Packera quercetorum |
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Oak Creek ragwort |
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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 |
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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 |
AZ; NM
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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 | |
Synonyms | Senecio quercetorum, Senecio macropus |
Name authority | (Greene) C. Jeffrey: Kew Bull. 47: 101. (1992) |
Web links |