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serpentine groundsel, Siskiyou butterweed, western ragwort

Piedmont ragwort

Habit Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). Perennials, 25–60+ cm; fibrous-rooted (caudices branched).
Stems

1, glabrous or sparsely tomentose.

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

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 narrowly ovate to ovate (2–3 times pinnately dissected, ultimate lobes mostly linear to filiform), 50–80 × 30–50 mm, bases ± truncate or auriculate, ultimate margins entire or remotely dentate.

Cauline leaves

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

gradually reduced (petiolate or sessile, similar to basals).

Peduncles

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

bracteate or ebracteate, glabrous.

Ray florets

(8–)13;

corolla laminae 6–10+ mm.

8–10(–13);

corolla laminae 8–12 mm.

Disc florets

35–50+;

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

35–50+;

corolla tubes 2–3 mm, limbs 1.5–2.5 mm.

Phyllaries

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

(13–)21, green, 4–6 mm, glabrous (tips sometimes hair-tufted).

Calyculi

conspicuous (bractlets narrow, red-tinged).

0.

Heads

1–4+ in corymbiform arrays.

10–30+ in open, corymbiform arrays.

Cypselae

1.5–2 mm, glabrous;

pappi 5–6 mm.

0.75–1.5 mm, hairy on ribs;

pappi 3–4 mm.

2n

= 46.

Packera hesperia

Packera millefolium

Phenology Flowering mid Apr–mid Jun. Flowering early May–mid Jun.
Habitat Serpentine derived soils, open woodland scrub Open areas along streams, rock outcrops in thin, granitic-derived soils
Elevation 500–2500 m (1600–8200 ft) 400–900 m (1300–3000 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
GA; NC; SC; VA
[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 millefolia is known only from granitic soils in the southern Appalachians. It is similar in overall aspect to the widespread P. anonyma; it differs by its 2–3 times pinnately dissected leaves.

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

Source FNA vol. 20, p. 589. FNA vol. 20, p. 591.
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. 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 millefolium, Senecio memmingeri
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981)
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