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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
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
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
H. annuus, H. bolanderi, H. cusickii, H. nuttallii, H. petiolaris, H. tuberosus
H. annuus, H. cusickii, H. nuttallii, H. petiolaris, H. tuberosus
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