Aster borealis (Torr. & A.Gray) Prov.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Plants slender, from long rhizomes seldom over 2 mm thick; stem 1.5–10 dm, glabrous below, puberulent above in decurrent lines, seldom over 2.5 mm thick; lvs chiefly cauline, linear to lance-linear or oblong-linear, 4–13 cm × 2–5(–9) mm, sessile and usually slightly auriculate-clasping, entire or subentire, generally scabrous on the margins and sometimes puberulent along the midrib beneath, ascending, mostly thin and lax; heads few to sometimes rather many in an open, usually short and broad infl, or occasionally solitary in small plants; invol 5–7 mm, glabrous, its slender, mostly acute bracts ± strongly imbricate, often with purple tip or margins; rays 20–50, white to pale blue or lavender, 7–15 mm; lobes of the disk-cors comprising 15–30% of the limb; 2n=16, 32, 48, 64. Cold bogs; n. N.J. to Que., w. to Minn., Colo., and Alas. (A. junceus, misapplied; A. junciformis)