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Helianthella uniflora (Nutt. ) Torr. & A. Gray
ONEFLOWER HELIANTHELLA
Life   Plantae   Dicotyledoneae   Asteraceae   Helianthella


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FamilyScientific name @ source (records)
Apidae  Bombus mixtus @ BBSL (1)

Bombus rufocinctus @ I_JSA (1)

Ceratina pacifica @ BBSL (1)
Dermateaceae  Marssonina wyethiae @ 869115B (1)
Halictidae  Halictus ligatus @ BBSL (1)

Halictus tripartitus @ BBSL (1)
Mycosphaerellaceae  Cercosporella helianthellae @ 869115A (1); 420680A (1); 420680B (1)

Ramularia cynarae @ BPI (3)
Pleosporaceae  Pleospora ellisiana @ 627552B (1); 627552A (1)
Pucciniaceae  Puccinia grindeliae @ BPI (1)

Puccinia helianthellae @ BPI (9)

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Following modified from Plants Database, United States Department of Agriculture
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Following modified from Flora of North America
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FNA | Family List | FNA Vol. 21 | Asteraceae | Helianthella

4. Helianthella uniflora (Nuttall) Torrey & A. Gray, Fl. N. Amer. 2: 334. 1842.

Helianthus uniflorus Nuttall, J. Acad. Nat. Sci. Philadelphia 7: 37. 1834; Helianthella uniflora var. douglasii (Torrey & A. Gray) W. A. Weber

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.

Flowering May—Jul(—Aug). Grasslands, meadows, sagebrush scrublands, swales, aspen forests, rocky slopes, and spruce-fir forests; 300—3400 m; B.C.; Ariz., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

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 2 n = 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 2 n = 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).

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Updated: 2017-11-25 09:58:40 gmt
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