Leptomischus, Drake, 1895

Hareesh, Vadakkoot Sankaran, Wu, Lei & Sabu, Mamiyil, 2017, Leptomischus flaviflorus (Rubiaceae), a new species from India, Phytotaxa 332 (1), pp. 88-92 : 90

Key to the species of Leptomischus in the world

1. Leaf blades obtuse to acute or cuneate at base ……………………………………………............................................................. 2

- Leaf blades shallowly cordate or sub-truncate at base ………….……..……........................................................... L. guangxiensis

2. Corolla tubes less than 7 mm long, about equal to the calyx lobes, glabrous outside……................... .......................................….3

- Corolla tubes more than 10 mm long, longer than calyx lobes, pubescent outside…… .........................................................……. 4

3. Corolla lobes sub-triangular, apex obtuse to acute, margin thickened...……. .........................................................…. L. parviflorus

- Corolla lobes orbicular-ovate, apex apiculate, margin papery ………..……... .........................................................….. L. modestus

4. Stem well developed, intemodes more than 1 cm long, with leaves distributed along them; calyx and corolla densely villous (hairs multicellular), tomentose or pilosulous outside…………………………..….…….....................................................................…. 5

- Stem short, intemodes less than 1 cm long, with leaves crowded or rosulate; calyx and corolla pilose (hairs unicellular) ouside .... ...................................................................................................................................................................................... L. primuloides

5. Stipules entire; calyx lobes sub-triangular or narrowly triangular… .........................................................……….………….......... 6

- Stipules 3-fid; calyx lobes broadly ovate ………………………...…… ....................................................... ………..… L. wallichii

6. Calyx lobes twice longer than or nearly as long as calyx tube ……………….……….................................................................... 7

- Calyx lobes nearly thrice as short as calyx tube …..............................................................................................…….. L. flaviflorus

7. Calyx lobes broad triangular, nearly as long as calyx tubes............................................................................ ............. L. funingensis

- Calyx lobes narrowly triangular, twice as long as calyx tubes …….…......................................................... ..………... L. erianthus