|
Distribution | ||
Discussion | Open fields, roadsides. Flowering Jul–Oct. 300–1400 m. Sisk. CA. Native. |
|
Source | Flora of Oregon, volume 2, page 282 Kenton Chambers |
|
Sibling taxa | ||
Web links |