Flora of North America species comparison

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Eucephalus tomentellus

Eucephalus vialis

brickellbush aster, hairy rayless aster, rayless aster

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

erect, woolly or cottony.

erect, pilose to glandular-pubescent.
Leaves

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

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

pubescent.

stipitate-glandular.
Involucres

turbinate, 7–10 mm.

turbinate, 8–10 mm.
Ray florets

0.
Phyllaries

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

3–40 in racemiform to paniculiform arrays.

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

glabrous or pilose;

pappus bristles in 2 series, ± barbellate.

pilose;

pappus bristles in 2 series, smooth or ± barbellate.
Rays

(0–)1–3(–6), violet-purple.

Eucephalus tomentellus

Eucephalus vialis
Phenology Flowering Jul–Aug. Flowering Jul.
Habitat Open oak or coniferous woods, forest openings and rocky cliffs Dry open oak or coniferous woods
Elevation 1300–2400 m (4300–7900 ft) 200–500 m (700–1600 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
OR
[BONAP county map]
Discussion

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.)

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.)
Source FNA vol. 20, p. 42. FNA vol. 20, p. 42.
Parent taxa 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. paucicapitatus, E. vialis
E. breweri, E. elegans, E. engelmannii, E. glabratus, E. glaucescens, E. gormanii, E. ledophyllus, E. paucicapitatus, E. tomentellus
Synonyms Sericocarpus tomentellus, Aster brickellioides, Aster tomentellus, E. bicolor, E. brickellioides Aster vialis
Name authority (Greene) Greene: Pittonia 3: 55. (1896) Bradshaw: Torreya 20: 122. (1921)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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