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cleft-leaf groundsel, Rocky Mountain butterweed, Rocky Mountain groundsel

Habit Perennials, 10–50+ cm; fibrous-rooted (caudices weak to stout, horizontal to suberect).
Stems

1 or 2–5, clustered, usually glabrous, sometimes sparsely floccose-tomentose proximally and in leaf axils.

Basal leaves

(and proximal cauline, relatively thick and turgid) petiolate;

blades spatulate to oblanceolate, or ovate to orbiculate, 20–40+ × 10–30+ mm, bases tapering to abruptly contracted or subcordate, margins entire, crenate, dentate, or weakly lobulate (faces usually glabrous, sometimes hairy).

Cauline leaves

gradually to abruptly reduced (± petiolate or sessile; entire or subentire).

Peduncles

bracteate, glabrous or sparsely tomentose.

Ray florets

8 or 13;

corolla laminae 5–10 mm.

Disc florets

35–60+;

corolla tubes 2–4 mm, limbs 2.5–4 mm.

Phyllaries

(8–)13 or 21, green (tips sometimes cyanic), 4–7+ mm, glabrous.

Calyculi

conspicuous.

Heads

2–20+ in loose, corymbiform or subumbelliform arrays.

Cypselae

1–2.5 mm, glabrous;

pappi 3–6 mm.

2n

= 46, 92.

Packera streptanthifolia

Phenology Flowering late May–late Aug.
Habitat Forests, open meadows, valleys, dry to damp and loamy soils
Elevation 1000–3400 m (3300–11200 ft)
Distribution
from FNA
CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; NT; SK; YT
[WildflowerSearch map]
[BONAP county map]
Discussion

Packera streptanthifolia is widespread and variable throughout the Western Cordillera. It includes weakly defined phases that have been treated as distinct species or as varieties. Characteristics used to delimit those taxa often overlap and are difficult to score; some “phases” grade into each other. Northern populations are sometimes segregated as a distinct taxon (e.g., Senecio streptanthifolia var. borealis; J. F. Bain 1988).

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

Source FNA vol. 20, p. 599.
Parent taxa 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. 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. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
Synonyms Senecio streptanthifolius, P. streptanthifolia var. borealis, Senecio adamsii, Senecio aureus var. borealis, Senecio cognatus, Senecio cymbalarioides, Senecio cymbalarioides var. borealis, Senecio cymbalarioides var. streptanthifolius, Senecio fulgens, Senecio jonesii, Senecio leonardii, Senecio longipetiolatus, Senecio oödes, Senecio platylobus, Senecio rydbergii, Senecio streptanthifolius var. borealis, Senecio streptanthifolius var. kluanei, Senecio streptanthifolius var. laetiflorus, Senecio streptanthifolius var. oödes, Senecio streptanthifolius var. rubricaulis, Senecio streptanthifolius var. wallowensis, Senecio subcuneatus, Senecio suksdorfii, Senecio wardii
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981)
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