Lackschewitz's Fleabane

Erigeron lackschewitzii is closely similar to E. ochroleucus and perhaps derived from it.

Perennials, 3.5–8 cm; taprooted, caudices simple or branched, relatively long, woody. Stems erect (scapiform), loosely white lanate-villous, sometimes sparsely minutely glandular. Leaves basal (persistent) and cauline (leaf bases broadened or not, not thickened and whitish-indurate); basal blades linear-oblanceolate to narrowly oblanceolate, 20–60 × 1.2–3 mm, cauline (on proximal ¹ / 2 of stems) similar to basal or slightly reduced, margins entire (apices acute), adaxial faces loosely strigose to villous (or hairs mixed, appressed and spreading), abaxial glabrate, eglandular. Heads 1. Involucres 6–8 × 12–17 mm. Phyllaries in 3 series, densely white-villous (hairs sometimes with blackish purple cross walls), densely minutely glandular. Ray florets 30–68; corollas purple to lavender, 8–11 mm, laminae coiling. Disc corollas 3.5–4.3 mm. Cypselae 2.3–2.8 mm, 2-nerved, faces strigose; pappi: outer of setae and scales, inner of 15–24 bristles.

Erigeron lackschewitzii is a rare species of flowering plant in the family Asteraceae known by the common name Lackschewitz's fleabane. It is native to the Rocky Mountains in the Canadian province of Alberta and the US state of Montana.

Erigeron lackschewitzii is a small perennial herb rarely more than 8 centimeters (0.8 inches) tall, producing a woody taproot. The leaves are mostly crowded around the base of the stem. The plant generally produces only one flower head per stem, each head with up to 68 purple or lavender ray florets each measuring 8-11 millimeters (0.3-0.4 inches) long. These surround numerous yellow disc florets in the center.

The species is named for plant collector Klaus Heinrich Lackschewitz.