Packera quercetorum |
Packera cana |
|
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Oak Creek ragwort |
woolly butterweed, woolly groundsel |
|
Habit | Perennials, 60–100+ cm; taprooted (caudices subligneous, ascending to erect). | Perennials, 10–30+ cm; rhizomatous (rhizomes branched, suberect, stout). |
Stems | 1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils. |
1 (per rosette, rosettes clustered), densely lanate or canescent. |
Basal leaves | (and proximal cauline) petiolate; blades obovate or lyrate (pinnately lobed, lateral lobes 2–6+ pairs, their bases petioluliform, terminal lobes larger than laterals, midribs narrowly winged), 60–160+ × 20–40+ mm, bases wide, ultimate margins sharply dentate, crenate-dentate, or irregularly incised. |
(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; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised). |
gradually reduced (petiolate or sessile, then weakly clasping; elliptic to lanceolate, entire or weakly dentate). |
Peduncles | ebracteate, glabrous. |
bracteate, usually densely lanate to floccose-tomentose (sometimes subglabrescent). |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
8–10 (or 13); corolla laminae 8–10+ mm. |
Disc florets | 60–70+; corolla tubes 2–3 mm, limbs 3.5–4.5 mm. |
35–50+; corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm. |
Phyllaries | (13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy). |
13 or 21, green, 5–8+ mm, densely tomentose. |
Calyculi | inconspicuous. |
inconspicuous (bractlets tomentose). |
Heads | 15–40+ in open, cymiform arrays. |
8–15+ in corymbiform arrays. |
Cypselae | 1.5–2 mm, glabrous or ± scabrellous; pappi 5.5–6.5 mm. |
2.5–3.5+ mm, glabrous; pappi 4.5–7 mm. |
2n | = 92. |
= 46, 92. |
Packera quercetorum |
Packera cana |
|
Phenology | Flowering mid Apr–early Jun. | Flowering late Jun (south)–mid Aug (north). |
Habitat | Rocky soils, open areas, scrub-oak and pinyon-pine forests, chaparral | Open plains and sagebrush associations, dry rocky slopes and crevices in granitic and limestone outcrops |
Elevation | 800–2200 m (2600–7200 ft) | 200–3700 m (700–12100 ft) |
Distribution |
AZ; NM
|
AZ; CA; CO; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
|
Discussion | Packera quercetorum is found only infrequently and in relatively small populations in central and southern Arizona and west-central New Mexico. The plants are robust and have probable affinities to P. multilobata. The plants have a bluish tinge when freshly collected and are distinctive in the field. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 598. | FNA vol. 20, p. 580. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio quercetorum, Senecio macropus | Senecio canus, Senecio canus var. eradiatus, Senecio canus var. purshianus, Senecio convallium, Senecio hallii, Senecio hallii var. discoidea, Senecio harbourii, Senecio howellii, Senecio laramiensis, Senecio oreopolus, Senecio purshianus |
Name authority | (Greene) C. Jeffrey: Kew Bull. 47: 101. (1992) | (Hooker) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) |
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