Difference between revisions of "Pyrrocoma uniflora"

(Hooker) Greene

Erythea 2: 60. 1894.

Common names: Plantain goldenweed
Endemic
Basionym: Donia uniflora Hooker Fl. Bor.-Amer. 2: 25, plate 124. 1834
Synonyms: Haplopappus uniflorus (Hooker) Torrey & A. Gray
Treatment appears in FNA Volume 20. Treatment on page 423. Mentioned on page 414, 416, 421.
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|discussion=<p>Varieties 2 (2 in the flora).</p><!--
 
|discussion=<p>Varieties 2 (2 in the flora).</p><!--
 
--><p><i>Pyrrocoma uniflora</i> is recognized by its somewhat reduced habit, tomentose leaves and phyllaries, heads borne singly or in small racemes, and sericeous cypselae. It is probably most closely related to <i>P. racemosa</i>.</p>
 
--><p><i>Pyrrocoma uniflora</i> is recognized by its somewhat reduced habit, tomentose leaves and phyllaries, heads borne singly or in small racemes, and sericeous cypselae. It is probably most closely related to <i>P. racemosa</i>.</p>
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|basionyms=Donia uniflora
 
|basionyms=Donia uniflora
 
|family=Asteraceae
 
|family=Asteraceae
|distribution=w North America.
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|distribution=Alta.;N.W.T.;Sask.;Calif.;Colo.;Idaho;Mont.;Nev.;Oreg.;Utah;Wyo.
 
|reference=None
 
|reference=None
 
|publication title=Erythea
 
|publication title=Erythea
 
|publication year=1894
 
|publication year=1894
|special status=
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|special status=Endemic
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|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V20_977.xml
 
|tribe=Asteraceae tribe Astereae
 
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|genus=Pyrrocoma
 
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Latest revision as of 18:24, 6 November 2020

Plants 7–40 cm. Stems 1–7, curved-ascending to decumbent, red-tinged, sparsely leafy to almost naked, glabrate to lanate or tomentulose, eglandular. Leaves: basal petiolate, blades linear to oblanceolate or elliptic, 40–150 × 3–20 mm, margins usually sharply dentate to laciniate, rarely entire; cauline sessile, few, blades lanceolate, 20–50 × 2–6 mm, bases cordate, clasping; faces glabrous, sparsely to densely shaggy-tomentose or lanate, eglandular. Heads usually borne singly, sometimes 2–4 in racemiform arrays. Peduncles 2–12 cm. Involucres hemispheric, 6–13 × 10–20 mm. Phyllaries in 2 series, appresssed or loose, linear-lanceolate, 6–11 mm, subequal or unequal (sometimes outer ± shorter and green throughout), margins ciliate, faces usually villous to lanate, rarely glabrous. Ray florets 18–50; corollas 7–11 mm. Disc florets 35–60; corollas 5–8 mm. Cypselae subcylindric, 2–4 mm, obscurely nerved and angled, faces sericeous; pappi tawny, 5–7 mm.

Distribution

V20-977-distribution-map.gif

Alta., N.W.T., Sask., Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wyo.

Discussion

Varieties 2 (2 in the flora).

Pyrrocoma uniflora is recognized by its somewhat reduced habit, tomentose leaves and phyllaries, heads borne singly or in small racemes, and sericeous cypselae. It is probably most closely related to P. racemosa.

Selected References

None.

Key

1 Stems and leaves tufted-tomentose; involucres 10–13 mm; phyllaries loosely appressed, unequal Pyrrocoma uniflora var. gossypina
1 Stems and leaves tomentose to glabrate or glabrous; involucres 6–9 mm; phyllaries appressed, subequal Pyrrocoma uniflora var. uniflora