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serpentine groundsel, Siskiyou butterweed, western ragwort

northern groundsel

Habit Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). Perennials, 6–20+ cm; fibrous-rooted or rhizomatous (rhizomes horizontal to suberect, stout).
Stems

1, glabrous or sparsely tomentose.

usually 1, sometimes multiple, bases and leaf axils tomentose, otherwise glabrous.

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 oblanceolate to obovate or lyrate (pinnately lobed to pinnatifid, terminal lobes larger than laterals), 10–30+ × 10–20+ mm, bases tapering, ultimate margins ± crenate to serrate.

Cauline leaves

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

gradually to abruptly reduced (sessile; pinnatisect or entire).

Peduncles

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

bracteate (bractlets purple-tinged), glabrous or glabrate.

Ray florets

(8–)13;

corolla laminae 6–10+ mm.

0 (rarely) or 10–12;

corolla laminae 8–10 mm.

Disc florets

35–50+;

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

45–60+;

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

Phyllaries

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

13, green (sometimes purple-tinged distally), 6–8 mm, glabrous.

Calyculi

conspicuous (bractlets narrow, red-tinged).

0 or inconspicuous (bractlets purple-tinged).

Heads

1–4+ in corymbiform arrays.

1–2(–5+) in cymiform arrays.

Cypselae

1.5–2 mm, glabrous;

pappi 5–6 mm.

1.5–2.5 mm, hirtellous on ribs;

pappi 6–7 mm.

2n

= 46.

= 46.

Packera hesperia

Packera hyperborealis

Phenology Flowering mid Apr–mid Jun. Flowering mid Jun–early Aug.
Habitat Serpentine derived soils, open woodland scrub Open, dry, rocky or sandy areas, sometimes in fertile soils overlaying limestone
Elevation 500–2500 m (1600–8200 ft) 0–900 m (0–3000 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; NT; NU; 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.)

Packera hyperborealis is known only from lowland tundra from Alaska to the Mackenzie River and as far south as the northern end of the Franklin Mountains. It has also been collected as far north as Banks Island.

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

Source FNA vol. 20, p. 589. FNA vol. 20, p. 589.
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. 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 hyperborealis
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) (Greenman) Á. Löve & D. Löve: Bot. Not. 128: 520. (1976)
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