Symphyotrichum anticostense

(Fernald) G. L. Nesom
Phytologia 77: 275. 1995.
Common names: Anticosti aster aster d’Anticosti
EndemicConservation concern
Basionym: Aster anticostensis Fernald Rhodora 17: 16. 1915
Synonyms: Aster gaspensis Victorin Aster hesperius var. gaspensis (Victorin) B. Boivin
Treatment appears in FNA Volume 20. Treatment on page 529. Mentioned on page 478, 501, 530.

Perennials, 10–90 cm, colonial; long-rhizomatous. Stems 1, erect (straight, often reddish), glabrous. Leaves coriaceous, margins remotely serrulate or entire, slightly revolute, scabrous, apices mucronulate, faces glabrous; basal withering by flowering, long-petiolate (petioles narrowly winged, bases sheathing), blades lanceolate to oblanceolate, ca. 55+ × 3+ mm, bases slightly attenuate, apices acute; proximal cauline mostly withering by flowering, petiolate (petioles narrowly winged, sheathing), blades lanceolate or oblanceolate to linear-lanceolate or -oblanceolate, arcuate, 90–160 × 5–18 mm, bases cuneate to slightly attenuate, margins entire or serrulate, apices acute; distal sessile, blades linear to linear-lanceolate, 8–50 × 1.5–5 mm, progressively reduced distally, more strongly so in arrays, bases cuneate to rounded, sometimes slightly clasping, apices acute to acuminate. Heads in elongate, loosely racemiform arrays, branches ascending, heads single at ends of primary branches or long pedicels. Peduncles 0.8–5.7 cm, slender, sparsely ot moderately pilosulous, bracts 3–5, linear-lanceolate, often crowded proximal to and surpassing heads. Involucres campanulate, 6–10 mm. Phyllaries in 2–3 series, oblong-oblanceolate or -spatulate (outer) or oblong-lanceolate to linear-lanceolate or linear (inner), ± unequal, bases indurate 1/3–3/4, margins hyaline, scarious, erose distally, sparsely ciliolate distally, green zones lanceolate, outer often foliaceous distally, apices acute to long-acuminate, ± spreading, faces glabrous. Ray florets 25–44; corollas usually pale purple or lilac, sometimes white, laminae 9.5–20 × 0.7–1.4 mm. Disc florets 29–52; corollas yellow becoming reddish purple, 5–6 mm, tubes slightly shorter than funnelform throats, lobes lanceolate, 0.6–0.7 mm. Cypselae reddish tan, obovoid, compressed, 1.5–2.8 mm, 4–5-nerved, faces strigillose; pappi yellowish, 7–8 mm. 2n = 80.


Phenology: Flowering Aug–Sep.
Habitat: Calcareous, gravelly shores of rivers, lakeshore limestone pavements
Elevation: 0–100 m

Discussion

Of conservation concern.

Symphyotrichum anticostense is known from disjunct areas: western Lake St. John, southern Anticosti Island, southern streams of the Gaspé Peninsula (Quebec), Restigouche River (Quebec–New Brunswick), and St. John (New Brunswick) and Aroostook (Maine; A. Haines 2000) rivers. It is an allopolyploid derivative of the cross between the calcareous fen species S. boreale and the widespread shore species S. novi-belgii (J. Labrecque and L. Brouillet 1990). It hybridizes with S. novi-belgii.

Selected References

None.

Lower Taxa

None.

Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Fernald) G. L. Nesom +
Aster anticostensis +
Anticosti aster +  and aster d’Anticosti +
N.B. +, Que. +  and Maine. +
0–100 m +
Calcareous, gravelly shores of rivers, lakeshore limestone pavements +
Flowering Aug–Sep. +
Endemic +  and Conservation concern +
Aster gaspensis +  and Aster hesperius var. gaspensis +
Symphyotrichum anticostense +
Symphyotrichum sect. Symphyotrichum +
species +