AFRICAN

ORCHIDS

Tribe Diseae Dressl. Selbyana 5(2): 204. 1979.

Description:

Plants with underground, ovoid to ellipsoid tuber or tubers. Stems of one or two kinds, in the last case flowering stem with sheath-like, more or less imbricating leaves, adpressed to the stem and sterile stem with normal leaves.

Inflorescence few- to many-flowered. Flowers resupinate. Lip usually simple, linear, sometimes fimbriate. Dorsal sepal spurred. Spur entrance behind or above the with each lobe separated or stalked. Rostellum predominantly tri-lobed, sometimes with both lateral lobes elongate, with a more or less prominent pleat on the abaxial surface of the midlobe, suberect to horizontal.

Both lateral rostellum lobes produce a cellular viscidium, which may be secondarily fused together. Sometimes the viscidium is hooked on the inner surface. Anther fused stiffly with the gynostemium apex, immovable, erect to reflexed, 2-chambered, locules diverging basally. Connective usually wide, distinctly separating the locules. Dorsal side of the anther with two fleshy appendages, so-called auricles, composed of very large inflated cells, including raphides. Anther base near the rostellum base.

Pollinia exclusively sectile.

Bibliography and References:

Kurzweil H. 2003 The orchid tribe Diseae. Orchid Rev. 111. (1254): 333-338 (2003)