Flora of North America species comparison

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Packera tomentosa

Packera macounii

woolly ragwort

long-ray groundsel, Macoun's butterweed, Macoun's groundsel, Puget butterweed, Siskiyou Mountain ragwort, Siskiyou Mountains ragwort
Habit Perennials, 30–60+ cm; taprooted (caudices relatively thick, weakly ascending or erect), sometimes stoloniferous. Perennials, 30–40+ cm; taprooted (caudices ± branched, becoming rhizomiform).
Stems

1, densely lanate-tomentose proximally, floccose-tomentose to glabrescent distally.

1, sparsely to densely tomentose or glabrescent.
Basal leaves

(and proximal cauline) petiolate;

blades lanceolate to narrowly ovate or elliptic, 40–120+ × 20–50+ mm, bases tapering, sometimes oblique, margins subentire, crenate, or serrate-dentate.

(and proximal) petiolate;

blades lanceolate to oblanceolate, 30–50+ × 10–20 mm, bases tapering, margins entire or shallowly toothed (slightly revolute).
Cauline leaves

gradually reduced (± petiolate or sessile, weakly clasping; dentate to pinnately lobed).

gradually reduced (distal sessile, bractlike).
Peduncles

bracteate, sparsely to densely tomentose.

inconspicuously bracteate or ebracteate, sparsely tomentose to glabrate.
Ray florets

10 or 13;

corolla laminae 6–8+ mm.

8(–13);

corolla laminae 8–10+ mm.
Disc florets

50–60+;

corolla tubes 3.5–4 mm, limbs 3–3.5 mm.

30–40+;

corolla tubes 2.5–3.5 mm, limbs 2–3 mm.
Phyllaries

13 or 21, light green, 5–8 mm, usually glabrous (sometimes hairy proximally).

13 or 21, green, 5–7+ mm, glabrous.
Calyculi

inconspicuous.

0 or inconspicuous.
Heads

10–30+ in open, corymbiform arrays (more in robust individuals).

6–15+ in corymbiform arrays.
Cypselae

1–1.5 mm, hispid;

pappi 5–7 mm.

1.5–2 mm, glabrous;

pappi 4–5 mm.
2n

= 46.

= 46, 92.

Packera tomentosa

Packera macounii
Phenology Flowering (Mar–)May–early Jun. Flowering early May–early Jul.
Habitat Open meadows, roadways, sandy or shallow soils overlying granitic outcrops Along streams, roadsides, clearings, disturbed sites, rocky soils, coniferous woodlands
Elevation 0–500 m (0–1600 ft) 400–1400 m (1300–4600 ft)
Distribution
from FNA
AL; AR; DE; FL; GA; LA; MD; NC; NJ; OK; SC; TX; VA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Packera tomentosa is common throughout most of its range. The basal and proximal cauline leaves are held at about 45 degrees to the stems.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Packera macounii is similar in overall morphology to P. cana. Leaves of P. macounii are narrower and frequently revolute. It is often cited as being collected on serpentine soils; it is not restricted to them. Senecio fastigiatus Nuttall (1840) is a later homonym of S. fastigiatus Schweinitz ex Elliott (1823), a name of uncertain application.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 601. FNA vol. 20, p. 591.
Parent taxa Asteraceae > tribe Senecioneae > Packera Asteraceae > tribe Senecioneae > Packera
Sibling taxa
P. anonyma, 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. tridenticulata, P. werneriifolia
P. anonyma, 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. 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 tomentosus, Cineraria integrifolia var. minor, S. alabamensis Senecio macounii, Senecio fastigiatus, Senecio fastigiatus subsp. macounii, Senecio leucocrinus, Senecio ligulifolius, Senecio spatuliformis
Name authority (Michaux) C. Jeffrey: Kew Bull. 47: 101. (1992) (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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