Difference between revisions of "Hymenoxys richardsonii"

(Hooker) Cockerell

Bull. Torrey Bot. Club 31: 468. 1904.

Common names: Richardson’s bitterweed pingue rubberweed
Endemic
Basionym: Picradenia richardsonii Hooker Fl. Bor.-Amer. 1: 317, plate 108. 1833 (as richardsoni)
Treatment appears in FNA Volume 21. Treatment on page 440. Mentioned on page 435, 436.
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|common_names=Richardson’s bitterweed;pingue rubberweed
 
|common_names=Richardson’s bitterweed;pingue rubberweed
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|name=Picradenia richardsonii
 
|name=Picradenia richardsonii
 
|authority=Hooker
 
|authority=Hooker
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|rank=species
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|publication_title=Fl. Bor.-Amer.
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|publication_place=1: 317, plate 108. 1833 (as richardsoni)
 
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|distribution=w North America.
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|distribution=Alta.;Sask.;Ariz.;Colo.;Mont.;N.Dak.;N.Mex.;Tex.;Utah;Wyo.
 
|discussion=<p>Varieties 2 (2 in the flora).</p>
 
|discussion=<p>Varieties 2 (2 in the flora).</p>
 
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name=Hymenoxys richardsonii
 
name=Hymenoxys richardsonii
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|authority=(Hooker) Cockerell
 
|authority=(Hooker) Cockerell
 
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|rank=species
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|basionyms=Picradenia richardsonii
 
|basionyms=Picradenia richardsonii
 
|family=Asteraceae
 
|family=Asteraceae
|distribution=w North America.
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|distribution=Alta.;Sask.;Ariz.;Colo.;Mont.;N.Dak.;N.Mex.;Tex.;Utah;Wyo.
 
|reference=None
 
|reference=None
 
|publication title=Bull. Torrey Bot. Club
 
|publication title=Bull. Torrey Bot. Club
 
|publication year=1904
 
|publication year=1904
|special status=
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|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V21_1102.xml
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|tribe=Asteraceae tribe Heliantheae
 
|tribe=Asteraceae tribe Heliantheae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae
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Latest revision as of 18:19, 6 November 2020

Perennials, 7–34 cm (polycarpic; usually with highly branched woody caudices). Stems 1–20(–30+), usually green throughout, rarely purple-red-tinted proximally, branched distally, glabrous or ± hairy. Leaves: blades simple or lobed (lobes 3–7), glabrous or ± hairy, gland-dotted (basal leaf bases densely long-villous-woolly); mid leaves lobed (lobes 3–5, terminal lobes 0.7–2 mm wide). Heads 5–300+ per plant, in corymbiform arrays. Peduncles 1–5 cm, ± hairy. Involucres campanulate, 7–11 × 7–14 mm. Phyllaries in 2 series, unequal; outer 8–13, obovate to ovate to lanceolate, basally connate 1/2 their lengths, 3.5–8 mm, apices acuminate to acute; inner 8–18, obovate, 3–8 mm, apices mucronate. Ray florets 7–14; corollas yellow, 7–17 × 3–6 mm. Disc florets 25–75+; corollas 3–5 mm. Cypselae narrowly obpyramidal, 2–3 mm; pappi of 4–8 obovate to lanceolate, aristate scales 1.8–3.5 mm. 2n = 30.

Distribution

V21-1102-distribution-map.gif

Alta., Sask., Ariz., Colo., Mont., N.Dak., N.Mex., Tex., Utah, Wyo.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Stems 1–10; leaves ± hairy; heads 5–35+ per plant; involucres 8–11 × 9–14 mm; outer phyllaries 9–13, weakly to moderately keeled; ray corollas 11–17 mm Hymenoxys richardsonii var. richardsonii
1 Stems (2–)5–20(–30+); leaves glabrous or sparsely hairy; heads (30–)80–250(–300+) per plant; involucres 7–8 × 7–9 mm; outer phyllaries 8–9, strongly keeled; ray corollas 7–11 mm Hymenoxys richardsonii var. floribunda