Bolusiella, Schlechter, 1918

Verlynde, Simon, Dubuisson, Jean-Yves, Stévart, Tariq, Droissart, Murielle Simo-, Geerinck, Daniel, Sonké, Bonaventure, Cawoy, Valérie, Descourvières, Pascal & Droissart, Vincent, 2013, Taxonomic revision of the genus Bolusiella (Orchidaceae, Angraecinae) with a new species from Cameroon, Burundi and Rwanda, Phytotaxa 114 (1), pp. 1-22 : 4

Key to the species of Bolusiella :

1. Leaves not deeply sulcate on upper surface................................................................................................................. 2.

- Leaves deeply sulcate on upper surface....................................................................................................................... 5.

2. Pouch-like outgrowth at the base of the lower sepals and floral bract as long as the flower .................................... 3.

- Base of the lower sepals without outgrowth and floral bract strictly smaller than the flower ................................... 4.

3. Base of the inflorescence straight, spur 1.2 mm or longer .......................................................................... B. maudiae

- Base of the inflorescence fractiflex, spur up to 1.1 mm ............................................................................ B. fractiflexa

4. Leaves with rounded apex ............................................................................................................................. B. zenkeri

- Leaves with acute apex .................................................................................................................................. B. talbotii

5. Spur at right angle or partly curved under the lip, cylindrical,> 1mm ........................... B. iridifolia subsp. iridifolia

- Spur in the same plane as the lip, conical, <1mm long ........................................................ B. iridifolia subsp. picea