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43. Packera pseudaurea (Rydberg) W. A. Weber & Á. Löve, Phytologia. 49: 48. 1981.
False-gold groundsel
Senecio pseudaureus Rydberg, Bull. Torrey Bot. Club 24: 298. 1897
Perennials, 20–70+ cm; fibrous-rooted (bases simple or branched, horizontal to erect). Stems usually 1, sometimes 2–4, clustered, glabrous or sparsely tomentose proximally. Basal leaves petiolate; blades usually broadly lanceolate to ovate, sometimes subhastate, 20–50+ × 20–40+ mm, bases truncate to subcordate or obtuse, margins crenate, denticulate, bluntly dentate, or sharply dentate (proximal cauline leaves petiolate; margins usually pinnately lobed to laciniate, sometimes subentire). Cauline leaves gradually reduced (becoming sessile, sometimes clasping). Heads 5–20+ in open or congested, subumbelliform arrays. Peduncles bracteate, glabrous. Calyculi inconspicuous. Phyllaries (13–)21(–30+), light green, 3–8 mm, glabrous. Ray florets 0, 8, or 13; corolla laminae 6–10+ mm. Disc florets 70–80+; corolla tubes 2.5–3.5 mm, limbs 2–3 mm. Cypselae 1–1.5 mm, glabrous; pappi 4.5–5.5 mm. 2n = 40, 44, 46, 80.
Varieties 3 (3 in the flora): w, c North America.
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| 1 |
Basal leaves: margins sharply dentate; phyllaries 7–8 mm |
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43b Packera pseudaurea var. pseudaurea |
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Basal leaves: margins usually crenate, denticulate, or bluntly dentate, rarely sharply dentate; phyllaries 3–6 mm |
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(2) |
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| 2 (1) |
Basal leaves: petiole lengths equaling blades, blades broadly ovate, margins usually bluntly dentate or denticulate, rarely sharply dentate; heads 5–12 in congested, cymiform arrays; phyllaries 3–5 mm; s Rocky Mountains |
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43a Packera pseudaurea var. flavula |
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Basal leaves: petiole lengths 1.5–2 times blades, blades narrowly ovate, margins crenate; heads 6–12 in open or slightly congested, corymbiform or cymiform arrays; phyllaries 4–6 mm; Great Plains |
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43c Packera pseudaurea var. semicordata |
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