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Packera cynthioides

Packera cynthioides (Greene) W.A. Weber & A. Löve  
Family: Asteraceae
White Mountain Groundsel, more...White Mountain ragwort
[Senecio cynthiodes Greene, moreSenecio cynthioides Greene, Senecio fendleri var. subintegra Greene, Senecio wrightii Greenm.]
Packera cynthioides image
Cecelia Alexander
  • FNA
  • Resources
Debra K. Trock in Flora of North America (vol. 20)
Perennials, 20-40+ cm; rhizomatous (rhizomes horizontal to erect). Stems 1 or 2-3, clustered, densely lanate-tomentose or canescent, tufts of arachnoid tomentum in leaf axils, or glabrescent. Basal leaves (thick, leathery) petiolate; blades narrowly lanceolate or oblanceolate, 25-100+ × 5-20 mm, bases tapering, margins entire, subentire, dentate, or wavy (adaxial faces early glabrescent). Cauline leaves gradually reduced (sessile; lanceolate to oblanceolate, entire or wavy). Heads 10-30+ in open or congested, cymiform arrays. Peduncles 0 (or relatively reduced, then densely tomentose). Calyculi inconspicuous (bractlets red-tipped). Phyllaries (8-)13, green (tips red), 3-6 mm, densely tomentose proximally, glabrate distally. Ray florets (5-)8; corolla laminae 8-10+ mm. Disc florets 35-45+; corolla tubes 2.5-3.5 mm, limbs 3.5-4.5 mm. Cypselae 1-1.5 mm, glabrous; pappi 5-6 mm. 2n = 46.

Flowering late Jul-mid Sep. Loose rocky soils, steep slopes, subalpine and pine-juniper forests; 2200-2900 m; N.Mex.

Packera cynthioides blooms later than other Packera species at the same latitudes. It is noted by collectors as usually growing on north- or west-facing slopes in limestone-derived soils. Its cauline leaves are well developed and held at a shallow angle to the stem, giving the plant a more 'leafy' aspect than other members of the genus.

Packera cynthioides
Open Interactive Map
Packera cynthioides image
Cecelia Alexander
Packera cynthioides image
Cecelia Alexander
Packera cynthioides image
Cecelia Alexander
Packera cynthioides image
Cecelia Alexander
Packera cynthioides image
Cecelia Alexander
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Frank Reichenbacher
Packera cynthioides image
Frank Reichenbacher
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