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FNA | Family List | FNA Vol. 20 | Asteraceae | Canadanthus

1. Canadanthus modestus (Lindley) G. L. Nesom, Phytologia. 77: 251. 1995.

Great northern or western bog aster, aster modeste

Aster modestus Lindley in W. J. Hooker, Fl. Bor.-Amer. 2: 8. 1834; A. major (Hooker) Porter; A. modestus var. major (Hooker) Muenscher; A. sayianus Nuttall; A. unalaschensis Lessing ex Bongard var. major Hooker; Weberaster modestus (Lindley) Á. Löve & D. Löve

Plants openly colonial; rhizomes 1–3+ from base of each stem, herbaceous, ± woody with age. Stems 1, often glabrate proximally to ± villous, distally stipitate-glandular. Leaves: proximal scalelike, withering by flowering; blades (16–)50–130 × (4–)10–30(–40) mm, reduced distally, thin, bases auriculate-clasping, margins ± scabrous to (distal) stipitate-glandular. Heads (1–)2–40+. Peduncles sometimes villous, densely stipitate-glandular; bracts 1–2(–3), linear-lanceolate, stipitate-glandular. Phyllaries squarrose, innermost appressed, apices often ± purplish, acuminate. Ray floret laminae 7–11(–15) × 0.8–1.2 mm. Disc floret corollas 5–7 mm, glabrous, lobes 0.5–0.7 mm. Cypselae stramineous, stipitate; pappi surpassing or ± equaling disc corollas. 2n = 18.

Flowering late summer–early fall. Cold, wet soils, often ± calcareous, moist woodlands, often along streams, lake shores, alder thickets, open fields, cedar swamps, in montane and boreal forests; 0–1300+ m; Alta., B.C., Man., N.B., Ont., Sask., Yukon, Que.; Alaska, Idaho, Mich., Minn., Mont., N.Dak., Oreg., Wash.


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