Lemmon's Fleabane

Erigeron lemmonii is found only in the Scheelite Canyon, Huachuca Mountains (Cochise County), on Fort Huachuca Military Reservation. The basal portion of the stems may be "subnaked and rhizomatous in appearance, but apparently not subterranean" (A. Cronquist 1947).

Perennials, 10–25(–60) cm; taprooted. Stems decumbent-ascending to prostrate (greenish, sometimes producing erect branches), hirsute to hispido-pilose, minutely glandular. Leaves basal (not persistent) and cauline; (greenish) proximal blades oblanceolate to obovate, 5–12 × 1–3 mm, reduced distally, margins with 1–2 pairs of teeth or shallow lobes, distal entire, faces piloso-hirsute, densely minutely glandular. Heads 1–3. Involucres 2.5–4 × 5–10 mm. Phyllaries in 2–3(–4) series (erect, apices appressed), sparsely piloso-hirsute, minutely glandular. Ray florets 42–60, corollas white, without abaxial midstripe, 3–7 mm, laminae not coiling or reflexing. Disc corollas 1.8–2.4 mm. Cypselae 1–1.2 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 7–10 bristles.

Erigeron lemmonii is a rare species of flowering plant in the family Asteraceae known by the common name Lemmon's fleabane. It has been found only in Scheelite Canyon on the grounds of Fort Huachuca Military Reservation in Cochise County, Arizona.

Erigeron lemmonii is a branching perennial herb up to 60 centimeters (2 feet) tall, producing a woody taproot. The leaves and the stem are covered with hairs. The plant generally produces only 1-3 flower heads per stem, each head with up to 60 white ray florets surrounding numerous yellow disc florets. The species grows shaded cliff-faces in pine-oak forest.

The species is named for John Gill Lemmon (1831 - 1908), husband of prominent American botanist Sarah Plummer Lemmon (1836 – 1923).