Hymenoxys richardsonii (Hooker) Cockerell (Q2709)
Hymenoxys richardsonii is a taxon with the rank species within the subgenus Hymenoxys subg. Picradenia
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Hymenoxys richardsonii (Hooker) Cockerell
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Hymenoxys richardsonii is a taxon with the rank species within the subgenus Hymenoxys subg. Picradenia
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Statements
taxon/id/Hymenoxys richardsonii (Hooker) Cockerell
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Hymenoxys richardsonii (Hooker) Cockerell
Hymenoxys richardsonii
(Hooker) Cockerell
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 21: Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford University Press, New York.
accepted
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CA-AB
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CA-SK
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US-AZ
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US-CO
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US-MT
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US-ND
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US-NM
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US-TX
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US-UT
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US-WY
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Stems 1–20 (–30+), usually green throughout, rarely purple-red-tinted proximally, branched distally, glabrous or ± hairy.
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Leaves: blades simple or lobed (lobes 3–7), glabrous or ± hairy, glanddotted (basal leaf-bases densely long-villous-woolly);
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mid leaves lobed (lobes 3–5, terminal lobes 0.7–2 mm wide).
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Heads 5–300+ per plant, in corymbiform arrays.
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Peduncles 1–5 cm, ± hairy.
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Involucres campanulate, 7–11 × 7–14 mm.
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Phyllaries in 2 series, unequal;
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outer 8–13, obovate to ovate to lanceolate, basally connate 1/2 their lengths, 3.5–8 mm, apices acuminate to acute;
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inner 8–18, obovate, 3–8 mm, apices mucronate.
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Ray-florets 7–14;
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corollas yellow, 7–17 × 3–6 mm.
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Disc-florets 25–75+;
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Cypselae narrowly obpyramidal, 2–3 mm;
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pappi of 4–8 obovate to lanceolate, aristate scales 1.8–3.5 mm. 2n = 30.
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purple-red-tinted
rarely; proximally
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