117.
Erigeron elatus
(Hooker) Greene, Pittonia. 3: 164. 1897.
Swamp fleabane, vergerette élevée
Erigeron alpinus
Linnaeus var.
elatus
Hooker, Fl. Bor.-Amer. 2: 18. 1834;
E. acris
Linnaeus var.
arcuans
Fernald;
E. acris
var.
elatus
(Hooker) Cronquist;
E. elatus
var.
oligocephalus
(Fernald & Wiegand) Fernald;
Trimorpha elata
(Hooker) G. L. Nesom
Biennials or short-lived perennials,
(6—)10—40(—50) cm; fibrous-rooted, caudices simple or branched, or rhizomes.
Stems
erect, sparsely to moderately strigose or loosely strigoso-villous or glabrate, often minutely glandular near heads.
Leaves
basal (persistent) and cauline; basal blades oblanceolate to spatulate, 20—80 × 2—6 mm, cauline gradually reduced distally, margins usually entire, rarely dentate, glabrous or sparsely villoso-hirsute, distal sometimes also glandular.
Heads
1—5(—8) in corymbiform arrays (on straight, spreading peduncles).
Involucres
5—11 × 8—12 mm.
Phyllaries
in 2—3 series (inner apices attenuate to caudate), sparsely hirsute to villoso-hirsute, eglandular or sparsely minutely glandular only at tips.
Ray (pistillate) florets
in 2 series: outer 45—60, corollas white to pink, 5—7 mm, laminae (filiform) erect, not coiling or reflexing; inner far fewer than outer, elaminate.
Disc corollas
4.2—6.2 mm.
Cypselae
1.6—1.8 mm, 2-nerved, faces sparsely strigose;
pappi:
outer of setae, inner of 24—35 (accrescent) bristles.
2
n
= 36.
Flowering (Jun—)Jul—Aug. Floodplain meadows, pond edges, open boggy woods, tundra; 200—2000 m; Alta., B.C., Man., Nfld. and Labr., N.W.T., Ont., Que., Sask., Yukon; Alaska, Wash.
