Packera macounii

(Greene) W. A. Weber & Á. Löve

Phytologia 49: 47. 1981.

Common names: Siskiyou Mountain ragwort
Basionym: Senecio macounii GreeneSenecio fastigiatus Nuttall
Synonyms: Senecio fastigiatus subsp. macounii (Greene) GreenmanSenecio leucocrinus GreeneSenecio ligulifolius A. HellerSenecio spatuliformis unknown
Treatment appears in FNA Volume 20. Treatment on page 591. Mentioned on page 576.
Revision as of 00:32, 27 July 2019 by FNA>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Perennials, 30–40+ cm; taprooted (caudices ± branched, becoming rhizomiform). Stems 1, sparsely to densely tomentose or glabrescent. Basal leaves (and proximal) petiolate; blades lanceolate to oblanceolate, 30–50+ × 10–20 mm, bases tapering, margins entire or shallowly toothed (slightly revolute). Cauline leaves gradually reduced (distal sessile, bractlike). Heads 6–15+ in corymbiform arrays. Peduncles inconspicuously bracteate or ebracteate, sparsely tomentose to glabrate. Calyculi 0 or inconspicuous. Phyllaries 13 or 21, green, 5–7+ mm, glabrous. Ray florets 8(–13); corolla laminae 8–10+ mm. Disc florets 30–40+; corolla tubes 2.5–3.5 mm, limbs 2–3 mm. Cypselae 1.5–2 mm, glabrous; pappi 4–5 mm. 2n = 46, 92.


Phenology: Flowering early May–early Jul.
Habitat: Along streams, roadsides, clearings, disturbed sites, rocky soils, coniferous woodlands
Elevation: 400–1400 m

Distribution

V20-1319-distribution-map.gif

B.C., Calif., Oreg., Wash.

Discussion

Packera macounii is similar in overall morphology to P. cana. Leaves of P. macounii are narrower and frequently revolute. It is often cited as being collected on serpentine soils; it is not restricted to them. Senecio fastigiatus Nuttall (1840) is a later homonym of S. fastigiatus Schweinitz ex Elliott (1823), a name of uncertain application.

Selected References

None.

Lower Taxa

None.
... more about "Packera macounii"
Debra K. Trock +
(Greene) W. A. Weber & Á. Löve +
Senecio macounii +  and Senecio fastigiatus +
Siskiyou Mountain ragwort +
B.C. +, Calif. +, Oreg. +  and Wash. +
400–1400 m +
Along streams, roadsides, clearings, disturbed sites, rocky soils, coniferous woodlands +
Flowering early May–early Jul. +
Senecio fastigiatus subsp. macounii +, Senecio leucocrinus +, Senecio ligulifolius +  and Senecio spatuliformis +
Packera macounii +
species +