Agoseris parviflora

(Nuttall) D. Dietrich

Syn. Pl. 4: 1332. 1847.

Common names: Steppe agoseris
Basionym: Troximon parviflorum Nuttall Trans. Amer. Philos. Soc., n. s. 7: 434. 1841
Synonyms: Agoseris caudata Greene Agoseris dens-leonis Greene Agoseris glauca var. laciniata (D. C. Eaton) Kuntze Agoseris leptocarpa Osterhout Agoseris rosea (Nuttall) D. Dietrich Agoseris taraxacoides Greene Agoseris tomentosa Howell
Treatment appears in FNA Volume 19. Treatment on page 328. Mentioned on page 324, 325, 326, 327, 329, 331.

Stems 0. Leaves erect to decumbent; petioles sometimes purplish, margins usually ± hairy, sometimes glabrous or ciliate; blades linear-lanceolate to oblanceolate, (5–)10–20(–32) cm, margins usually lobed, sometimes entire (variable within plants, e.g., outer entire, inner lobed), rarely all entire; lobes (3–)5–8 pairs, linear to lanceolate, mostly retrorse, sometimes spreading; lobules often present, faces glabrous and glaucous or densely tomentose. Peduncles not notably elongating after flowering, [(6–)10–25(–45) cm in fruit], glabrate, or apically hairy to lanate, eglandular. Involucres obconic to hemispheric, 2–3.5 cm in fruit. Phyllaries in 2–3 series, usually medially rosy purple, rarely all green or spotted, margins ciliate or lanate, faces glabrous or sparsely villous, eglandular; outer erect or spreading, adaxially ± tomentose (sometimes glabrous); inner erect, not notably elongating after flowering. Receptacles epaleate. Florets 30–100; corollas yellow, tubes (4–)6–15 mm, ligules 10–20 × 2–4 mm; anthers 3–5 mm. Cypselae 9–18 mm, bodies terete or narrowly conic to obconic, 5–9 mm, beaks 3–10 mm, lengths (1/2–)2 times bodies; pappus bristles in ca. 3 series, 10–20 mm. 2n = 18.

Phenology: Flowering Apr–Aug.
Habitat: Dry habitats, sandy soils, short-grass prairies, sagebrush steppes, pinyon-juniper woodlands, montane meadows, mixed conifer forests
Elevation: 1000–3400 m



Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., S.Dak., Utah, Wyo.


Agoseris parviflora is found in drier habitats from western Great Plains to eastern foothills of the Cascade Mountains and Sierra Nevada. This is A. glauca var. laciniata of recent authors. The inclusion of A. parviflora within an expanded A. glauca is based partly on the mistaken perception that those two species readily intergrade and that A. parviflora is a xeric variant of the more mesic A. glauca. Although hybrids between the two species occur, frequency of intermediates is no greater than that of any other species in the genus. Agoseris parviflora is known to form intermediates with A. aurantiaca, A. monticola, and A. retrorsa as well. This species exhibits some regional variations. In their extremes, these phases appear more or less distinct but they so completely intergrade that their separation becomes arbitrary.

Selected References


Lower Taxa

... more about "Agoseris parviflora"
Gary I. Baird +
(Nuttall) D. Dietrich +
Troximon parviflorum +
Steppe agoseris +
Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, S.Dak. +, Utah +  and Wyo. +
1000–3400 m +
Dry habitats, sandy soils, short-grass prairies, sagebrush steppes, pinyon-juniper woodlands, montane meadows, mixed conifer forests +
Flowering Apr–Aug. +
Agoseris caudata +, Agoseris dens-leonis +, Agoseris glauca var. laciniata +, Agoseris leptocarpa +, Agoseris rosea +, Agoseris taraxacoides +  and Agoseris tomentosa +
Agoseris parviflora +
Agoseris +
species +