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serpentine groundsel, Siskiyou butterweed, western ragwort

San Francisco Peaks ragwort

Habit Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). Perennials, 3–7+ cm; rhizomatous (rhizomes creeping, ascending).
Stems

1, glabrous or sparsely tomentose.

1 (often purplish), sparsely lanate or arachno-tomentose, glabrescent.

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 lyrate to sublyrate (midribs winged) or ovate to orbiculate, 10–20+ × 30–50+ mm, bases tapering to contracted, ultimate margins ± dentate (faces glabrate at flowering).

Cauline leaves

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

gradually reduced (sessile; usually bractlike and entire, sometimes larger and pinnatifid).

Peduncles

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

conspicuously bracteate (bractlets red-tipped), densely lanate-tomentose.

Ray florets

(8–)13;

corolla laminae 6–10+ mm.

8 or 13;

corolla laminae 5–10 mm.

Disc florets

35–50+;

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

30–40+;

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

Phyllaries

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

13 or 21, purplish, 6–9 mm, sparsely tomentose.

Calyculi

conspicuous (bractlets narrow, red-tinged).

conspicuous (bractlets reddish or purple).

Heads

1–4+ in corymbiform arrays.

borne singly or 2–6 in compact, cymiform arrays.

Cypselae

1.5–2 mm, glabrous;

pappi 5–6 mm.

1.5–2 mm, glabrous;

pappi 5–6 mm.

2n

= 46.

= 46.

Packera hesperia

Packera franciscana

Phenology Flowering mid Apr–mid Jun. Flowering mid Aug–mid Oct.
Habitat Serpentine derived soils, open woodland scrub Talus slopes, rock crevices, above timberline
Elevation 500–2500 m (1600–8200 ft) 3200–3800 m (10500–12500 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ
[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.)

Of conservation concern.

Packera franciscana is known only from above timberline in the San Francisco Peaks and is in the Center for Plant Conservation’s National Collection of Endangered Plants. It spreads by extensive rhizomes and is fairly abundant locally.

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

Source FNA vol. 20, p. 589. FNA vol. 20, p. 587.
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. 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. 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 franciscanus
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981)
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