3. Gentianopsis detonsa (Rottbøll) Ma, Acta Phytotax. Sin. 1: 15. 1951.
Sheared or serrate gentian
Gentiana detonsa Rottbøll, Skr. Kiøbenhavnske Selsk. Laerd. Elsk. 10: 435, plate 1, fig. 3. 1770; Gentianella detonsa (Rottbøll) G. Don
Herbs annual or biennial, 0.2–6 dm. Stems: branching diverse, often from base as well as distally. Leaves: basal usually persistent and green at flowering, blades narrowly obovate to spatulate, oblanceolate, oblong, or linear (subsp. raupii) 0.5–3.5(–6) cm × 3–18 mm, apex rounded or obtuse, sometimes subacute or acute (subsp. detonsa), at least distal cauline blades oblanceolate, narrowly elliptic, lanceolate, or linear, (0.5–)1.5–6.5 cm × 1–7(–15) mm, apex rounded to obtuse, or usually acute (subsp. detonsa). Peduncles (0.3–)1–15 cm. Flowers often 1 per primary stem, occasionally 2–5; calyx 7–30 mm, keel smooth, all or at least inner lobes less than 1.5 times as long as tube, lobes ovate to narrowly lanceolate, varying with subspecies; corolla pale to deep blue or occasionally pale yellow or white, 12–50 mm, lobes oblong, oblong-lanceolate, oblong-triangular, oblong-orbiculate, or proximally oblong, distally obovate to suborbiculate, varying with subspecies, 5–20 × 4–12(–15) mm, margins proximally fringed or merely erose to dentate, distally dentate; ovary ± short-stipitate. Seeds papillate, not winged.
Subspecies 4 (4 in the flora): North America, Eurasia.
References to Gentianopsis detonsa in the Rocky Mountains from Montana south to New Mexico have been based on circumscriptions of the species that included G. thermalis. Specimens formerly so identified from Illinois, Indiana, and Ontario south of the James Bay region are G. virgata subsp. virgata. Those from Minnesota are G. virgata subsp. macounii.
