re
=Purple Coneflower, Brauneria pallida.=

212a. Rays broadly obovate; heads 1-2 cm. wide (3-6 dm. high)
=Sneezewort, Achillea ptarmica.=

212b. Rays oblong or narrowly elliptical --213.

213a. Leaves serrate (3-10 dm. high)
=Ox-eye Daisy, Chrysanthemum leucanthemum var. pinnatifidum.=

213b. Leaves entire (8-25 dm. high) =Boltonia, Boltonia asteroides.=

214a. Involucral bracts all the same length or nearly so and
narrow, or with a few short outer ones; plants blooming in
spring and summer, or a few plants persisting in bloom until
autumn (Fleabane) --215.

214b. Involucral bracts unequal, the outer successively shorter (or
rarely nearly equal), loosely or closely overlapping; plants
3-15 dm. high, blooming in late summer and autumn (Aster)
--221.

215a. Rays short and inconspicuous, barely longer than the pappus (1-5
dm. high; summer) =Fleabane, Erigeron acris var. asteroides.=

215b. Rays conspicuous, spreading, 3 mm. long or more --216.

216a. Rare plants of the Northern Peninsula, with entire leaves and
stems 1-5 dm. high, from a thick woody root (flowers white or
purple, summer) --217.

216b. Common species, with erect stems from fibrous roots; leaves
toothed (except in one species) --218.

217a. Heads 3-5 cm. wide; rays about 100
=Fleabane, Erigeron glabellus.=

217b. Heads 1-2 cm. wide; rays 20-30
=Fleabane, Erigeron hyssopifolius.=

218a. Stem unbranched, except for the peduncles; leaves chiefly
basal; heads 1-9 (2-5 dm. high; flowers pale-purple, spring)
=Fleabane, Erigeron pulchellus.=

218b. Stem branched; principal leaves on the stem; heads usually
numerous (3-12 dm. high; spring and summer) --219.

219a. Stem-leaves linear, entire =Fleabane, Erigeron ramosus.=

219b. Stem-leaves ovate-lanceolate, the principal ones toothed --220.

220a. Rays 100 or more, light-purple or pink
=Fleabane, Erigeron philadelphicus.=

220b. Rays much fewer, white =Fleabane, Erigeron annuus.=

221a. Basal leaves petioled and heart-shape at the base --222.

221b. Basal lea