Cynoglossum virginianum

From Flora of Indiana (1940) by Charles C. Deam

Frequent in the southern half of the state and rare in the northern part. My Lagrange County specimen is not shown on the map. It is strictly a woodland species found mostly on wooded slopes of white oak, black and white oak, and beech. Careful measurements of our specimens in anthesis show the following results. In 3 specimens the calyx was from 2-2.5 mm in length, the corolla from 11-14 mm in width, the lobes orbicular, and the sinuses closed; in 7 specimens the calyx was 3 mm long, the corolla from 11.5-16 mm wide, the lobes orbicular, and the sinuses closed; and in 4 specimens the calyx was 3.5-4 mm long, corolla 14-16 mm wide, the lobes orbicular, and the sinuses closed. Not included in the preceding measurements I have a specimen from Franklin County, no. 34008, with a calyx 2.5 mm long, corolla 9 mm wide, the lobes oblong, and the sinuses open; and one specimen from Jennings County with a calyx 2 mm long, corolla 9 mm wide, the lobes oblong, and the sinuses open. Cynoglossum boreale Fern., a northern species, is described as having a calyx 2-2.5 mm long; corolla 6-8 mm wide, the lobes ovate-oblong, and the sinuses open. Our Franklin and Jennings County specimens belong, no doubt, to this species. The preceding measurements convince me that our specimens belong to one variable species. Johnston (Contr. Gray Herb. Harvard Univ. 70: 34. 1924), in his synopsis of the genus, says: "All the vegetative characters of this species [Cynoglossum boreale] can be matched, after a short search, among undubitable material of C. virginianurn." Peattie reported Cynoglossum boreale from the dune area but I have not seen his specimen if he preserved one. Buhl (Amer. Midland Nat. 16: 262. 1935) says this report lacks confirming specimens.