Difference between revisions of "Helianthella uniflora"
Fl. N. Amer. 2: 334. 1842.
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| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
}} | }} | ||
|basionyms={{Treatment/ID/Basionym | |basionyms={{Treatment/ID/Basionym | ||
|name=Helianthus uniflorus | |name=Helianthus uniflorus | ||
|authority=Nuttall | |authority=Nuttall | ||
| + | |rank=species | ||
|publication_title=J. Acad. Nat. Sci. Philadelphia | |publication_title=J. Acad. Nat. Sci. Philadelphia | ||
|publication_place=7: 37. 1834 | |publication_place=7: 37. 1834 | ||
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|name=Helianthella uniflora var. douglasii | |name=Helianthella uniflora var. douglasii | ||
|authority=(Torrey & A. Gray) W. A. Weber | |authority=(Torrey & A. Gray) W. A. Weber | ||
| + | |rank=variety | ||
}} | }} | ||
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Ecliptinae;Helianthella;Helianthella uniflora | |hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Ecliptinae;Helianthella;Helianthella uniflora | ||
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name=Helianthella uniflora | name=Helianthella uniflora | ||
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|authority=(Nuttall) Torrey & A. Gray | |authority=(Nuttall) Torrey & A. Gray | ||
|rank=species | |rank=species | ||
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|publication title=Fl. N. Amer. | |publication title=Fl. N. Amer. | ||
|publication year=1842 | |publication year=1842 | ||
| − | |special status= | + | |special status=Endemic |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_280.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | ||
Latest revision as of 20:11, 5 November 2020
Plants 40–120 cm. Cauline leaves: largest at mid stems; blades usually 3-nerved, usually lanceolate to elliptic, rarely ovate, 12–25 cm, faces puberulent, hirsute, or scabrous. Heads usually borne singly, sometimes 2–3+, erect. Involucres turbinate to hemispheric or broader, 15–30 mm diam. Phyllaries lanceolate to lance-linear (subequal or outer larger, margins sometimes ciliate, faces ± cinereous-pubescent to sparsely puberulent). Paleae chartaceous, relatively firm. Ray florets 11–13(–21); laminae 15–30(–45) mm. Disc corollas yellow. Cypselae strongly compressed, narrowly obovate (margins ciliate, faces strigose); pappi of 2 ± subulate scales plus 2–4 shorter scales. 2n = 30.
Phenology: Flowering May–Jul(–Aug).
Habitat: Grasslands, meadows, sagebrush scrublands, swales, aspen forests, rocky slopes, and spruce-fir forests
Elevation: 300–3400 m
Distribution
B.C., Ariz., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.
Discussion
Two infraspecific taxa within Helianthella uniflora may be distinguished; they have been named at varietal rank.
Variety douglasii has stems hirsute; involucres (15–)20–25(–30) mm diam.; outer phyllaries rarely elongated, margins ciliate, abaxial faces sparsely puberulent; ray laminae 30–40 mm; and 2n = 30. It grows in grasslands in the northern Rocky Mountains and on the east side of the Cascade Range (B.C.; Idaho, Oreg., Wash.) at 300–2500 m where it flowers May–Jul.
Variety uniflora has stems sparingly puberulent to scabrous; involucres 15–20(–25) mm diam.; outer phyllaries frequently elongated, margins not ciliate, abaxial faces uniformly cinereous-pubescent; ray laminae 20–30 mm; and 2n = 30. It grows in meadows, sagebrush scrublands, swales, aspen forests, rocky slopes, and spruce-fir forests of the Rocky Mountains, intermountain plateaus, and Great Basin ranges (Ariz., Colo., Idaho, Mont., Nev., Oreg., Utah, Wyo.) at 1500–3400 m, where it flowers (May–)Jun–Jul(–Aug).
Selected References
None.