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lobeleaf groundsel

serpentine groundsel, Siskiyou butterweed, western ragwort

Habit Biennials or perennials, 20–40+ cm; taprooted (caudices ascending to erect, weakly branched). Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender).
Stems

1 or 2–5, loosely clustered, usually glabrous or glabrescent, sometimes sparsely tomentose throughout, axils (basal leaves) tomentose.

1, glabrous or sparsely tomentose.

Basal leaves

(and proximal cauline) petiolate;

blades obovate, oblanceolate, spatulate, or lyrate to sublyrate (± pinnately lobed, lateral lobes 3–6 pairs, smaller than terminal lobes), 40–80+ × 10–30+ mm, bases tapering, ultimate margins incised to dentate.

(and proximal cauline) petiolate;

blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate.

Cauline leaves

gradually reduced (sessile).

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

Peduncles

conspicuously bracteate, glabrous or tomentose.

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

Ray florets

8–13;

corolla laminae 7–10 mm.

(8–)13;

corolla laminae 6–10+ mm.

Disc florets

40–50+;

corolla tubes 4–5 mm, limbs 3–4 mm.

35–50+;

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

Phyllaries

13–21, green (tips often yellow), 4–9+ mm, glabrous or sparsely tomentose (at least proximally).

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

Calyculi

conspicuous.

conspicuous (bractlets narrow, red-tinged).

Heads

10–30+ in open, corymbiform or subumbelliform arrays.

1–4+ in corymbiform arrays.

Cypselae

2–3 mm, glabrous or hirtellous on ribs;

pappi 5–6 mm.

1.5–2 mm, glabrous;

pappi 5–6 mm.

2n

= 46, 92.

= 46.

Packera multilobata

Packera hesperia

Phenology Flowering early May–mid Jul. Flowering mid Apr–mid Jun.
Habitat Dry rocky or sandy soils in sagebrush, woodlands, and subalpine areas Serpentine derived soils, open woodland scrub
Elevation 1200–2900 m (3900–9500 ft) 500–2500 m (1600–8200 ft)
Distribution
from FNA
AZ; CA; CO; ID; NM; NV; UT; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Packera multilobata is abundant and widespread west of the Continental Divide. Both morphology and habitat vary. In colder parts of its range, plants are shorter, caudices are better developed with clustered stems, and leaf lobes are larger. In desert-like habitats, basal leaves are narrower and more finely lobed, the tomentum is often persistent, and stems are usually single.

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

Of conservation concern.

Packera hesperia is known only from the Siskiyou Mountains.

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

Source FNA vol. 20, p. 592. 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. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, 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. 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 multilobatus, Senecio leucoreus, Senecio lynceus, Senecio nelsonii var. uintahensis, Senecio prolixus, Senecio stygius, Senecio thornberi, Senecio uintahensis Senecio hesperius, Senecio auleticus
Name authority (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981)
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