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Oak Creek ragwort

Layne's ragwort

Habit Perennials, 60–100+ cm; taprooted (caudices subligneous, ascending to erect). Perennials, 40–70+ cm; taprooted (caudices erect to suberect, branched, stout).
Stems

1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils.

1 or 3–4+, clustered, sparsely tomentose to glabrescent.

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, relatively thick and turgid) petiolate;

blades narrowly elliptic or lanceolate to oblanceolate, 40–70+ × 5–20+ mm, bases tapering, margins entire or subentire to weakly and irregularly dentate (especially at apices).

Cauline leaves

gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised).

gradually reduced (distal sessile, bractlike).

Peduncles

ebracteate, glabrous.

bracteate (bractlets usually red-tipped), sparsely tomentose to glabrate.

Ray florets

(8–)13;

corolla laminae 6–10+ mm.

5 or 8;

corolla laminae 12–16 mm.

Disc florets

60–70+;

corolla tubes 2–3 mm, limbs 3.5–4.5 mm.

50–60+;

corolla tubes 3.5–4.5 mm, limbs 4.5–5.5 mm.

Phyllaries

(13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy).

13 or 21, dark green proximally, becoming light green distally (tips red), 7–11+ mm, floccose-tomentose proximally.

Calyculi

inconspicuous.

conspicuous (bractlets red-tipped).

Heads

15–40+ in open, cymiform arrays.

5–12+ in open, cymiform arrays.

Cypselae

1.5–2 mm, glabrous or ± scabrellous;

pappi 5.5–6.5 mm.

2.5–3.5 mm, glabrous;

pappi 7–8 mm.

2n

= 92.

= 92.

Packera quercetorum

Packera layneae

Phenology Flowering mid Apr–early Jun. Flowering early May–early Jul.
Habitat Rocky soils, open areas, scrub-oak and pinyon-pine forests, chaparral Openings, disturbed areas, in chaparral, serpentine soils
Elevation 800–2200 m (2600–7200 ft) 300–900 m (1000–3000 ft)
Distribution
from FNA
AZ; NM
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
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.)

Of conservation concern.

Packera layneae is known only from the foothills of the western slope of the Sierra Nevada.

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

Source FNA vol. 20, p. 598. FNA vol. 20, p. 590.
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. 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. 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 quercetorum, Senecio macropus Senecio layneae, Senecio fastigiatus var. layneae
Name authority (Greene) C. Jeffrey: Kew Bull. 47: 101. (1992) (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981)
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