Packera glabella |
Packera tampicana |
|
---|---|---|
butterweed |
Great Plains ragwort |
|
Habit | Annuals or biennials, 20–70+ cm; fibrous-rooted (caudices relatively short, weak). | Annuals, 20–50+ cm; taprooted (caudices ascending to erect). |
Stems | 1 (striated, frequently hollow, often pink- to purple-tinged), glabrous or leaf axils sparsely tomentose. |
1 or 2–6+, clustered (bases cyanic), glabrous or leaf axils sparsely tomentose. |
Basal leaves | (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. |
(and proximal cauline) petiolate; blades oblanceolate to spatulate (usually pinnately lobed, lateral lobes 1–6+ pairs, their bases petioluliform, terminal lobes usually larger than laterals, often reniform to ± orbiculate, midribs sometimes ± winged and/or toothed between the primary lobes), 40–120+ × 10–30+ mm, bases ± cuneate, ultimate margins subentire or irregularly crenate, dentate, or lobed. |
Cauline leaves | gradually reduced (weakly clasping, similar to basal). |
gradually reduced (± petiolate or sessile, clasping; often auriculate, pinnately dissected to pinnately lobed). |
Peduncles | bracteate, glabrous or bases tomentose. |
bracteate, glabrous. |
Ray florets | (8–)13; corolla laminae 7–9 mm. |
8 or 13; corolla laminae 3–7 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 2–3 mm. |
30–45(–100+); corolla tubes 1.5–2.5 mm, limbs (1.5–)2.5–3.5 mm. |
Phyllaries | (13–)21, green, 5–7 mm, glabrous. |
13 or 21, green (tips sometimes reddish), 3–7 mm, glabrous. |
Calyculi | conspicuous (bractlets 2.5–4 mm). |
inconspicuous or 0. |
Heads | 8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays). |
4–25+ in corymbiform arrays. |
Cypselae | 1–1.5 mm, sparsely hirtellous on ribs or glabrous; pappi 3–4 mm. |
1–1.5 mm, hirtellous on ribs; pappi 3–5 mm. |
2n | = 46. |
= 46. |
Packera glabella |
Packera tampicana |
|
Phenology | Flowering (Feb–)mid Mar–late May. | Flowering Feb–Jun. |
Habitat | Open wet areas, edges of woodlands, stream banks, roadsides, meadows, marshes, fallow fields | Disturbed, wet, sandy or clay sites, roadsides, stream banks, waste areas |
Elevation | 0–600 m (0–2000 ft) | 0–1000 m (0–3300 ft) |
Distribution |
AL; AR; FL; GA; IL; IN; KS; KY; LA; MO; MS; NC; NE; OH; OK; SC; TN; TX
|
AR; KS; LA; OK; TX; Mexico
|
Discussion | 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.) |
Packera tampicana is fairly widespread along the Gulf Coastal Plain and north and in Mexico. Morphologically, P. tampicana most closely resembles P. glabella; the former grows in very wet, sandy or clay soils and open sunlight, the latter grows in drier habitats, usually in partial shade. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 588. | FNA vol. 20, p. 600. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio glabellus, Senecio carolinianus, Senecio densiflorus, Senecio lobatus, Senecio lyratus, Senecio mississipianus | Senecio tampicanus, Senecio greggii, Senecio imparipinnatus |
Name authority | (Poiret) C. Jeffrey: Kew Bull. 47: 101. (1992) | (de Candolle) C. Jeffrey: Kew Bull. 47: 101. (1992) |
Web links |