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Olympic mountain-aster

wayside aster

brickellbush aster, hairy rayless aster, rayless aster

Habit Perennials 20–55 cm (caudices woody). Perennials, 60–120 cm (caudices stout). Perennials 40–90 cm (caudices woody).
Stems

ascending to erect, pilose or glandular-pubescent.

erect, pilose to glandular-pubescent.

erect, woolly or cottony.

Leaves

mid and distal blades elliptic to elliptic-oblong, 2–4 cm × 4–13 mm, sparsely scabrous to stipitate-glandular abaxially, moderately stipitate-glandular adaxially.

middle and distal cauline blades lanceolate-elliptic, 5–9 cm × 15–30 mm, abaxial faces usually glabrous, sometimes sparsely pubescent, adaxial faces glandular-pubescent.

mid and distal blades lanceolate to elliptic, 2.5–6 cm × 7–20 mm, abaxial faces glabrous or glabrate, adaxial ± densely woolly to cottony.

Peduncles

stipitate-glandular.

stipitate-glandular.

pubescent.

Heads

usually 2–4 in racemiform to corymbiform arrays, somtimes borne singly.

5–50(–120) in racemiform to paniculiform arrays.

3–40 in racemiform to paniculiform arrays.

Involucres

turbinate-obconic, 7–9 mm.

turbinate, 8–10 mm.

turbinate, 7–10 mm.

Ray florets

0.

Phyllaries

in 2–3 series (whitish), lance-linear (unequal), apices acute, abaxial faces stipitate-glandular.

in 3–6 series (sometimes reddish at margins and apices), linear to linear-oblong (strongly unequal), apices acute to acuminate, abaxial faces stipitate-glandular.

in 4–6 series (often reddish at margins and apices), linear-oblong to ovate (strongly unequal), apices acute, abaxial faces tomentose to stipitate-glandular.

Cypselae

obconic, pilose;

pappus bristles in 2 series, ± barbellate.

pilose;

pappus bristles in 2 series, smooth or ± barbellate.

glabrous or pilose;

pappus bristles in 2 series, ± barbellate.

Rays

7–13(–21), white.

(0–)1–3(–6), violet-purple.

Eucephalus paucicapitatus

Eucephalus vialis

Eucephalus tomentellus

Phenology Flowering Jul–Aug. Flowering Jul. Flowering Jul–Aug.
Habitat Open subalpine meadows or scree slopes Dry open oak or coniferous woods Open oak or coniferous woods, forest openings and rocky cliffs
Elevation 800–3300 m [2600–10800 ft] 200–500 m [700–1600 ft] 1300–2400 m [4300–7900 ft]
Discussion

Eucephalus paucicapitatus is found on Vancouver Island, where it is very uncommon, and the Olympic Peninsula. It is closely related to E. gormanii.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Of conservation concern.

Eucephalus vialis is only known from Lane and Douglas counties. It is considered threatened. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Eucephalus tomentellus grows in the Siskiyou Mountains of southwestern Oregon and northern California. It may intergrade with E. breweri and E. glabratus.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Distribution
from FNA
WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
OR
[BONAP county map]
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Parent taxa Asteraceae > tribe Astereae > Eucephalus Asteraceae > tribe Astereae > Eucephalus Asteraceae > tribe Astereae > Eucephalus
Sibling taxa
E. breweri, E. elegans, E. engelmannii, E. glabratus, E. glaucescens, E. gormanii, E. ledophyllus, E. tomentellus, E. vialis
E. breweri, E. elegans, E. engelmannii, E. glabratus, E. glaucescens, E. gormanii, E. ledophyllus, E. paucicapitatus, E. tomentellus
E. breweri, E. elegans, E. engelmannii, E. glabratus, E. glaucescens, E. gormanii, E. ledophyllus, E. paucicapitatus, E. vialis
Synonyms Aster engelmannii var. paucicapitatus, Aster paucicapitatus Aster vialis Sericocarpus tomentellus, Aster brickellioides, Aster tomentellus, E. bicolor, E. brickellioides
Name authority (B. L. Robinson) Greene: Pittonia 3: 56. (1896) Bradshaw: Torreya 20: 122. (1921) (Greene) Greene: Pittonia 3: 55. (1896)
Source Flora of North America vol. 20, p. 42. Flora of North America vol. 20, p. 42. Flora of North America vol. 20, p. 42.
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