Packera hesperia |
Packera glabella |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
butterweed |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Annuals or biennials, 20–70+ cm; fibrous-rooted (caudices relatively short, weak). |
Stems | 1, glabrous or sparsely tomentose. |
1 (striated, frequently hollow, often pink- to purple-tinged), glabrous or leaf axils sparsely 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. |
(and proximal cauline) obscurely petiolate; blades obovate to oblanceolate, sometimes lyrate (lateral lobes to 5 pairs, terminal lobes larger than laterals), 50–150+ × 10–30+ mm, bases tapering, ultimate margins crenate to irregularly undulate. |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
gradually reduced (weakly clasping, similar to basal). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
bracteate, glabrous or bases tomentose. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
(8–)13; corolla laminae 7–9 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
35–50+; corolla tubes 2.5–3.5 mm, limbs 2–3 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
(13–)21, green, 5–7 mm, glabrous. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
conspicuous (bractlets 2.5–4 mm). |
Heads | 1–4+ in corymbiform arrays. |
8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays). |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
1–1.5 mm, sparsely hirtellous on ribs or glabrous; pappi 3–4 mm. |
2n | = 46. |
= 46. |
Packera hesperia |
Packera glabella |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering (Feb–)mid Mar–late May. |
Habitat | Serpentine derived soils, open woodland scrub | Open wet areas, edges of woodlands, stream banks, roadsides, meadows, marshes, fallow fields |
Elevation | 500–2500 m (1600–8200 ft) | 0–600 m (0–2000 ft) |
Distribution |
CA; OR
|
AL; AR; FL; GA; IL; IN; KS; KY; LA; MO; MS; NC; NE; OH; OK; SC; TN; TX
|
Discussion | Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera glabella is common and almost weedy in wet, partially shaded places. The hollow, striated stems of P. glabella are distinctive. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 588. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio glabellus, Senecio carolinianus, Senecio densiflorus, Senecio lobatus, Senecio lyratus, Senecio mississipianus |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Poiret) C. Jeffrey: Kew Bull. 47: 101. (1992) |
Web links |