Packera hesperia |
Packera anonyma |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
Small's ragwort |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 30–70+ cm; fibrous-rooted (caudices erect to ascending). |
Stems | 1, glabrous or sparsely tomentose. |
1 or 2–5, loosely clustered, bases densely tomentose, leaf axils usually tomentose. |
Basal leaves | (and proximal cauline) petiolate; blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate. |
petiolate; blades narrowly elliptic to oblanceolate, 30–90+ × 10–20+ mm, bases tapering, margins serrate to crenate-serrate (apices rounded to acute, faces glabrous). |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
gradually reduced (petiolate or sessile; elliptic to lanceolate, often pinnatifid). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
bracteate, distally tomentose. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
8 or 13; corolla laminae 5–7+ mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
45–60+; corolla tubes 1.5–2 mm, limbs 1.5–2 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
13 or 21, light green, 3–5 mm, glabrous. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
inconspicuous. |
Heads | 1–4+ in corymbiform arrays. |
20–70(–100+) in corymbiform arrays. |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
0.75–1 mm, hirsute on ribs; pappi 2.5–3 mm. |
2n | = 46. |
= 44. |
Packera hesperia |
Packera anonyma |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering early Jun–mid Jul (north), early Apr–late May (south). |
Habitat | Serpentine derived soils, open woodland scrub | Open fields, meadows, roadsides, disturbed sites, in drying or sandy soils |
Elevation | 500–2500 m (1600–8200 ft) | 50–1800 m (200–5900 ft) |
Distribution |
CA; OR
|
AL; AR; DC; FL; GA; KY; LA; MD; MS; NC; NY; OH; PA; SC; TN; VA; WV
|
Discussion | Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera anonyma is common, almost weedy throughout most of its range. It grows on serpentine in Maryland, Ohio, and Pennsylvania. In western parts of its range, putative hybrids between P. anonyma and P. plattensis and P. tomentosa have been reported. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 578. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio anonymus, Senecio aureus var. angustifolius, Senecio earlei, Senecio smallii |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Alph. Wood) W. A. Weber & Á. Löve: Phytologia 49: 45. (1981) |
Web links |