Slideshow image
Packera cana (Hook.) W.A. Weber & A. Löve   (redirected from: Senecio purshianus Nutt.)
Go To Encyclopedia of Life...
Family: Asteraceae
Silver-Woolly Groundsel
[Senecio canus Hook.,  more, Senecio canus var. eradiatus D. C. Eaton ex S. Watson, Senecio convallium Greenm., Senecio hallii Britton, Senecio hallii var. discoidea W.A.Weber, Senecio harbourii Rydb., Senecio howellii Greene, Senecio laramiensis A.Nelson, Senecio purshianus Nutt.]
Packera cana image
  • FNA
  • Gleason & Cronquist
  • Web Links
Debra K. Trock in Flora of North America (vol. 20)
Perennials, 10-30+ cm; rhizomatous (rhizomes branched, suberect, stout). Stems 1 (per rosette, rosettes clustered), densely lanate or canescent. Basal leaves (and proximal cauline) petiolate; blades ovate or elliptic to lanceolate, 25-50+ × 10-30 mm, bases tapering, margins entire or irregularly undulate to weakly dentate (abaxial faces persistently lanate, adaxial lanate to subglabrescent). Cauline leaves gradually reduced (petiolate or sessile, then weakly clasping; elliptic to lanceolate, entire or weakly dentate). Heads 8-15+ in corymbiform arrays. Peduncles bracteate, usually densely lanate to floccose-tomentose (sometimes subglabrescent). Calyculi inconspicuous (bractlets tomentose). Phyllaries 13 or 21, green, 5-8+ mm, densely tomentose. Ray florets 8-10 (or 13); corolla laminae 8-10+ mm. Disc florets 35-50+; corolla tubes 2.5-3.5 mm, limbs 3.5-4.5 mm. Cypselae 2.5-3.5+ mm, glabrous; pappi 4.5-7 mm. 2n = 46, 92. Flowering late Jun (south)-mid Aug (north). Open plains and sagebrush associations, dry rocky slopes and crevices in granitic and limestone outcrops; 200-3700 m; Alta., B.C., Man., Sask.; Ariz., Calif., Colo., Idaho, Kans., Minn., Mont., Nebr., Nev., N.Mex., N.Dak., Oreg., S.Dak., Utah, Wash., Wyo. Packera cana is found in a wide variety of habitats and in a wide range of elevations throughout the western Cordillera and into the High Plains. Morphology is relatively uniform throughout its range except that alpine specimens are notably dwarfed and are often mistaken for P. werneriifolia, which differs by its consistently scapiform habit.

Vascular plants of NE US and adjacent Canada
Several-stemmed perennial 1-4 dm from a ±branched caudex, often with an evident short taproot; herbage ±strongly white-tomentose, often less so in age, the upper surfaces of the lvs sometimes glabrate; basal and lowermost cauline lvs ±tufted, from narrowly oblanceolate to broadly elliptic or subovate, the blade mostly 1-4 or 5 cm נ4-30(-45) mm, entire to irregularly subpinnately lobed, borne on a short or elongate petiole; middle and upper lvs few, strongly and progressively reduced, becoming bract-like; heads several; invol 4-8 mm; rays mostly 6-13 mm; achenes glabrous; 2n=46, 92, 138. Dry, open often rocky places; widespread in the w. cordillera, and e. to Minn. May-July.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
  • Encyclopedia of Life
  • W3Tropicos
  • USDA PLANTS Database
  • Flora of North America
  • International Plant Names Index
  • Google Search Engine
  • Google Images
  • BOLD Systems - Barcode of Life Data Systems
  • Global Biotic Interactions (GloBI)
  • NCBI - National Center for Biotechnology Information
Packera cana
Open Interactive Map
Packera cana image
Keir Morse  
Packera cana image
Keir Morse  
Packera cana image
Gary A. Monroe  
Packera cana image
Keir Morse  
Packera cana image
Barry Breckling  
Packera cana image
Gary A. Monroe  
Packera cana image
Keir Morse  
Packera cana image
Keir Morse  
Packera cana image
Gary A. Monroe  
Packera cana image
Barry Breckling  
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Packera cana image
Click to Display
100 Initial Images
- - - - -
View All Images