Coefficient of Conservatism:
Coefficient of Wetness:
CLOSED GENTIAN, BOTTLE GENTIAN
Marshy or at least moist ground: meadows and wet prairies; shores, thickets, and ditches; river banks, floodplains, swamps. Our commonest species of closed or bottle gentian.
Each corolla lobe terminates in a small tooth or mucro. White-flowered individuals [f. albiflora Britton] occur occasionally with the normal blue ones, and pale blue flowers also occur uncommonly. White- or blue-flowered plants may be easily distinguished from G. saponaria, which also has ciliate calyx lobes, by the broader leaves of G. andrewsii (as broad as in G. alba) as well as the very short tips of the corolla lobes. Hybrids with G. alba [G. ×pallidocyanea J. S. Pringle] have been identified by Pringle from Genesee and Wayne Cos. The hybrid with G. puberulenta [G. ×billingtonii Farw.] was originally described from Squirrel Island on the Ontario side of the St. Clair River, and may turn up in Michigan, as might the rare hybrid with G. rubricaulis [G. ×grandilacustris J. S. Pringle], described from Minnesota.