Packera eurycephala |
Packera plattensis |
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cut-leaf butterweed, wide-head groundsel |
plains butterweed, prairie groundsel |
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Habit | Perennials, 20–50+ cm, taprooted (caudices branched, ascending to erect, woody). | Biennials or perennials, 20–60+ cm; rhizomatous and/or fibrous-rooted (bases erect to suberect), sometimes stoloniferous (mostly eastern populations). | ||||
Stems | 1 or, usually, multiple, clustered, densely tomentose to glabrescent. |
1 or 2–3, clustered, floccose-tomentose proximally and in leaf axils, otherwise sparsely tomentose or glabrescent. |
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Basal leaves | (soon withering), petiolate; blades lyrate (lateral lobes 2–6+ pairs), ovate, obovate, or spatulate, 70–100+ × 20–30+ mm, bases tapering, ultimate margins irregularly and coarsely serrate-dentate. |
(and proximal cauline) petiolate; blades narrowly elliptic to elliptic-ovate or oblanceolate to suborbiculate or sublyrate, 20–70+ × 10–30+ mm, bases tapering to rounded or abruptly contracted, margins subentire to crenate, serrate-dentate, or pinnately lobed (abaxial faces floccose-tomentose, especially along midribs, ± glabrescent). |
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Cauline leaves | gradually reduced (± petiolate, proximal and mid similar to basal, terminal lobes smaller than laterals; distal sessile, incised). |
gradually reduced (petiolate, sublyrate or pinnatisect, abaxial faces sparsely hairy; distals sessile, subentire to irregularly dissected). |
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Peduncles | bracteate, sparsely to densely lanate-tomentose. |
conspicuously bracteate, sparsely to densely tomentose. |
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Ray florets | 8 or 13; corolla laminae 10–15 mm. |
8–10; corolla laminae 9–10 mm. |
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Disc florets | 35–50+; corolla tubes 3.5–4.5 mm, limbs 2.5–3.5 mm. |
60–70+; corolla tubes 2.5–3.5 mm, limbs 3.5–4.5 mm. |
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Phyllaries | 13 or 21, green (tips sometimes yellow), 8–10+ mm, densely tomentose proximally, glabrescent distally. |
13 or 21, green (tips sometimes cyanic), 5–6+ mm, densely tomentose proximally, glabrescent distally. |
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Calyculi | inconspicuous (bractlets tomentose). |
inconspicuous. |
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Heads | 5–20+ in open or compact (rarely), cymiform arrays. |
6–20+ in open or congested, corymbiform arrays. |
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Cypselae | 1–1.5 mm, glabrous; pappi 6–7 mm. |
1.5–2.5 mm, usually hirtellous, sometimes glabrous; pappi 6.5–7.5 mm. |
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2n | = 46. |
= 46, 92. |
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Packera eurycephala |
Packera plattensis |
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Phenology | Flowering mid Apr–early Jun(–mid Jul, north). | |||||
Habitat | Prairies, meadows, open wooded areas, along highways, railroads, around mining and construction areas, usually on limestone | |||||
Elevation | 50–1800 m (200–5900 ft) | |||||
Distribution |
CA; OR
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AR; CO; GA; IA; IL; IN; KS; LA; MI; MN; MO; MS; MT; ND; NE; NM; OH; OK; PA; SD; TN; VA; WI; WY; ON; SK
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera plattensis is abundant, widespread, and almost weedy. Putative hybrids with other species are known. Plants in mesic, remnant prairies in the east are sometimes stoloniferous. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 586. | FNA vol. 20, p. 596. | ||||
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Senecio eurycephalus | Senecio plattensis, Senecio pseudotomentosus | ||||
Name authority | (Torrey & A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) | (Nuttall) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | ||||
Web links |