Flora of North America species comparison

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Erigeron acris var. kamtschaticus
Photo is of parent taxon

bitter fleabane, Kamchatka bitter fleabane, vergerette du kamtchatka
Habit Annuals, biennials, or short-lived perennials, 20–60(–80) cm; usually fibrous-rooted, sometimes apparently taprooted, slender caudices simple or branched.
Stems

erect, sparsely to moderately strigose or loosely strigoso-villous or nearly glabrous, often also minutely glandular distally.
Leaves

basal (persistent) and cauline;

blades oblanceolate to spatulate, 20–140 × 3–16 mm, cauline spreading, gradually reduced distally, margins usually entire, rarely serrate-dentate, faces glabrous or sparsely villoso-hirsute, distal sometimes also glandular.
Involucres

5–11 × 8–22 mm.
Ray (pistillate) florets

in 2 series;

outer 150–250, corollas white to pink or purplish, laminae 3–4.5 mm (filiform), erect;

inner fewer than outer, corollas tubular, elaminate.
Disc corollas

4.2–6.2 mm.
Phyllaries

in 2–3(–4) series (often purplish, inner apices attenuate to caudate), glabrous or sometimes sparsely hirsute, minutely glandular.
Heads

1 or 3–35 in corymbiform to thyrsiform arrays (peduncles curved-ascending).
Cypselae

2–2.4 mm, 2-nerved, faces sparsely strigose;

pappi: outer of setae, inner of (18–)25–35 (accrescent) bristles.
2n

= 18.

Erigeron acris var. kamtschaticus
Phenology Flowering Jun–Aug(–Sep).
Habitat Rocky and sandy sites, riverbanks, roadsides, and other disturbed sites
Elevation 900–3100 m (3000–10200 ft)
Distribution
from FNA
AK; CO; ID; ME; MI; MN; MT; SD; UT; WA; WY; AB; BC; LB; MB; NB; NT; NU; ON; QC; SK; YT; e Asia (Russian Far East)
[BONAP county map]
Discussion

Erigeron angulosus Gaudin, E. asteroides Andrzejowski ex Besser, E. droebachiensis O. F. Mueller ex Retzius, E. elongatus Ledebour, and E. politus Fries, names previously used for the widespread American plants of var. kamtschaticus, refer to Eurasian endemics (summary in G. L. Nesom 2004e). E. Hultén (1968) restricted the name var. kamtschaticus to a single North American collection made at “Junction Firth R. and Mancha Creek on the Alaska-Yukon boundary in August 1961,” treating all others of the species in North America as subsp. politus. Entire-leaved plants apparently are the common form of the species even in the Kamtschatka area, and var. kamtschaticus appears to be correct at varietal rank for the North American plants. Erigeron kamtschaticus has been treated as a species separate from E. acris in other recent literature. Circumscription and rank of E. acris and closely related taxa are in need of study.

Erigeron lapiluteus A. Nelson is not a legitimate name.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 321.
Parent taxa Asteraceae > tribe Astereae > Erigeron > Erigeron acris
Synonyms E. kamtschaticus, E. acris subsp. kamtschaticus, E. yellowstonensis, Trimorpha acris var. kamtschatica
Name authority (de Candolle) Herder: Bull. Soc. Imp. Naturalistes Moscou 38: 392. (1865)
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Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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