Packera glabella

(Poiret) C. Jeffrey

Kew Bull. 47: 101. 1992.

Common names: Butterweed
IllustratedEndemic
Basionym: Senecio glabellus Poiret in J. Lamarck et al., Encycl. 7: 102. 1806 Senecio lyratus Michaux 1803
Synonyms: Senecio carolinianus Sprengel Senecio densiflorus M. Martens Senecio lobatus Persoon Senecio mississipianus de Candolle
Treatment appears in FNA Volume 20. Treatment on page 588. Mentioned on page 548, 575, 601.

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). Heads 8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays). Peduncles bracteate, glabrous or bases tomentose. Calyculi conspicuous (bractlets 2.5–4 mm). Phyllaries (13–) 21, green, 5–7 mm, glabrous. Ray-florets (8–) 13; corolla laminae 7–9 mm. Disc-florets 35–50+; corolla-tubes 2.5–3.5 mm, limbs 2–3 mm. Cypselae 1–1.5 mm, sparsely hirtellous on ribs or glabrous; pappi 3–4 mm. 2n = 46.


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

Distribution

V20-1311-distribution-map.gif

Ala., Ark., Fla., Ga., Ill., Ind., Kans., Ky., La., Miss., Mo., Nebr., N.C., Ohio, Okla., S.C., Tenn., Tex.

Discussion

Packera glabella is common and almost weedy in wet, partially shaded places. The hollow, striated stems of P. glabella are distinctive.

Selected References

None.

Lower Taxa

None.
... more about "Packera glabella"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
cymiform +  and umbelliform +
indeterminate +  and determinate +
Debra K. Trock +
(Poiret) C. Jeffrey +
tapering +
Senecio glabellus +  and Senecio lyratus +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
lyrate;obovate;oblanceolate +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
winged;nerved;ribbed +
Butterweed +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
pale-yellow +  and deep orange-red +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
glabrous +  and hirtellous +
cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
Ala. +, Ark. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Miss. +, Mo. +, Nebr. +, N.C. +, Ohio +, Okla. +, S.C. +, Tenn. +  and Tex. +
0–600 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open wet areas, edges of woodlands, stream banks, roadsides, meadows, marshes, fallow fields +
discoid +  and radiate +
in compact or congested to open corymbiform cymiform or subumbelliform , , , arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
campanulate;cylindric +
sessile +  and petiolate +
cauline +  and basal +
erect;recurved +
deltate +
dentate to pinnatifid +  and entire +
2-carpellate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering (Feb–)mid Mar–late May. +
linear +  and ensiform +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
bearing subulate enations +, hairy +  and bristly +
conic;usually flat;convex +
exalbuminous +
Illustrated +  and Endemic +
prostrate +  and ascending +
appendaged +  and truncate +
papillate +
Senecio carolinianus +, Senecio densiflorus +, Senecio lobatus +  and Senecio mississipianus +
Packera glabella +
species +
campanulate +
crenate +  and irregularly undulate +
biennial +  and annual +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
vine +, tree +, shrub +  and subshrub +
23 +, 22 +  and 20 +