Packera glabella |
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butterweed |
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Habit | Annuals or biennials, 20–70+ cm; fibrous-rooted (caudices relatively short, weak). |
Stems | 1 (striated, frequently hollow, often pink- to purple-tinged), 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. |
Cauline leaves | gradually reduced (weakly clasping, similar to basal). |
Peduncles | bracteate, glabrous or bases tomentose. |
Ray florets | (8–)13; corolla laminae 7–9 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 2–3 mm. |
Phyllaries | (13–)21, green, 5–7 mm, glabrous. |
Calyculi | conspicuous (bractlets 2.5–4 mm). |
Heads | 8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays). |
Cypselae | 1–1.5 mm, sparsely hirtellous on ribs or glabrous; pappi 3–4 mm. |
2n | = 46. |
Packera glabella |
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Phenology | Flowering (Feb–)mid Mar–late May. |
Habitat | Open wet areas, edges of woodlands, stream banks, roadsides, meadows, marshes, fallow fields |
Elevation | 0–600 m (0–2000 ft) |
Distribution |
AL; AR; FL; GA; IL; IN; KS; KY; LA; MO; MS; NC; NE; OH; OK; SC; TN; TX
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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.) |
Source | FNA vol. 20, p. 588. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | |
Synonyms | Senecio glabellus, Senecio carolinianus, Senecio densiflorus, Senecio lobatus, Senecio lyratus, Senecio mississipianus |
Name authority | (Poiret) C. Jeffrey: Kew Bull. 47: 101. (1992) |
Web links |