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Oak Creek ragwort

Habit Perennials, 60–100+ cm; taprooted (caudices subligneous, ascending to erect).
Stems

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

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.

Cauline leaves

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

Peduncles

ebracteate, glabrous.

Ray florets

(8–)13;

corolla laminae 6–10+ mm.

Disc florets

60–70+;

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

Phyllaries

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

Calyculi

inconspicuous.

Heads

15–40+ in open, cymiform arrays.

Cypselae

1.5–2 mm, glabrous or ± scabrellous;

pappi 5.5–6.5 mm.

2n

= 92.

Packera quercetorum

Phenology Flowering mid Apr–early Jun.
Habitat Rocky soils, open areas, scrub-oak and pinyon-pine forests, chaparral
Elevation 800–2200 m (2600–7200 ft)
Distribution
from FNA
AZ; NM
[WildflowerSearch map]
[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.)

Source FNA vol. 20, p. 598.
Parent taxa 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
Synonyms Senecio quercetorum, Senecio macropus
Name authority (Greene) C. Jeffrey: Kew Bull. 47: 101. (1992)
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