Eucephalus
Eucephalus vialis
aster
wayside aster
ascending or erect, simple, glabrate, puberulent, pilose, cottony, or woolly, eglandular or glandular.
erect, pilose to glandular-pubescent.
cauline; alternate;
sessile (proximal withering by flowering; proximalmost reduced, scalelike);
blades (1-nerved) ovate, elliptic, oblong, lanceolate, or linear (± uniform in size), margins entire, faces glabrate, scabrous, cottony, or woolly, eglandular or stipitate-glandular.
middle and distal cauline blades lanceolate-elliptic, 5–9 cm × 15–30 mm, abaxial faces usually glabrous, sometimes sparsely pubescent, adaxial faces glandular-pubescent.
stipitate-glandular.
turbinate-cylindric, turbinate, turbinate-obconic, or campanulate, 10–25 mm diam.
turbinate, 8–10 mm.
± flat, pitted, epaleate.
0–21 (usually 5, 8, or 13), pistillate, fertile;
corollas violet-purple, purple, pink, or white.
0.
10–35, bisexual, fertile;
corollas yellow, ± ampliate, tubes shorter than funnelform throats, lobes 5, erect or reflexed, triangular;
style-branch appendages lanceolate.
20–50 in 3–6 series, ± unequal (± appressed, often reddish or purplish at margins and tips), 1-nerved (keeled), ovate, lance-oblong, lanceolate, linear-oblong, or linear, chartaceous at bases, margins sometimes hyaline, especially proximally;
apices acute to obtuse, green, usually puberulent, tomentose, and/or stipitate-glandular, sometimes glabrous.
in 3–6 series (sometimes reddish at margins and apices), linear to linear-oblong (strongly unequal), apices acute to acuminate, abaxial faces stipitate-glandular.
radiate or discoid, usually in open, racemiform, paniculiform, or corymbiform arrays, sometimes borne singly.
5–50(–120) in racemiform to paniculiform arrays.
± obconic, flattened, laterally 1–2-ribbed, sometimes with 1–2 additional nerves on each face, glabrous, pilose, or strigose, eglandular;
pappi persistent, of 30–50 whitish to tawny, barbellate or smooth, apically clavate or more conspicuously barbellate bristles in 2(–3) series (outer usually 1 mm or less, sometimes 0, inner 5–10 mm).
pilose;
pappus bristles in 2 series, smooth or ± barbellate.
= 9.
Eucephalus
Eucephalus vialis
Species 10 (10 in the flora).
Eucephalus, a relatively well-marked western North American group, has been treated as a section of Aster or as a distinct genus. Recent molecular evidence places Eucephalus, together with the eastern North American Doellingeria, at the base of the North American clade of Astereae.
(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.)
1. Ray florets usually 1–4, often 0 | → 2 |
1. Ray florets commonly 5, 8, or 13+ | → 5 |
2. Ray florets 0; leaves 5–9 cm, ± glabrous abaxially, glandular adaxially; plants 60–120 cm; open woods, Lane County, Oregon | E. vialis |
2. Ray florets usually 1–4; leaves 2–6 cm, hairy; plants 10–100 cm | → 3 |
3. Leaves glabrous or nearly so abaxially, moderately to densely hairy adaxially | E. tomentellus |
3. Leaves glabrous, eglandular or sparsely glandular on both faces | → 4 |
4. Phyllaries subequal | E. breweri |
4. Phyllaries strongly unequal | E. glabratus |
5. Stems, leaves, and phyllaries glabrous, glaucous; plants 40–160 cm; leaves linear tonarrowly lance-elliptic, 4–10 cm; rays purple | E. glaucescens |
5. Stems, leaves, and phyllaries pubescent or glabrate, glandular or not, not glaucous; plants 10–120(–150) cm; leaves elliptic, oblong, lance-ovate, lance-elliptic, lanceolate, linear-oblong or -lanceolate, 1.5–10 cm; rays white, pink, violet, or purple. | → 6 |
6. Leaves 5–10 cm, elliptic to lanceolate, glabrous and eglandular, or abaxially ± glandular and/or villous; plants 50–150 cm; rays white to pink | E. engelmannii |
6. Leaves 1.5–7 cm, elliptic, elliptic-oblong, oblong, lance-ovate, lance-elliptic, linear-oblong or -lanceolate, glandular or not, scabrous or cottony; plants 10–80 cm; rays white or violet to purple | → 7 |
7. Rays white; stems pilose or sparsely to moderately glandular-pubescent | → 8 |
7. Rays violet to purple; stems scabrous (to scabrellous) or cottony and/or glandular-pubescent (especially peduncles) | → 9 |
8. Phyllaries lance-ovate; Cascade Mountains, Oregon | E. gormanii |
8. Phyllaries lance-linear; Olympic Mountains, Washington | E. paucicapitatus |
9. Leaves moderately scabrellous (and sometimes glandular) on both faces | E. elegans |
9. Leaves sparsely scabrous abaxially, strongly cottony adaxially | E. ledophyllus |
OR
WA
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
