Packera schweinitziana |
Packera millelobata |
|
---|---|---|
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort |
Uinta ragwort |
|
Habit | Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). | Perennials, 30–50+ cm; taprooted or ± rhizomatous (bases weakly creeping, horizontal to erect). |
Stems | 1, glabrous or leaf axils sparsely tomentose. |
1 or 2–5+, loosely clustered, glabrous or leaf axils sparsely tomentose. |
Basal leaves | (and proximal cauline) petiolate; blades narrowly ovate to oblong-lanceolate, 30–70+ × 10–20+ mm, bases abruptly contracted to subcordate, margins usually serrate-dentate, sometimes subcrenate (apices acute). |
(and proximal cauline) petiolate; blades narrowly lanceolate (pinnatifid, lateral lobes 6+ pairs, their bases petioluliform, terminal lobes smaller than laterals), 60–100 × 10–20 mm, bases tapering, ultimate margins dentate. |
Cauline leaves | gradually reduced (± sessile; lacerate to subcrenate). |
gradually reduced (sessile). |
Peduncles | bracteate, glabrous. |
bracteate or ebracteate, glabrous. |
Ray florets | 8–13; corolla laminae 4–7 mm. |
(8–)13; corolla laminae 8–10+ mm. |
Disc florets | 50–70+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. |
40–55+; corolla tubes 2–3 mm, limbs 2–3 mm. |
Phyllaries | 13 or 21, light green (tips sometimes black), 5–8 mm, glabrous. |
(13–)21, green (tips yellow), 4–6+ mm, glabrous. |
Calyculi | conspicuous. |
inconspicuous. |
Heads | 8–20+ in loose, corymbiform arrays. |
6–20+ in corymbiform arrays. |
Cypselae | 1–1.5 mm, glabrous; pappi 5–5.5 mm. |
1–1.5 mm, hirtellous on ribs; pappi 3.5–4.5 mm. |
2n | = 44. |
|
Packera schweinitziana |
Packera millelobata |
|
Phenology | Flowering May–Jul. | Flowering late Mar–early Jun. |
Habitat | Sunny, wet areas, meadows, swamps, ditches, roadsides | Streambeds, openings in wooded areas on limestone-derived soils or on igneous-derived soils that are damp during growing season |
Elevation | 100–1800 m (300–5900 ft) | 1400–2100 m (4600–6900 ft) |
Distribution |
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
|
TX; Mexico (Chihuahua, Coahuila) |
Discussion | Packera schweinitziana is rarely mistaken for any other taxon. It grows on slightly acidic soils and may reproduce vegetatively by branched rhizomes. The group of populations on Roan Mountain on the Tennessee-North Carolina border is disjunct from the main distribution. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
In the flora area, Packera millelobata occurs only in the trans-Pecos region of western Texas. It has been confused with P. tampicana. Their ranges overlap along the Rio Grande; P. millelobata has leaves with narrow terminal lobes; P. tampicana has terminal lobes as wide as the leaf blade. In addition, P. tampicana is annual with pronounced taproots; P. millelobata is perennial with taprooted caudices. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 598. | FNA vol. 20, p. 592. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio schweinitzianus, Senecio aureus var. lanceolatus, Senecio robbinsii | Senecio millelobatus |
Name authority | (Nuttall) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
Web links |