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Image of Oak Creek ragwort
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Oak Creek Ragwort

Packera quercetorum (Greene) C. Jeffrey

Comments

provided by eFloras
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.
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 575, 598 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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eFloras.org
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Description

provided by eFloras
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). Heads 15–40+ in open, cymiform arrays. Peduncles ebracteate, glabrous. Calyculi inconspicuous. Phyllaries (13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy). Ray florets (8–)13; corolla laminae 6–10+ mm. Disc florets 60–70+; corolla tubes 2–3 mm, limbs 3.5–4.5 mm. Cypselae 1.5–2 mm, glabrous or ± scabrellous; pappi 5.5–6.5 mm. 2n = 92.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 575, 598 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Synonym

provided by eFloras
Senecio quercetorum Greene, Leafl. Bot. Observ. Crit. 2: 20. 1909; S. macropus Greenman
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 575, 598 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras