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serpentine groundsel, Siskiyou butterweed, western ragwort

burnet ragwort

Habit Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). Perennials or biennials, 30–50+ cm; ± fibrous-rooted (bases creeping, ascending to erect).
Stems

1, glabrous or sparsely tomentose.

1 or 2–3, clustered, glabrous or leaf axils 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.

(and proximal cauline) petiolate;

blades broadly oblanceolate (pinnately lobed, lateral lobes 2–3+ pairs, their bases petioluliform, terminal lobes larger than laterals, ovate to reniform, midribs not winged), 60–120+ × 20–60 mm, bases contracted, ultimate margins crenate to crenate-dentate.

Cauline leaves

abruptly reduced (sessile, clasping; bractlike, entire).

gradually reduced (petiolate or sessile; lyrate to sublyrate, midribs winged, terminal lobes weakly distinct, shallowly dentate).

Peduncles

bracteate (bractlets red-tinged), densely lanate-tomentose.

inconspicuously bracteate, glabrous or tomentose proximally.

Ray florets

(8–)13;

corolla laminae 6–10+ mm.

8;

corolla laminae 6–12 mm.

Disc florets

35–50+;

corolla tubes 2.5–3.5 mm, limbs 3–4 mm.

35–50+;

corolla tubes 2.5–3.5 mm, limbs 2–3 mm.

Phyllaries

(13–)21, green (tips red or dark red), densely tomentose proximally.

13, bright green (tips light green to yellow), 4–7 mm, glabrous.

Calyculi

conspicuous (bractlets narrow, red-tinged).

inconspicuous.

Heads

1–4+ in corymbiform arrays.

3–8+ in subumbelliform or compound, cymiform arrays (of 2–4+ cymiform clusters of 2–5+ heads each).

Cypselae

1.5–2 mm, glabrous;

pappi 5–6 mm.

1.5–2 mm, glabrous;

pappi 4.5–5.5 mm.

2n

= 46.

= 46.

Packera hesperia

Packera sanguisorboides

Phenology Flowering mid Apr–mid Jun. Flowering late Jul–mid Sep.
Habitat Serpentine derived soils, open woodland scrub Damp, open meadows, spruce-aspen forests
Elevation 500–2500 m (1600–8200 ft) 2700–3700 m (8900–12100 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
NM
[WildflowerSearch map]
[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.)

Packera sanguisorboides is known from the San Juan and Sangre de Cristo mountains of northern New Mexico, the Magdalena Mountains of western New Mexico, and the Sacramento Mountains of southern Lincoln and Otero counties. It may have affinities with P. coahuilensis Greenman.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 589. FNA vol. 20, p. 598.
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. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
Synonyms Senecio hesperius, Senecio auleticus Senecio sanguisorboides
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981)
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