Packera tampicana |
Packera dimorphophylla |
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Great Plains ragwort |
splitleaf groundsel |
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Habit | Annuals, 20–50+ cm; taprooted (caudices ascending to erect). | Perennials, 10–30+ cm; fibrous-rooted (caudices horizontal to erect, relatively short and stout). | ||||||||
Stems | 1 or 2–6+, clustered (bases cyanic), glabrous or leaf axils sparsely tomentose. |
usually 1, rarely 2–3, clustered, glabrous. |
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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. |
(relatively thick and turgid) petiolate (petioles broad-winged or narrow, delicate); blades ovate, ovate-orbiculate, oblong-lanceolate, orbiculate, suborbiculate, reniform, or subreniform, 10–50+ × 10–40 mm, bases tapering or subcordate to abruptly contracted, margins entire or crenate. |
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Cauline leaves | gradually reduced (± petiolate or sessile, clasping; often auriculate, pinnately dissected to pinnately lobed). |
gradually reduced (proximal and mid sometimes as large as or larger than basal, sessile, oblanceolate to obovate, sometimes lyrate, sometimes auriculate and/or clasping, subentire to irregularly dissected; distal usually sessile, bractlike, sometimes larger). |
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Peduncles | bracteate, glabrous. |
inconspicuously bracteate or ebracteate, glabrous. |
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Ray florets | 8 or 13; corolla laminae 3–7 mm. |
8 or 13; corolla laminae (deep yellow to orange) 5–8+ mm. |
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Disc florets | 30–45(–100+); corolla tubes 1.5–2.5 mm, limbs (1.5–)2.5–3.5 mm. |
45–60+; corolla tubes 2–3 mm, limbs 2.5–3.5 mm. |
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Phyllaries | 13 or 21, green (tips sometimes reddish), 3–7 mm, glabrous. |
(8–)13 or 21, green (tips cyanic), 5–7+ mm, glabrous. |
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Calyculi | inconspicuous or 0. |
conspicuous (bases of bractlets swollen). |
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Heads | 4–25+ in corymbiform arrays. |
1–6+ in congested, corymbiform or subumbelliform arrays. |
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Cypselae | 1–1.5 mm, hirtellous on ribs; pappi 3–5 mm. |
0.75–1.5 mm, glabrous, pappi 3–4 mm. |
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2n | = 46. |
= 46. |
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Packera tampicana |
Packera dimorphophylla |
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Phenology | Flowering Feb–Jun. | |||||||||
Habitat | Disturbed, wet, sandy or clay sites, roadsides, stream banks, waste areas | |||||||||
Elevation | 0–1000 m (0–3300 ft) | |||||||||
Distribution |
AR; KS; LA; OK; TX; Mexico
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CO; ID; MT; NM; NV; UT; WY
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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.) |
Varieties 3 (3 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 600. | FNA vol. 20, p. 584. | ||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Senecio tampicanus, Senecio greggii, Senecio imparipinnatus | Senecio dimorphophyllus | ||||||||
Name authority | (de Candolle) C. Jeffrey: Kew Bull. 47: 101. (1992) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | ||||||||
Web links |