Symphyotrichum ontarionis |
Symphyotrichum campestre |
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aster du lac Ontario, bottomland aster, Ontario American-aster, Ontario aster |
meadow aster, western meadow aster |
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Habit | Perennials, 20–120 cm, colonial; long-rhizomatous. | Perennials, 10–40 cm, colonial or cespitose; long-rhizomatous. | ||||
Stems | 1–(2–3), ascending to erect (straight), proximally glabrate, distally uniformly villous or hirsute, or glabrous (var. glabratum). |
1–5+, ascending to erect (light to dark brown), proximally glabrous, distally strigose, stipitate-glandular. |
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Leaves | thin, margins scabrous, apices mucronate, abaxial faces usually sparsely to densely strigose or strigillose, sometimes glabrous (var. glabrum), adaxial usually strigose or scabrous, sometimes glabrate or glabrous (var. glabrum); basal withering by flowering, petiolate to subpetiolate (petioles narrowly winged, ciliate, bases sheathing), blades spatulate to oblanceolate-obovate, 10–40 × 5–10 mm, bases attenuate, margins crenate-serrate, apices acute to rounded; proximalmost cauline usually withering by flowering, petiolate or sessile (petioles narrowly winged, ± clasping), blades ovate or lance-ovate to elliptic-lanceolate or oblanceolate, 20–80(–12) × 5–35 mm, progressively reduced distally, bases attenuate to cuneate, margins serrate (sometimes coarsely) to crenate-serrate, apices acute to acuminate or short-caudate; distal sessile, blades elliptic-lanceolate to oblanceolate or lanceolate, (6–)10–80+ × 2–25 mm, progressively reduced distally, bases cuneate, margins entire to serrulate, apices acute to acuminate. |
(light green) firm, margins entire, scabrous; basal sometimes persistent, sessile, blades (1–3-nerved) linear-oblanceolate, 10–30 × 4–10 mm, bases attenuate, apices obtuse, mucronate, faces glabrate to sparsely scabrous; proximal cauline withering by flowering, sessile, blades (3-nerved) narrowly oblanceolate, 20–80 × 2–8 mm, bases cuneate, apices obtuse to acute, mucronulate or white-spinulose, faces glabrous or moderately short-strigose, stipitate-glandular; distal sessile, blades linear-oblanceolate to -lanceolate or oblong (distally), 20–50 × 2–5 mm, ± reduced distally, bases ± clasping to cuneate, apices acute, mucronulate, faces glabrous or moderately short-strigose, stipitate-glandular. |
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Peduncles | subsessile or 2–10(–20) mm, ± pilose, bracts 1–5, linear-lanceolate, pilose, grading into phyllaries. |
sparsely to moderately short-strigose, moderately stipitate-glandular, bracts ± ascending, linear to narrowly-lanceolate. |
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Involucres | campanulate, 3–5.5 mm. |
campanulate to cylindro-campanulate, 5.5–8 mm. |
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Ray florets | (10–)15–26; corollas usually white, rarely pinkish or light purple to blue, laminae 3.5–5.5(–8) × 0.5–1.5 mm. |
15–31; corollas violet, laminae (5–)6–15 × 1–2 mm. |
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Disc florets | 12–25; corollas cream or light yellow turning magenta or purple (ampliate), 2.5–4(–4.5) mm, tubes shorter than funnelform throats, lobes slightly spreading to reflexed, lanceolate, 0.7–1.1 mm. |
25–40; corollas yellow, 4.5–6 mm, lobes triangular, 0.4–0.8 mm. |
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Phyllaries | in (3–)4–6 series, unequal, appressed or ± spreading, linear-obovate (outer) to oblong-lanceolate to linear (inner), bases indurate 1/3–3/4, margins narrowly scarious to apices, erose, hyaline, ciliate, green zones lanceolate, apices acute to acuminate, mucronulate, faces (outer) sparsely pilose or glabrous (var. glabratum), (inner) glabrous. |
in 3–4 series, linear to lanceolate, subequal to unequal, bases ± indurate, margins scarious, green zones covering distal portion, apices acute to acuminate, outer ± foliaceous, spreading to reflexed, faces glabrate, sparsely to densely stipitate-glandular. |
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Heads | in ample, open, paniculiform arrays, branches ± ascending or divaricate to long-arching, ± secund. |
1–10(–30), borne singly or in paniculiform arrays, branches ascending. |
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Cypselae | gray or tan, oblong-obovoid, sometimes ± compressed, 1.2–1.8(–2) mm, 3–5-nerved, faces strigillose; pappi whitish to white, 3–3.5 mm. |
light brown, sometimes translucent reddish brown between ribs, narrowly obovoid, ± compressed, 2–2.5 mm, 3–4-nerved (faint), moderately strigose on ribs; pappi tawny, 3.8–6 mm. |
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2n | = 10. |
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Symphyotrichum ontarionis |
Symphyotrichum campestre |
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Phenology | Flowering Aug–Oct. | |||||
Habitat | Open, often dry, disturbed, rocky and sandy soils near ponds and streams, dry grass meadows, open pine-douglas fir forests, plains to montane zones | |||||
Elevation | 1500–2500 m (4900–8200 ft) | |||||
Distribution |
AL; IA; IL; IN; KS; KY; LA; MI; MN; MO; MS; NC; NE; NY; OK; PA; SD; TN; TX; VT; WI; ON; QC
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CA; CO; ID; MT; NV; OR; WA; WY; AB; BC
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Discussion | Varieties 2 (2 in the flora). Symphyotrichum ontarionis is often confused with S. lateriflorum, from which it can be distinguished by its shorter disc corolla lobes and abaxial leaf faces either moderately to densely hairy or glabrous to glabrate (var. glabratum), and without hairs along midveins (as is typical of S. lateriflorum). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Two poorly defined varieties of Symphyotrichum campestre have been described. Variety campestre has glabrous or sparsely strigose leaves and occurs in southern British Columbia, Colorado, Idaho, Montana, Nevada, Oregon, Washington, and Wyoming. Bloomer’s Aster, var. bloomeri, has moderately strigose leaves and occurs in California, Nevada, and Oregon. The varieties are not sufficiently distinct to warrant recognition. Symphyotrichum ×columbianum (Piper) G. L. Nesom (syn. Aster columbianus Piper, A. multiflorus Aiton var. columbianus (Piper) S. F. Blake, Virgulus ×columbianus (Piper) Reveal & Keener) is the hybrid between S. campestre and S. ericoides subsp. pansum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 518. | FNA vol. 20, p. 484. | ||||
Parent taxa | Asteraceae > tribe Astereae > Symphyotrichum > subg. Symphyotrichum > sect. Symphyotrichum | Asteraceae > tribe Astereae > Symphyotrichum > subg. Virgulus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Aster ontarionis, Aster missouriensis | Aster campestris, Aster bloomeri, Aster campestris var. bloomeri, S. campestre var. bloomeri, Virgulus campestris | ||||
Name authority | (Wiegand) G. L. Nesom: Phytologia 77: 287. (1995) | (Nuttall) G. L. Nesom: Phytologia 77: 276. (1995) | ||||
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