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Symphyotrichum laurentianum
(Fernald) G.L. Nesom
(redirected from:
Aster laurentianus var. contiguus
)
Family:
Asteraceae
Gulf-of-St. Lawrence American-Aster
[
Aster laurentianus var. contiguus
]
FNA
Resources
Luc Brouillet, John C. Semple, Geraldine A. Allen, Kenton L. Chambers, Scott D. Sundberg+ in Flora of North America (vol. 20)
Annuals,
1-13+ cm.
Stems
1, decumbent to erect (straight), glabrous.
Leaves
± 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.
Heads
(disciform) in ± densely paniculiform arrays.
Peduncles
glabrous, bracts linear.
Involucres
campanulate, 5-8+mm.
Phyllaries
in 3-4 series, lanceolate, subequal, bases scarious, margins eciliate, green zones foliaceous (outer), apices obtuse, faces glabrous.
Ray florets
0.
Pistillate florets
14-47+ in 2-3+ series; laminae 0 (corolla tubes 2-2.4 mm, shorter than style branches).
Disc florets
5-8+; corollas yellow, 3.1-3.9 mm, lobes deltate to triangular, 0.2-0.3 mm.
Cypselae
purple, obovoid, ± compressed, 2.8-2.9 mm, 2-4-nerved, faces strigillose;
pappi
white to yellowish white, 4.8-5.2 mm.
2
n
= 14.
Flowering Aug-Sep. Brackish sand and mud, intertidal salt marshes, moist dune slacks; of conservation concern; 0 m; N.B., P.E.I., Que.
Symphyotrichum laurentianum
is known only from the southern shores of the Gulf of St. Lawrence.
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