Packera streptanthifolia

(Greene) W. A. Weber & Á. Löve

Phytologia 49: 48. 1981.

Common names: Rocky Mountain groundsel
Endemic
Basionym: Senecio streptanthifolius Greene Erythea 3: 23. 1895
Synonyms: Packera streptanthifolia var. borealis (Torrey & A. Gray) Trock Senecio adamsii Howell Senecio aureus var. borealis Torrey & A. Gray Senecio cognatus Greene Senecio cymbalarioides Nuttall Senecio cymbalarioides var. borealis (Torrey & A. Gray) Greenman Senecio cymbalarioides var. streptanthifolius (Greene) Greenman Senecio fulgens Rydberg Senecio jonesii Rydberg Senecio leonardii Rydberg Senecio longipetiolatus Rydberg Senecio oödes Rydberg Senecio platylobus Rydberg Senecio rydbergii A. Nelson Senecio streptanthifolius var. borealis (Torrey & A. Gray) J. F. Bain Senecio streptanthifolius var. kluanei J. F. Bain Senecio streptanthifolius var. laetiflorus (Greene) J. F. Bain Senecio streptanthifolius var. oödes (Rydberg) J. F. Bain Senecio streptanthifolius var. rubricaulis (Greene) J. F. Bain Senecio streptanthifolius var. wallowensis J. F. Bain Senecio subcuneatus Senecio suksdorfii Senecio wardii
Treatment appears in FNA Volume 20. Treatment on page 599. Mentioned on page 570, 572, 573, 577, 593.

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). Heads 2–20+ in loose, corymbiform or subumbelliform arrays. Peduncles bracteate, glabrous or sparsely tomentose. Calyculi conspicuous. Phyllaries (8–) 13 or 21, green (tips sometimes cyanic), 4–7+ mm, glabrous. Ray-florets 8 or 13; corolla laminae 5–10 mm. Disc-florets 35–60+; corolla-tubes 2–4 mm, limbs 2.5–4 mm. Cypselae 1–2.5 mm, glabrous; pappi 3–6 mm. 2n = 46, 92.


Phenology: Flowering late May–late Aug.
Habitat: Forests, open meadows, valleys, dry to damp and loamy soils
Elevation: 1000–3400 m

Distribution

V20-1343-distribution-map.gif

Alta., B.C., N.W.T., Sask., Yukon, Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.

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).

Lower Taxa

None.
... more about "Packera streptanthifolia"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
subumbelliform +, corymbiform +  and loose +
indeterminate +  and determinate +
Debra K. Trock +
(Greene) W. A. Weber & Á. Löve +
subcordate +  and tapering +
Senecio streptanthifolius +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
spatulate;oblanceolate or ovate +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
winged;nerved;ribbed +
Rocky Mountain groundsel +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
pale-yellow +  and deep orange-red +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, N.W.T. +, Sask. +, Yukon +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1000–3400 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Forests, open meadows, valleys, dry to damp and loamy soils +
discoid +  and radiate +
in compact or congested to open corymbiform cymiform or subumbelliform , , , arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
campanulate;cylindric +
sessile +  and petiolate +
cauline +  and basal +
erect;recurved +
deltate +
dentate to pinnatifid +  and entire +
lobulate +, dentate +, crenate +  and entire +
2-carpellate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
tomentose +  and glabrous +
Flowering late May–late Aug. +
linear +  and ensiform +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
bearing subulate enations +, hairy +  and bristly +
conic;usually flat;convex +
bain1985a +  and bain1988a +
exalbuminous +
prostrate +  and ascending +
floccose-tomentose +  and glabrous +
2 +  and 5 +
appendaged +  and truncate +
papillate +
Packera 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 +  and Senecio wardii +
Packera streptanthifolia +
species +
campanulate +
serrate +  and denticulate +
10 cm100 mm <br />0.1 m <br /> (50 cm500 mm <br />0.5 m <br />) +
vine +, tree +, shrub +  and subshrub +
23 +, 22 +  and 20 +