Flora of North America species comparison

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Eucephalus glabratus

Eucephalus breweri

Siskiyou aster, smooth aster

Brewer's aster
Habit Perennials, 30–60 cm (rhizomes branched). Perennials, 10–100 cm (caudices woody).
Stems

ascending to erect, glabrous or sparsely stipitate-glandular.

ascending to erect, glabrate or woolly, eglandular or glandular.
Leaves

mid and distal blades lanceolate to lance-ovate, 3–6 cm × 5–15 mm, ± glabrous.

mid and distal blades linear-lanceolate to ovate, 2–5 cm × 6–15 mm, faces glabrate and eglandular to moderately glandular and/or woolly.
Peduncles

glabrous or sparsely glandular.

sparsely to densely woolly and glandular.
Involucres

campanulate, 8–9 mm.

turbinate-cylindric, 6–10 mm.
Phyllaries

in 3–5 series (sometimes reddish apically), lanceolate to narrowly ovate (unequal), apices acute, abaxial glabrous or sparsely glandular.

in 3–4 series (sometimes reddish along margins), lance-linear to lance-oblong, ± subequal, margins eciliate, apices acuminate, abaxial faces glabrate and eglandular to moderately woolly or glandular.
Heads

3–8 in corymbiform arrays.

1–15(–35) in racemiform to corymbiform or paniculiform arrays.
Cypselae

appressed-pilose;

pappus bristles in 2 series, ± smooth.

strigose;

pappus bristles in 1 series (6–10 mm), barbellate.
Rays

0 or 1–2(–4), violet-purple.

0.
2n

= 18.

Eucephalus glabratus

Eucephalus breweri
Phenology Flowering Jul–Aug. Flowering Jul–Sep.
Habitat Dry open oak or coniferous forest or chaparral Open coniferous forest and subalpine meadows
Elevation 700–2300 m (2300–7500 ft) 1500–3000(–3500) m (4900–9800(–11500) ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
Discussion

Eucephalus glabratus is found in the Klamath Mountains of northwestern California and southwestern Oregon. The species is reported to intergrade with E. breweri, E. ledophyllus, and E. tomentellus.

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

Eucephalus breweri is found in the Sierra Nevada. Specimens at the northern edge of the range may intergrade with E. glabratus and E. tomentellus.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 41. FNA vol. 20, p. 40.
Parent taxa Asteraceae > tribe Astereae > Eucephalus Asteraceae > tribe Astereae > Eucephalus
Sibling taxa
E. breweri, E. elegans, E. engelmannii, E. glaucescens, E. gormanii, E. ledophyllus, E. paucicapitatus, E. tomentellus, E. vialis
E. elegans, E. engelmannii, E. glabratus, E. glaucescens, E. gormanii, E. ledophyllus, E. paucicapitatus, E. tomentellus, E. vialis
Synonyms Aster brickellioides var. glabratus, Aster siskiyouensis, E. glandulosus Chrysopsis breweri, Aster breweri, Heterotheca breweri
Name authority (Greene) Greene: Pittonia 3: 56. (1896) (A. Gray) G. L. Nesom: Phytologia 77: 254. (1995)
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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