OregonFlora: Symphyotrichum ontarionis vs. Symphyotrichum campestre

	Symphyotrichum ontarionis	Symphyotrichum campestre
		western meadow aster
Habit		Plants perennial, 1–4 dm; from elongate rhizomes.
Stems		ascending to erect, generally strigose, glandular.
Leaves		linear to narrowly oblanceolate, 2–6 cm; margins entire; tips obtuse to acute, mucronate to minutely spinulose; surfaces glabrous to stipitate-glandular; basal withering by flowering, sessile.
Inflorescences		narrow to spreading panicle-like arrays.
Involucres		5–8 mm, glandular.
Ray florets		15–30; rays 6–15 mm, violet.
Phyllaries		in 3–4 subequal to unequal series, spreading to reflexed, linear to lanceolate, bases scarious-margined; tips acute, green; surfaces stipitate-glandular.
Fruits		pubescent; pappus bristles 4–6 mm; brownish.
Heads		1–10(30); peduncles glandular.
2n		=10.

	Symphyotrichum ontarionis	Symphyotrichum campestre
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion		Meadows, open dry coniferous forests, disturbed areas. Flowering Jul–Sep. 200–1900 m. BR, BW, Col, ECas, Lava, Owy. CA, ID, NV, WA; north to British Columbia, northeast to Alberta, east to WY, southeast to NM, south to Mexico. Native.
Source		Flora of Oregon, volume 2, page 356 Geraldine Allen
Sibling taxa	S. ascendens, S. bracteolatum, S. campestre, S. chilense, S. ciliatum, S. cusickii, S. cusickii x Symphyotrichum spathulatum, S. ericoides, S. foliaceum, S. frondosum, S. hallii, S. hendersonii, S. laeve, S. lanceolatum, S. novae-angliae, S. spathulatum, S. subspicatum	S. ascendens, S. bracteolatum, S. chilense, S. ciliatum, S. cusickii, S. cusickii x Symphyotrichum spathulatum, S. ericoides, S. foliaceum, S. frondosum, S. hallii, S. hendersonii, S. laeve, S. lanceolatum, S. novae-angliae, S. spathulatum, S. subspicatum
Synonyms		Aster campestris, Aster campestris var. bloomeri, Aster campestris var. campestris
Web links	Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Symphyotrichum ontarionis

Symphyotrichum campestre

western meadow aster

Habit

Plants perennial, 1–4 dm; from elongate rhizomes.

Stems

ascending to erect, generally strigose, glandular.

Leaves

linear to narrowly oblanceolate, 2–6 cm;

margins entire;

tips obtuse to acute, mucronate to minutely spinulose;

surfaces glabrous to stipitate-glandular;

basal withering by flowering, sessile.

Inflorescences

narrow to spreading panicle-like arrays.

Involucres

5–8 mm, glandular.

Ray florets

15–30;

rays 6–15 mm, violet.

Phyllaries

in 3–4 subequal to unequal series, spreading to reflexed, linear to lanceolate, bases scarious-margined;

tips acute, green;

surfaces stipitate-glandular.

Fruits

pubescent;

pappus bristles 4–6 mm; brownish.

Heads

1–10(30);

peduncles glandular.

=10.

Symphyotrichum ontarionis

Symphyotrichum campestre

Distribution

[WildflowerSearch map]

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Meadows, open dry coniferous forests, disturbed areas. Flowering Jul–Sep. 200–1900 m. BR, BW, Col, ECas, Lava, Owy. CA, ID, NV, WA; north to British Columbia, northeast to Alberta, east to WY, southeast to NM, south to Mexico. Native.

Source

Flora of Oregon, volume 2, page 356
Geraldine Allen

Sibling taxa