Perennial 8–50 cm. Leaves linear to oblanceolate, 3–35 cm long, entire or with 1 to 3 pairs of shallow lobes. Herbage glabrous to sparsely villous. Involucre 1–2 cm long; phyllaries linear-lanceolate to lanceolate, in 2 to 3 indistinct series, green, glabrous to villous, sometimes glandular, often darkened along the midvein. Rays yellow; ligules 6–22 mm long. Pappus 8–18 mm long. Achene body 4–9 mm long; beak 0.5–3 mm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Our plants are variety
glauca or variety
dasycephala (Torr.& A.Gray) Jeps.
Agoseris species in Montana share the following characteristics:
*Solitary flowerhead composed only of ray (ligulate) flowers; each ray tipped with 5 lobes.
*Single, long flowering stem (peduncle) that has milky sap;
*Leaves are only basal; each leaf with a simple blade that tapering to the stem (petiole).
Pale Agoseris -
Agoseris glauca*Life Span: Perennial
*Flowers (Corollas): Yellow
*Leaf Blades: Entire or with shallow lobes that are less than half-way to the midvein.
Large-flower Agoseris -
Agoseris grandiflora*Life Span: Perennial
*Flowers (Corollas): Yellow
*Leaf Blades: Lobes divided half-way to the midvein.
*Involucral Bracts: Villous on the margins.
*Achene Beak: At least 8 mm long.
Steppe Agoseris -
Agoseris parviflora*Life Span: Perennial
*Flowers (Corollas): Yellow
*Leaf Blades: Lobes divided half-way to the midvein.
*Involucral Bracts: Glabrous or tomentose.
*Achene Beak: Less than 6 mm long.
Annual Agoseris -
Agoseris heterophylla*Life Span: Annual
* Flowers (Corollas): Yellow
*Leaf Blades: Not lobed; entire to slightly dentate.
Orange Agoseris -
Agoseris aurantiaca*Life Span: Perennial
*Flowers (Corollas): Orange to pink, often drying light purple
*Leaf Blades: Entire, dentate, or with shallow lobes.
POLLINATORSThe following animal species have been reported as pollinators of this plant species or genus where their geographic ranges overlap:
Bombus bifarius and
Bombus insularis (Wilson et al. 2010).
