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serpentine groundsel, Siskiyou butterweed, western ragwort

dwarf arctic groundsel, dwarf arctic ragwort, northern butterweed

Habit Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). Perennials, 6–25+ cm; rhizomatous (mat forming, rhizomes horizontal to suberect, branched).
Stems

1, glabrous or sparsely tomentose.

usually 1 (sometimes more, clustered), usually glabrous, sometimes bases and 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.

petiolate;

blades ovate to obovate, lyrate, or reniform, 10–30+ × 10–25+ mm, bases cuneate (sometimes tapering to winged petioles) to subcordate or contracted, margins crenate, dentate, or weakly lobed.

Cauline leaves

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

abruptly reduced (sessile, not clasping; lanceolate, entire or pinnately lobed to pinnatisect).

Peduncles

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

0 or relatively reduced (then densely tomentose).

Ray florets

(8–)13;

corolla laminae 6–10+ mm.

0 or 11–13;

corolla laminae (yellow, purple streaks in veins) 10–14+ mm.

Disc florets

35–50+;

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

60–75+;

corolla tubes 2–2.5 mm, limbs 4–5 mm.

Phyllaries

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

21, deep red or green (tips red), 6–8 mm, glabrous.

Calyculi

conspicuous (bractlets narrow, red-tinged).

conspicuous (bractlets cyanic).

Heads

1–4+ in corymbiform arrays.

1–2.

Cypselae

1.5–2 mm, glabrous;

pappi 5–6 mm.

1.5–2 mm, glabrous;

pappi 5–6 mm.

2n

= 46.

= 46, 92, 138.

Packera hesperia

Packera cymbalaria

Phenology Flowering mid Apr–mid Jun. Flowering mid Jun–early Aug.
Habitat Serpentine derived soils, open woodland scrub Exposed rocky slopes, tundra turf
Elevation 500–2500 m (1600–8200 ft) 0–1900 m (0–6200 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; AB; BC; NF; NT; QC; YT
[WildflowerSearch 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 cymbalaria occurs in three, disjunct regions: western Alaska eastward into western N.W.T. and south into northwestern British Columbia; Newfoundland and the Gaspé Peninsula, Quebec; and Siberia. Considerable morphologic overlap exists between western and eastern populations in North America; western populations have slightly different flavonoid chemistries and chromosome numbers. Western populations are either diploid or tetraploid; eastern populations are hexaploid. The correct name for this species may prove to be Packera heterophylla (Fischer) E. Wiebe, based on Cineraria heterophylla Fischer.

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

Source FNA vol. 20, p. 589. FNA vol. 20, p. 583.
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. 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. 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 cymbalaria, Cineraria lyrata, P. resedifolia, S. fernaldii, S. resedifolius
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) (Pursh) W. A. Weber & Á. Löve: Bot. Not. 128: 497. (1976)
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