Packera tampicana |
Packera millefolium |
|
---|---|---|
Great Plains ragwort |
Piedmont ragwort |
|
Habit | Annuals, 20–50+ cm; taprooted (caudices ascending to erect). | Perennials, 25–60+ cm; fibrous-rooted (caudices branched). |
Stems | 1 or 2–6+, clustered (bases cyanic), glabrous or leaf axils sparsely tomentose. |
1 or 2–3, clustered, glabrous or leaf axils sparsely hairy. |
Basal leaves | (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. |
(and proximal cauline) petiolate; blades narrowly ovate to ovate (2–3 times pinnately dissected, ultimate lobes mostly linear to filiform), 50–80 × 30–50 mm, bases ± truncate or auriculate, ultimate margins entire or remotely dentate. |
Cauline leaves | gradually reduced (± petiolate or sessile, clasping; often auriculate, pinnately dissected to pinnately lobed). |
gradually reduced (petiolate or sessile, similar to basals). |
Peduncles | bracteate, glabrous. |
bracteate or ebracteate, glabrous. |
Ray florets | 8 or 13; corolla laminae 3–7 mm. |
8–10(–13); corolla laminae 8–12 mm. |
Disc florets | 30–45(–100+); corolla tubes 1.5–2.5 mm, limbs (1.5–)2.5–3.5 mm. |
35–50+; corolla tubes 2–3 mm, limbs 1.5–2.5 mm. |
Phyllaries | 13 or 21, green (tips sometimes reddish), 3–7 mm, glabrous. |
(13–)21, green, 4–6 mm, glabrous (tips sometimes hair-tufted). |
Calyculi | inconspicuous or 0. |
0. |
Heads | 4–25+ in corymbiform arrays. |
10–30+ in open, corymbiform arrays. |
Cypselae | 1–1.5 mm, hirtellous on ribs; pappi 3–5 mm. |
0.75–1.5 mm, hairy on ribs; pappi 3–4 mm. |
2n | = 46. |
|
Packera tampicana |
Packera millefolium |
|
Phenology | Flowering Feb–Jun. | Flowering early May–mid Jun. |
Habitat | Disturbed, wet, sandy or clay sites, roadsides, stream banks, waste areas | Open areas along streams, rock outcrops in thin, granitic-derived soils |
Elevation | 0–1000 m (0–3300 ft) | 400–900 m (1300–3000 ft) |
Distribution |
AR; KS; LA; OK; TX; Mexico
|
GA; NC; SC; VA |
Discussion | 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.) |
Of conservation concern. Packera millefolia is known only from granitic soils in the southern Appalachians. It is similar in overall aspect to the widespread P. anonyma; it differs by its 2–3 times pinnately dissected leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 600. | FNA vol. 20, p. 591. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio tampicanus, Senecio greggii, Senecio imparipinnatus | Senecio millefolium, Senecio memmingeri |
Name authority | (de Candolle) C. Jeffrey: Kew Bull. 47: 101. (1992) | (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
Web links |