Agoseris glauca var. dasycephala

(Torrey & A. Gray) Jepson

Man. Fl. Pl. Calif.,1005. 1925

Common names: Arctic agoseris
Synonyms: Agoseris altissima Agoseris aspera Agoseris eisenhoweri Agoseris glauca aspera Agoseris glauca aspera Agoseris glauca pumila Agoseris glauca scorzonerifolia Agoseris glauca villosa Agoseris isomeris Agoseris lanulosa Agoseris leontodon aspera Agoseris leontodon pygmaea Agoseris maculata Agoseris pubescens Agoseris pumila Agoseris scorzonerifolia Agoseris turbinata Agoseris vestita Agoseris villosa
Basionyms: Troximon glaucum dasycephalum
Found in FNA Volume 19. Treatment on page 326. Mentioned on page 327, 328, 329, 334.
FNA19 P33 Uropappus lindleyi.jpeg
Leaf blades: margins often undulate, usually entire, sometimes lobed, faces usually puberulent to densely villous, sometimes glabrous, rarely glaucous. Peduncles usually apically villous to lanate (glabrous in one phase), sometimes ± stipitate-glandular. Involucres obconic to hemispheric. Phyllaries often medially rosy purple and usually with some combination of purple-black spots, speckles, midstripes, or tips, rarely all green, margins ± undulate or reflexed, often hairy, faces usually villous to hirsuto-tomentose, sometimes glabrous, mostly stipitate-glandular; outer erect or spreading, usually adaxially villous, sometimes glabrous. Receptacles usually ± paleate. Cypselae usually glabrous, sometimes scabrous distally. 2n = 36.

Phenology: Flowering Jul–Aug.
Habitat: Moist to dry habitats, alpine meadows, montane forests, northern prairies, arctic tundra, in gravelly, rocky, and other coarse-textured soils
Elevation: 100–3600 m

Distribution

Alta., B.C., Man., N.W.T., Sask., Yukon, Colo., Idaho, Mont., N.Dak., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Variety dasycephala occurs primarily at high elevations in the western cordillera, extending eastward onto the northern prairies, and disjunctively in the Canadian arctic (Caribou Hills). It is more readily distinguished from var. glauca southward, where the two varieties are ± elevationally separated. Difficulty in separating them occurs northward, where they are nearer each other and pockets of complete introgression occur, e.g., southeastern British Columbia and southwestern Alberta. Hybrids with Agoseris aurantiaca and A. parviflora also occur.

Variety dasycephala contains regional phases that exhibit a step-clinal distribution. The large number of synonyms reflects the variation. As circumscribed here, var. dasycephala encompasses most of what has been called Agoseris glauca var. agrestis (see discussion under var. glauca).

References

None.

AuthorGary I. Baird +
BasionymTroximon glaucum dasycephalum +
Common nameArctic agoseris +
Elevation100–3600 m +
HabitatMoist to dry habitats, alpine meadows, montane forests, northern prairies, arctic tundra, in gravelly, rocky, and other coarse-textured soils +
IllustratorYevonn Wilson-Ramsey +
PhenologyFlowering Jul–Aug. +
ReferenceNone +
SynonymAgoseris altissima +, Agoseris aspera +, Agoseris eisenhoweri +, Agoseris glauca aspera +, Agoseris glauca pumila +, Agoseris glauca scorzonerifolia +, Agoseris glauca villosa +, Agoseris isomeris +, Agoseris lanulosa +, Agoseris leontodon aspera +, Agoseris leontodon pygmaea +, Agoseris maculata +, Agoseris pubescens +, Agoseris pumila +, Agoseris scorzonerifolia +, Agoseris turbinata +, Agoseris vestita + and Agoseris villosa +
Taxon nameAgoseris glauca var. dasycephala +
Taxon parentAgoseris glauca +
Taxon rankvariety +
VolumeVolume 19 +