Packera tampicana |
Packera bolanderi |
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Great Plains ragwort |
Bolander's groundsel, Bolander's ragwort |
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Habit | Annuals, 20–50+ cm; taprooted (caudices ascending to erect). | Perennials, 20–50+ cm; fibrous-rooted (caudices creeping). | ||||
Stems | 1 or 2–6+, clustered (bases cyanic), glabrous or leaf axils sparsely tomentose. |
1 or 2–3, loosely 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. |
(and proximal cauline) petiolate; blades ± orbiculate to oblong, or lyrate (lateral lobes 1–3 pairs, sinuses usually rounded, midribs usually winged), 50–120+ × 30–70+ mm, bases cordate to subcordate, margins shallowly to deeply incised. |
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Cauline leaves | gradually reduced (± petiolate or sessile, clasping; often auriculate, pinnately dissected to pinnately lobed). |
gradually reduced (petiolate or sessile and clasping; lanceolate, incised). |
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Peduncles | bracteate, glabrous. |
ebracteate or inconspicuously bracteate, glabrous. |
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Ray florets | 8 or 13; corolla laminae 3–7 mm. |
8 or 13; corolla laminae 10–15+ 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. |
30–45+; corolla tubes 3–4 mm, limbs 3.5–4.5 mm. |
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Phyllaries | 13 or 21, green (tips sometimes reddish), 3–7 mm, glabrous. |
(8), 13, or 21, dark green, 5–8 mm, glabrous or sparsely tomentose proximally. |
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Calyculi | inconspicuous or 0. |
conspicuous. |
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Heads | 4–25+ in corymbiform arrays. |
8–15+ in corymbiform or subumbelliform arrays. |
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Cypselae | 1–1.5 mm, hirtellous on ribs; pappi 3–5 mm. |
2.5–3.5 mm, glabrous; pappi 5–7 mm. |
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2n | = 46. |
= 46. |
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Packera tampicana |
Packera bolanderi |
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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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CA; OR; WA
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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 2 (2 in the flora). The two varieties of Packera bolanderi have been treated as species. The morphologic characteristics used to distinguish the varieties vary widely within some populations. Presence or absence of multicellular hairs has been used to separate the varieties; that trait is also variable. The morphologic distinction is weak; habitat and elevation records lend support for recognizing two varieties. (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. 579. | ||||
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Senecio tampicanus, Senecio greggii, Senecio imparipinnatus | Senecio bolanderi | ||||
Name authority | (de Candolle) C. Jeffrey: Kew Bull. 47: 101. (1992) | (A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 45. (1981) | ||||
Web links |