Symphyotrichum anticostense
Symphyotrichum laurentianum
Anticosti American-aster, Anticosti aster, Anticosti Island aster, aster d'Anticosti
aster du golfe du saint-laurent, Gulf Of St. Lawrence aster
1, erect (straight, often reddish), glabrous.
1, decumbent to erect (straight), glabrous.
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.
± fleshy, margins entire, eciliate, apices obtuse, faces glabrous;
basal deciduous at bolting, petiolate, blades oblanceolate 44–50 × 5–7 mm [cult.], bases attenuate;
proximal cauline and some distal withering by flowering;
cauline sessile, blades linear-lanceolate to spatulate, 15–55 × 1–4 mm, reduced distally, bases cuneate;
distal sessile, blades linear-lanceolate to spatulate.
0.8–5.7 cm, slender, sparsely ot moderately pilosulous, bracts 3–5, linear-lanceolate, often crowded proximal to and surpassing heads.
glabrous, bracts linear.
campanulate, 6–10 mm.
campanulate, 5–8+mm.
25–44;
corollas usually pale purple or lilac, sometimes white, laminae 9.5–20 × 0.7–1.4 mm.
0.
14–47+ in 2–3+ series;
laminae 0 (corolla tubes 2–2.4 mm, shorter than style branches).
29–52;
corollas yellow becoming reddish purple, 5–6 mm, tubes slightly shorter than funnelform throats, lobes lanceolate, 0.6–0.7 mm.
5–8+;
corollas yellow, 3.1–3.9 mm, lobes deltate to triangular, 0.2–0.3 mm.
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.
in 3–4 series, lanceolate, subequal, bases scarious, margins eciliate, green zones foliaceous (outer), apices obtuse, faces glabrous.
in elongate, loosely racemiform arrays, branches ascending, heads single at ends of primary branches or long pedicels.
(disciform) in ± densely paniculiform arrays.
reddish tan, obovoid, compressed, 1.5–2.8 mm, 4–5-nerved, faces strigillose;
pappi yellowish, 7–8 mm.
purple, obovoid, ± compressed, 2.8–2.9 mm, 2–4-nerved, faces strigillose;
pappi white to yellowish white, 4.8–5.2 mm.
= 80.
= 14.
Symphyotrichum anticostense
Symphyotrichum laurentianum
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Symphyotrichum laurentianum is known only from the southern shores of the Gulf of St. Lawrence.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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