Pelton’s or Arkansas rose-gentian

Herbs annual. Stems 4-angled with wings to 0.2 mm wide, branching alternate or proximal rarely opposite. Leaves all cau­line at flowering time; blade linear to narrowly lanceolate, 0.7–3 cm × 1–4.5(–6) mm. Inflo­rescences open cymes; pedicels (2–)10–40 mm. Flow­ers 5-merous; calyx tube campanulate, 2.8–5.5 mm, commissural veins more prominent than midveins, ridged, lobes linear, 9–13 mm; corolla purplish pink or rarely white, eye yellow or yellowish green, projections of eye into corolla tube oblong to narrowly triangular, alternating with shorter white or paler yellow zones, tube 3–7 mm, lobes narrowly spatulate-obovate, 8–18 × 3–6 mm, apex rounded; anthers coiling circinately.

Flowering summer. Seasonally wet sites in glades; of conservation concern; 100–200 m; Ark.

Sabatia arkansana is known only from shale and nepheline syenite glades in Saline County.