Packera hesperia

(Greene) W. A. Weber & Á. Löve

Phytologia 49: 47. 1981.

Common names: Western ragwort
EndemicConservation concern
Basionym: Senecio hesperius Greene Pittonia 2: 166. 1891
Synonyms: Senecio auleticus Greene
Treatment appears in FNA Volume 20. Treatment on page 589. Mentioned on page 571, 576.

Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). Stems 1, glabrous or sparsely tomentose. Basal leaves (and proximal cauline) petiolate; blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate. Cauline leaves abruptly reduced (sessile, clasping; bractlike, entire). Heads 1–4+ in corymbiform arrays. Peduncles bracteate (bractlets red-tinged), densely lanate-tomentose. Calyculi conspicuous (bractlets narrow, red-tinged). Phyllaries (13–) 21, green (tips red or dark red), densely tomentose proximally. Ray-florets (8–) 13; corolla laminae 6–10+ mm. Disc-florets 35–50+; corolla-tubes 2.5–3.5 mm, limbs 3–4 mm. Cypselae 1.5–2 mm, glabrous; pappi 5–6 mm. 2n = 46.


Phenology: Flowering mid Apr–mid Jun.
Habitat: Serpentine derived soils, open woodland scrub
Elevation: 500–2500 m

Discussion

Of conservation concern.

Packera hesperia is known only from the Siskiyou Mountains.

Selected References

None.

Lower Taxa

None.
... more about "Packera hesperia"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
indeterminate +  and determinate +
Debra K. Trock +
(Greene) W. A. Weber & Á. Löve +
obtuse +  and tapering +
Senecio hesperius +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
spatulate;oblanceolate;spatulate;oblanceolate;ovate +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
winged;nerved;ribbed +
Western ragwort +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
pale-yellow +  and deep orange-red +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +  and Oreg. +
500–2500 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Serpentine derived soils, open woodland scrub +
discoid +  and radiate +
in compact or congested to open corymbiform cymiform or subumbelliform , , , arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
campanulate;cylindric +
sessile +  and petiolate +
cauline +  and basal +
erect;recurved +
deltate +
dentate to pinnatifid +  and entire +
dentate +, subentire +  and entire +
2-carpellate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
lanate-tomentose +
Flowering mid Apr–mid Jun. +
linear +  and ensiform +
bearing subulate enations +, hairy +  and bristly +
conic;usually flat;convex +
exalbuminous +
Endemic +  and Conservation concern +
prostrate +  and ascending +
tomentose +  and glabrous +
appendaged +  and truncate +
papillate +
Senecio auleticus +
Packera hesperia +
species +
campanulate +
serrate +  and denticulate +
7 cm70 mm <br />0.07 m <br /> (15 cm150 mm <br />0.15 m <br />) +
vine +, tree +, shrub +  and subshrub +
23 +, 22 +  and 20 +