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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
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; BC; NT; YT
[BONAP county map]
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
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
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)
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