AFRICAN

ORCHIDS

Key to the infrageneric groups of Bulbophyllum occurring in continental Africa:

1 Lateral sepals connate along their upper margins Group 11
  Lateral sepals not connate along their upper margins 2
2 Abaxial side of the sepals with long hairs Group 3
  Abaxial side of the sepals without long hairs 3
3 Lateral sepals reflexed at the very base and appressed against the rhachis Group 4
  Lateral sepals either reflexed or not, but not appressed against the rhachis 4
4 Anther with a dorsoventrally flattened, rounded, truncate to bifid protrusion in front which overtops the front margin 5
  Anther either without a protrusion in front, or with a protrusion which may overtop the front margin but which is not dorsoventrally flattened 9
5 Flowers scattered, or flowers 1-2 6
  Flowers distichous, 3 or more 7
6 Flowers 3 or less
  Flowers 8 or more Group 7
7 Stelidia 1-1.2 mm long, about as long as the body of the column, narrowly acute to acuminate Group 6
  Stelidia 0.5 mm or shorter, much shorter than the body of the column, at most shortly acute 8
8 Floral bracts 1.5 times as long as the flower (pedicel and ovary included) or longer; lip with seamlike, thin lateral lobes which are distinctly separated from the median lobe and which have denticulate margins Group 8
  Floral bracts as long as the flower (pedicel and ovary included) or shorter; either lip without lateral lobes; or lip with semi-orbicular to obovate lateral lobes Group 9
9 Rhachis flattened with the flowers inserted along the midnerve; or lip fleshy but soft and very easy to compress (very thin when dry); or both characters present Group 5
  Rhachis not flattened with the flowers inserted along the midnerve, and lip either not fleshy or fleshy but not soft and easy to compress 10
10 Pseudobulbs 1-leafed Group 1
  Pseudobulbs 2-leafed 11
11 Flowers scattered Group 2
  Flowers distichous Group 1

Referrence:

A taxonomic revison of the continental African Bulbophyllinae by J.J. Vermeulen