FLORA OF ADEN. 
25 
Carnivorous flies are attracted by the smell and deposit their larvae in 
the corolla-tube. It is probable that, by doing* so, they are the agents 
of pollination, carrying the pollinia of one plant to another. 
2. Caralluma Forskalii (Dene.) K. Schum. in Engl.-PrantL 
Pflanzenfam. IV, 2, 277. 
Boucerosia Forskalii Dene. Prodr. VIII, 618 ; Defl. M6m. de PInst.. 
d'Egypte III, 270. 
Boucerosia cicatricosa Defl. Voy. Yemen, p. 170, tab. IV. 
Desmidorchis, Ehrenberg in Linnaea 1829, p. 24. 
Arabic name : — Dra el Kelb, Kousma (Schweinf.). 
Description : — Branches acutely tetragonous ; angles obtusely cal- 
loso-dentate ; callosities orbicular. 
Umbels terminal, multi-flowered. Flowers very short-pedicelled. 
Corolla-lobes densely verrucose glabrous. 
Follicles linear-oblong, sub angular. 
Locality : — Goldmore Valley (Defl.); without locality (Balfour). 
Distribution : — Yemen : Mount Saber. 
7, Kanaliia H. 15 r. 
Shrubs with straight erect branches and milky juice. Leaves opposite., 
linear-lanceolate or linear, with minute bristles in their axils. 
Inflorescence lateral at the nodes, with the peduncles racemosely 
scattered along the upper part of the branches. Flowers spirally arranged^ 
around the slightly thickened apical part of the peduncle, which becomes 
more or less elongated into a flowering axis, pedicellate, bracteate, 
developing successively, never strictly umbellate. Calyx 5-partite. Corolla 
5-lobed to half-way down or nearly to the base ; lobes ascending, 
spreading or reflexed, slightly overlapping to the left in the bud. Corona 
of 5-lobes arising from the stamina!- column, either very thick and fleshy, 
solid and produced into a short horizontally indexed subulate entire 
or bifid beak at the apex, or more or less complicate or cleft down the 
inner face. Staminal column arising from the bottom of the corolla; 
anthers erect, with membranous appendages indexed over the apex of the 
style. Pollen-masses pendulous, solitary in each anther- cell, attached 
in pairs to the pollen-carriers by short horizontal caudicles. Apex of 
the style with a convex central boss surrounded by a depressed ring 
and with 5 very minute tubercles close to the pollen-carriers. 
Follicles, fusiform-lanceolate or somewhat ovoid, not echinate. 
Species 4. 
Distribution /—Tropical Africa, extending to Arabia. 
