Glabrella species

Wen, Fang, Wei, Yi-Gang & Möller, Michael, 2015, Glabrella leiophylla (Gesneriaceae), a new combination for a former Briggsia species from Guizhou, China, Phytotaxa 218 (2), pp. 193-194 : 194

Key to Glabrella species

1a. Leaf blade base narrowly cuneate to broadly cuneate, margin entire; corolla pale yellow to bright yellow; calyx segments unequal, the top central one ca. 6.0 × 1.5 mm, the others ca. 6 × 2 mm; peduncle sparsely glandular-pubescent........................ G. leiophylla

1b. Leaf blade base cuneate, margin crenate-serrate; corolla blue-purple; calyx segments usually equal, 4–7 × 1.5–3 mm; peduncle glabrous to glabrescent ........................................................................................................................................................ G. mihieri

1c. Leaf blade base peltate or rounded to nearly cuneate, margin entire to shallowly serrate; corolla blue-purple or pale purple; calyx segments usually equal, 8–11 × 2–5 mm; peduncle sparsely villous, rarely glabrescent.................................................. G. longipes