Packera multilobata |
Packera glabella |
|
---|---|---|
lobeleaf groundsel |
butterweed |
|
Habit | Biennials or perennials, 20–40+ cm; taprooted (caudices ascending to erect, weakly branched). | Annuals or biennials, 20–70+ cm; fibrous-rooted (caudices relatively short, weak). |
Stems | 1 or 2–5, loosely clustered, usually glabrous or glabrescent, sometimes sparsely tomentose throughout, axils (basal leaves) tomentose. |
1 (striated, frequently hollow, often pink- to purple-tinged), glabrous or leaf axils 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) 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 | gradually reduced (sessile). |
gradually reduced (weakly clasping, similar to basal). |
Peduncles | conspicuously bracteate, glabrous or tomentose. |
bracteate, glabrous or bases tomentose. |
Ray florets | 8–13; corolla laminae 7–10 mm. |
(8–)13; corolla laminae 7–9 mm. |
Disc florets | 40–50+; corolla tubes 4–5 mm, limbs 3–4 mm. |
35–50+; corolla tubes 2.5–3.5 mm, limbs 2–3 mm. |
Phyllaries | 13–21, green (tips often yellow), 4–9+ mm, glabrous or sparsely tomentose (at least proximally). |
(13–)21, green, 5–7 mm, glabrous. |
Calyculi | conspicuous. |
conspicuous (bractlets 2.5–4 mm). |
Heads | 10–30+ in open, corymbiform or subumbelliform arrays. |
8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays). |
Cypselae | 2–3 mm, glabrous or hirtellous on ribs; pappi 5–6 mm. |
1–1.5 mm, sparsely hirtellous on ribs or glabrous; pappi 3–4 mm. |
2n | = 46, 92. |
= 46. |
Packera multilobata |
Packera glabella |
|
Phenology | Flowering early May–mid Jul. | Flowering (Feb–)mid Mar–late May. |
Habitat | Dry rocky or sandy soils in sagebrush, woodlands, and subalpine areas | Open wet areas, edges of woodlands, stream banks, roadsides, meadows, marshes, fallow fields |
Elevation | 1200–2900 m (3900–9500 ft) | 0–600 m (0–2000 ft) |
Distribution |
AZ; CA; CO; ID; NM; NV; UT; WY
|
AL; AR; FL; GA; IL; IN; KS; KY; LA; MO; MS; NC; NE; OH; OK; SC; TN; TX
|
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.) |
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. 592. | FNA vol. 20, p. 588. |
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 glabellus, Senecio carolinianus, Senecio densiflorus, Senecio lobatus, Senecio lyratus, Senecio mississipianus |
Name authority | (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Poiret) C. Jeffrey: Kew Bull. 47: 101. (1992) |
Web links |