Flora of North America species comparison

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Eucephalus glabratus

Eucephalus ledophyllus

Siskiyou aster, smooth aster

Cascade aster
Habit Perennials, 30–60 cm (rhizomes branched). Perennials, 20–80 cm (caudices stout).
Stems

ascending to erect, glabrous or sparsely stipitate-glandular.

erect, pilose to stipitate-glandular.
Leaves

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

mid and distal blades lance-elliptic to oblong, 2.5–7 cm × 5–20 mm, glabrous or sparsely pubescent abaxially, ± densely cottony and sometimes stipitate-glandular adaxially.
Peduncles

glabrous or sparsely glandular.

pilose to stipitate-glandular.
Involucres

campanulate, 8–9 mm.

turbinate, 7–11 mm.
Phyllaries

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

in 3–5 series (usually reddish at margins and apices), lanceolate (strongly unequal), apices acute to acuminate, abaxial faces puberulent to stipitate-glandular.
Heads

3–8 in corymbiform arrays.

3–20 in racemiform to corymbiform arrays.
Cypselae

appressed-pilose;

pappus bristles in 2 series, ± smooth.

pilose;

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

0 or 1–2(–4), violet-purple.

5–21, purple.
2n

= 18.

Eucephalus glabratus

Eucephalus ledophyllus
Phenology Flowering Jul–Aug.
Habitat Dry open oak or coniferous forest or chaparral
Elevation 700–2300 m (2300–7500 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR; WA
[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 ledophyllus may intergrade with e. engelmannii in the northern part of its range

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Peduncles glandular or not, at least ± woolly or cottony; rays usually 13 or 21
var. ledophyllus
1. Peduncles glandular, not cottony; rays usually 5 or 8
var. covillei
Source FNA vol. 20, p. 41. FNA vol. 20, p. 41.
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. breweri, E. elegans, E. engelmannii, E. glabratus, E. glaucescens, E. gormanii, E. paucicapitatus, E. tomentellus, E. vialis
Subordinate taxa
E. ledophyllus var. covillei, E. ledophyllus var. ledophyllus
Synonyms Aster brickellioides var. glabratus, Aster siskiyouensis, E. glandulosus Aster engelmannii var. ledophyllus, Aster ledophyllus
Name authority (Greene) Greene: Pittonia 3: 56. (1896) (A. Gray) 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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