Packera schweinitziana |
Packera ogotorukensis |
|
---|---|---|
New England groundsel, Schweinitz's groundsel, Schweinitz's ragwort |
Ogotoruk Creek butterweed, Ogotoruk Creek ragwort |
|
Habit | Perennials, 40–70+ cm, fibrous-rooted and/or rhizomatous (rhizomes weakly branched). | Perennials, 8–15+ cm; fibrous-rooted or ± rhizomatous (bases horizontal to ascending). |
Stems | 1, glabrous or leaf axils sparsely tomentose. |
1 (often branched proximally, sometimes distally), sparsely to densely floccose-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). |
petiolate; blades elliptic to oblanceolate or ovate, 20–80+ × 20–60+ mm, bases tapering, margins entire, crenate-serrate, or irregularly to pinnately lobed (abaxial faces white-tomentose, adaxials patchy tomentose to glabrate). |
Cauline leaves | gradually reduced (± sessile; lacerate to subcrenate). |
gradually to abruptly reduced (sessile; mids lanceolate to oblanceolate, irregularly serrate to pinnately lobed, distals bractlike). |
Peduncles | bracteate, glabrous. |
bracteate, ± tomentose. |
Ray florets | 8–13; corolla laminae 4–7 mm. |
10–13+; corolla laminae 8–12+ mm. |
Disc florets | 50–70+; corolla tubes 3.5–4 mm, limbs 3–3.5 mm. |
60–70+; corolla tubes 1–1.5 mm, limbs 2–2.5 mm. |
Phyllaries | 13 or 21, light green (tips sometimes black), 5–8 mm, glabrous. |
13 or 21, green (sometimes with purple streaks, tips usually purple), 4–8 mm, proximally tomentose, rarely glabrous. |
Calyculi | conspicuous. |
conspicuous (bractlets purple-tinged). |
Heads | 8–20+ in loose, corymbiform arrays. |
1(–3). |
Cypselae | 1–1.5 mm, glabrous; pappi 5–5.5 mm. |
1–1.5 mm, glabrous; pappi 2.5–3 mm. |
2n | = 44. |
= 92. |
Packera schweinitziana |
Packera ogotorukensis |
|
Phenology | Flowering May–Jul. | Flowering mid Jun–mid Jul (maritime), early Jul–early Aug (continental). |
Habitat | Sunny, wet areas, meadows, swamps, ditches, roadsides | Open rocky/gravelly areas, tundra, talus slopes, stream banks, roadsides |
Elevation | 100–1800 m (300–5900 ft) | 0–1800 m (0–5900 ft) |
Distribution |
ME; NC; NH; NY; TN; VT; NB; NS; PE; QC
|
AK; BC; NT; YT |
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.) |
Plants of Packera ogotorukensis have been treated as a disjunct of P. conterminus (as Senecio conterminus). Gross morphology, cytological data, and pollen morphology all provide good evidence for recognition of P. ogotorukensis as a distinct species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 598. | FNA vol. 20, p. 594. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio schweinitzianus, Senecio aureus var. lanceolatus, Senecio robbinsii | Senecio ogotorukensis |
Name authority | (Nuttall) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (Packer) Á. Löve & D. Löve: Bot. Not. 128: 520. (1976) |
Web links |