Flora of North America species comparison

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Eucephalus vialis

Eucephalus tomentellus

wayside aster

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

erect, pilose to glandular-pubescent.

erect, woolly or cottony.
Leaves

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.

pubescent.
Involucres

turbinate, 8–10 mm.

turbinate, 7–10 mm.
Ray florets

0.

Phyllaries

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.
Heads

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

3–40 in racemiform to paniculiform arrays.
Cypselae

pilose;

pappus bristles in 2 series, smooth or ± barbellate.

glabrous or pilose;

pappus bristles in 2 series, ± barbellate.
Rays

(0–)1–3(–6), violet-purple.

Eucephalus vialis

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

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.)
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. tomentellus
E. breweri, E. elegans, E. engelmannii, E. glabratus, E. glaucescens, E. gormanii, E. ledophyllus, E. paucicapitatus, E. vialis
Synonyms Aster vialis Sericocarpus tomentellus, Aster brickellioides, Aster tomentellus, E. bicolor, E. brickellioides
Name authority Bradshaw: Torreya 20: 122. (1921) (Greene) Greene: Pittonia 3: 55. (1896)
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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