Packera quercetorum |
Packera layneae |
|
---|---|---|
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 |
AZ; NM
|
CA |
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 | ||
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) |
Web links |