Packera quercetorum |
Packera musiniensis |
|
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Oak Creek ragwort |
|
|
Habit | Perennials, 60–100+ cm; taprooted (caudices subligneous, ascending to erect). | Perennials, 5–10 cm; ± rhizomatous (bases loosely branched, elongated, horizontal to ascending). |
Stems | 1 or 2–4, clustered (proximally deeply purple-tinged, distally lightly tinged), glabrous or tomentose at bases and in leaf axils. |
1 (sometimes branched from bases), densely white- or gray-tomentose. |
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. |
petiolate; blades oblanceolate, 20–30+ × 5–13+ mm, bases tapering, margins pinnatifid to crenate. |
Cauline leaves | gradually reduced (petiolate or sessile; shallowly lobed, midribs ± winged, distals bractlike, dentate to incised). |
gradually reduced (sessile; proximal and mid nearly equaling basals, distals bractlike). |
Peduncles | ebracteate, glabrous. |
ebracteate, tomentose. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
0 or 1; corolla laminae ca. 6 mm. |
Disc florets | 60–70+; corolla tubes 2–3 mm, limbs 3.5–4.5 mm. |
not seen. |
Phyllaries | (13–)21, green (tips yellow), 5–7 mm, glabrous (tips sometimes hairy). |
8–13, yellow-green to purple (or with purplish midstripes), 8–9.5 mm, sparsely tomentose (apices rounded). |
Calyculi | inconspicuous. |
0 or inconspicuous. |
Heads | 15–40+ in open, cymiform arrays. |
3–15+ in corymbiform arrays. |
Cypselae | 1.5–2 mm, glabrous or ± scabrellous; pappi 5.5–6.5 mm. |
not seen (reported to be glabrous). |
2n | = 92. |
= 46. |
Packera quercetorum |
Packera musiniensis |
|
Phenology | Flowering mid Apr–early Jun. | Flowering mid Jul–mid Aug. |
Habitat | Rocky soils, open areas, scrub-oak and pinyon-pine forests, chaparral | Subalpine and alpine ridges, talus or scree slopes, barren areas on Flagstaff limestone |
Elevation | 800–2200 m (2600–7200 ft) | 2900–3300 m (9500–10800 ft) |
Distribution |
AZ; NM
|
UT |
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 musiniensis is a high-elevation dwarf species; its affinities within Packera are still uncertain. Welsh believed it to be allied to P. cana or P. multilobata, or both. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 598. | FNA vol. 20, p. 592. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio quercetorum, Senecio macropus | Senecio musiniensis |
Name authority | (Greene) C. Jeffrey: Kew Bull. 47: 101. (1992) | (S. L. Welsh) Trock: Sida 21: 1643. (2005) |
Web links |