Packera multilobata |
Packera hesperia |
|
---|---|---|
lobeleaf groundsel |
serpentine groundsel, Siskiyou butterweed, western ragwort |
|
Habit | Biennials or perennials, 20–40+ cm; taprooted (caudices ascending to erect, weakly branched). | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). |
Stems | 1 or 2–5, loosely clustered, usually glabrous or glabrescent, sometimes sparsely tomentose throughout, axils (basal leaves) tomentose. |
1, glabrous or sparsely tomentose. |
Basal leaves | (and proximal cauline) petiolate; blades obovate, oblanceolate, spatulate, or lyrate to sublyrate (± pinnately lobed, lateral lobes 3–6 pairs, smaller than terminal lobes), 40–80+ × 10–30+ mm, bases tapering, ultimate margins incised to dentate. |
(and proximal cauline) petiolate; blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate. |
Cauline leaves | gradually reduced (sessile). |
abruptly reduced (sessile, clasping; bractlike, entire). |
Peduncles | conspicuously bracteate, glabrous or tomentose. |
bracteate (bractlets red-tinged), densely lanate-tomentose. |
Ray florets | 8–13; corolla laminae 7–10 mm. |
(8–)13; corolla laminae 6–10+ mm. |
Disc florets | 40–50+; corolla tubes 4–5 mm, limbs 3–4 mm. |
35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
Phyllaries | 13–21, green (tips often yellow), 4–9+ mm, glabrous or sparsely tomentose (at least proximally). |
(13–)21, green (tips red or dark red), densely tomentose proximally. |
Calyculi | conspicuous. |
conspicuous (bractlets narrow, red-tinged). |
Heads | 10–30+ in open, corymbiform or subumbelliform arrays. |
1–4+ in corymbiform arrays. |
Cypselae | 2–3 mm, glabrous or hirtellous on ribs; pappi 5–6 mm. |
1.5–2 mm, glabrous; pappi 5–6 mm. |
2n | = 46, 92. |
= 46. |
Packera multilobata |
Packera hesperia |
|
Phenology | Flowering early May–mid Jul. | Flowering mid Apr–mid Jun. |
Habitat | Dry rocky or sandy soils in sagebrush, woodlands, and subalpine areas | Serpentine derived soils, open woodland scrub |
Elevation | 1200–2900 m (3900–9500 ft) | 500–2500 m (1600–8200 ft) |
Distribution |
AZ; CA; CO; ID; NM; NV; UT; WY
|
CA; OR
|
Discussion | Packera multilobata is abundant and widespread west of the Continental Divide. Both morphology and habitat vary. In colder parts of its range, plants are shorter, caudices are better developed with clustered stems, and leaf lobes are larger. In desert-like habitats, basal leaves are narrower and more finely lobed, the tomentum is often persistent, and stems are usually single. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 592. | FNA vol. 20, p. 589. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio multilobatus, Senecio leucoreus, Senecio lynceus, Senecio nelsonii var. uintahensis, Senecio prolixus, Senecio stygius, Senecio thornberi, Senecio uintahensis | Senecio hesperius, Senecio auleticus |
Name authority | (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
Web links |