Flora of North America species comparison

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Packera hesperia

Packera macounii

serpentine groundsel, Siskiyou butterweed, western ragwort

long-ray groundsel, Macoun's butterweed, Macoun's groundsel, Puget butterweed, Siskiyou Mountain ragwort, Siskiyou Mountains ragwort
Habit Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). Perennials, 30–40+ cm; taprooted (caudices ± branched, becoming rhizomiform).
Stems

1, glabrous or sparsely tomentose.

1, sparsely to densely tomentose or glabrescent.
Basal leaves

(and proximal cauline) petiolate;

blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate.

(and proximal) petiolate;

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

abruptly reduced (sessile, clasping; bractlike, entire).

gradually reduced (distal sessile, bractlike).
Peduncles

bracteate (bractlets red-tinged), densely lanate-tomentose.

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

(8–)13;

corolla laminae 6–10+ mm.

8(–13);

corolla laminae 8–10+ mm.
Disc florets

35–50+;

corolla tubes 2.5–3.5 mm, limbs 3–4 mm.

30–40+;

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

(13–)21, green (tips red or dark red), densely tomentose proximally.

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

conspicuous (bractlets narrow, red-tinged).

0 or inconspicuous.
Heads

1–4+ in corymbiform arrays.

6–15+ in corymbiform arrays.
Cypselae

1.5–2 mm, glabrous;

pappi 5–6 mm.

1.5–2 mm, glabrous;

pappi 4–5 mm.
2n

= 46.

= 46, 92.

Packera hesperia

Packera macounii
Phenology Flowering mid Apr–mid Jun. Flowering early May–early Jul.
Habitat Serpentine derived soils, open woodland scrub Along streams, roadsides, clearings, disturbed sites, rocky soils, coniferous woodlands
Elevation 500–2500 m (1600–8200 ft) 400–1400 m (1300–4600 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Packera hesperia is known only from the Siskiyou Mountains.

(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. 589. 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. 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. 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 hesperius, Senecio auleticus Senecio macounii, Senecio fastigiatus, Senecio fastigiatus subsp. macounii, Senecio leucocrinus, Senecio ligulifolius, Senecio spatuliformis
Name authority (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) (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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