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Small's ragwort

woolly butterweed, woolly groundsel

Habit Perennials, 30–70+ cm; fibrous-rooted (caudices erect to ascending). Perennials, 10–30+ cm; rhizomatous (rhizomes branched, suberect, stout).
Stems

1 or 2–5, loosely clustered, bases densely tomentose, leaf axils usually tomentose.

1 (per rosette, rosettes clustered), densely lanate or canescent.

Basal leaves

petiolate;

blades narrowly elliptic to oblanceolate, 30–90+ × 10–20+ mm, bases tapering, margins serrate to crenate-serrate (apices rounded to acute, faces glabrous).

(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; elliptic to lanceolate, often pinnatifid).

gradually reduced (petiolate or sessile, then weakly clasping; elliptic to lanceolate, entire or weakly dentate).

Peduncles

bracteate, distally tomentose.

bracteate, usually densely lanate to floccose-tomentose (sometimes subglabrescent).

Ray florets

8 or 13;

corolla laminae 5–7+ mm.

8–10 (or 13);

corolla laminae 8–10+ mm.

Disc florets

45–60+;

corolla tubes 1.5–2 mm, limbs 1.5–2 mm.

35–50+;

corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm.

Phyllaries

13 or 21, light green, 3–5 mm, glabrous.

13 or 21, green, 5–8+ mm, densely tomentose.

Calyculi

inconspicuous.

inconspicuous (bractlets tomentose).

Heads

20–70(–100+) in corymbiform arrays.

8–15+ in corymbiform arrays.

Cypselae

0.75–1 mm, hirsute on ribs;

pappi 2.5–3 mm.

2.5–3.5+ mm, glabrous;

pappi 4.5–7 mm.

2n

= 44.

= 46, 92.

Packera anonyma

Packera cana

Phenology Flowering early Jun–mid Jul (north), early Apr–late May (south). Flowering late Jun (south)–mid Aug (north).
Habitat Open fields, meadows, roadsides, disturbed sites, in drying or sandy soils Open plains and sagebrush associations, dry rocky slopes and crevices in granitic and limestone outcrops
Elevation 50–1800 m (200–5900 ft) 200–3700 m (700–12100 ft)
Distribution
from FNA
AL; AR; DC; FL; GA; KY; LA; MD; MS; NC; NY; OH; PA; SC; TN; VA; WV
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; CO; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
[WildflowerSearch map]
[BONAP county map]
Discussion

Packera anonyma is common, almost weedy throughout most of its range. It grows on serpentine in Maryland, Ohio, and Pennsylvania. In western parts of its range, putative hybrids between P. anonyma and P. plattensis and P. tomentosa have been reported.

(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. 578. FNA vol. 20, p. 580.
Parent taxa Asteraceae > tribe Senecioneae > Packera Asteraceae > tribe Senecioneae > Packera
Sibling taxa
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. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, 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. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
Synonyms Senecio anonymus, Senecio aureus var. angustifolius, Senecio earlei, Senecio smallii 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 (Alph. Wood) W. A. Weber & Á. Löve: Phytologia 49: 45. (1981) (Hooker) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981)
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