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FNA | Family List | FNA Vol. 20 | Asteraceae | Erigeron

170a. Erigeron strigosus Muhlenberg ex Willdenow var. calcicola J. R. Allison, Castanea. 66: 173, fig. 7. 2001.

Limestone fleabane

Perennials ; often rhizomatous (sometimes not apparent on collections), bearing overwintering leaf tufts at upturned ends. Stems glabrate to sparsely strigose (hairs appressed to ascending, 0.2–0.5 mm), more densely strigose immediately proximal to heads. Leaves: basal blades oblanceolate to narrowly obovate or spatulate, (3.2–)3.8–15(–21) mm wide, margins entire with 1–2 pairs of shallow lobes (margins and midveins ciliate; cauline faces glabrous). Involucres 2–3 mm. Phyllaries glabrous or sparsely strigose (hairs terete, 0.1–0.4 mm).

Flowering (Apr–)May–Oct. Limestone glades; ca. 100–200 m; Ala., Ga., Tenn.

Variety calcicola, even when lacking rhizomes and rosettes, can be distinguished from var. strigosus by its essentially glabrous leaf faces. Some plants intermediate between var. calcicola and var. strigosus in leaf width and density of pubescence have been found in roadside glade habitats.


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