Packera hesperia |
Packera ogotorukensis |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
Ogotoruk Creek butterweed, Ogotoruk Creek ragwort |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 8–15+ cm; fibrous-rooted or ± rhizomatous (bases horizontal to ascending). |
Stems | 1, glabrous or sparsely tomentose. |
1 (often branched proximally, sometimes distally), sparsely to densely floccose-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. |
petiolate; blades elliptic to oblanceolate or ovate, 20–80+ × 20–60+ mm, bases tapering, margins entire, crenate-serrate, or irregularly to pinnately lobed (abaxial faces white-tomentose, adaxials patchy tomentose to glabrate). |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
gradually to abruptly reduced (sessile; mids lanceolate to oblanceolate, irregularly serrate to pinnately lobed, distals bractlike). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
bracteate, ± tomentose. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
10–13+; corolla laminae 8–12+ mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
60–70+; corolla tubes 1–1.5 mm, limbs 2–2.5 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
13 or 21, green (sometimes with purple streaks, tips usually purple), 4–8 mm, proximally tomentose, rarely glabrous. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
conspicuous (bractlets purple-tinged). |
Heads | 1–4+ in corymbiform arrays. |
1(–3). |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
1–1.5 mm, glabrous; pappi 2.5–3 mm. |
2n | = 46. |
= 92. |
Packera hesperia |
Packera ogotorukensis |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering mid Jun–mid Jul (maritime), early Jul–early Aug (continental). |
Habitat | Serpentine derived soils, open woodland scrub | Open rocky/gravelly areas, tundra, talus slopes, stream banks, roadsides |
Elevation | 500–2500 m (1600–8200 ft) | 0–1800 m (0–5900 ft) |
Distribution |
CA; OR
|
AK; BC; NT; YT |
Discussion | Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Plants of Packera ogotorukensis have been treated as a disjunct of P. conterminus (as Senecio conterminus). Gross morphology, cytological data, and pollen morphology all provide good evidence for recognition of P. ogotorukensis as a distinct species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 594. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio ogotorukensis |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Packer) Á. Löve & D. Löve: Bot. Not. 128: 520. (1976) |
Web links |