170.
Erigeron strigosus
Muhlenberg ex Willdenow, Sp. Pl. 3: 1956. 1803.
Common eastern fleabane, vergerette rude
Erigeron annuus
(Linnaeus) Persoon subsp.
strigosus
(Muhlenberg ex Willdenow) Wagenitz
Annuals, biennials, or short-lived perennials,
30—70 cm; fibrous-rooted, caudices simple, sometimes lignescent, sometimes producing rhizomes that bear leaf tufts at upturned ends.
Stems
erect or ascending, sparsely to moderately strigose to strigillose or hirsuto-strigillose (hairs usually ascending, rarely spreading, 0.1—1.2 mm), eglandular.
Leaves
basal (usually persistent through flowering) and cauline; basal blades spatulate to broadly or narrowly oblanceolate to linear, (10—)30—150(—170) × 5—15(—21) mm, cauline usually gradually reduced distally, continuing to near heads, margins entire or shallowly to deeply serrate or crenate, faces glabrous or glabrate to sparsely strigose or strigoso-hirsute, eglandular.
Heads
10—200+ in loosely corymbiform to paniculiform-corymbiform arrays (on distal branches).
Involucres
(2—)3—4 × 5—12 mm.
Phyllaries
in 2—4 series, glabrous, strigose, or sparsely hirsute, sometimes minutely glandular.
Ray florets
50—100; corollas white, less commonly pinkish or bluish, 4—6 mm, laminae coiling.
Disc corollas
1.5—2.5 mm (throats sometimes slightly indurate and inflated).
Cypselae
(0.5—)0.9—1.2 mm, 2-nerved, faces sparsely strigose;
pappi:
outer crowns of setae or scales, inner 0 (rays) or of 8—15 bristles (disc).
Varieties 4 (4 in the flora): North America; introduced in Europe, Pacific Islands (Hawaii).
