392 NATURAL HISTORY OF PLANTS. 
tains one or two seeds whose coats cover a fleshy exalbuminous 
embryo. 
Coleonema has sometimes tetramerous or hexamerous flowers. It 
consists of small ericoidal shrubs, natives of tropical Africa. In the 
four known species,' the branches are slender, and the leaves alter- 
nate, linear-pointed, odorous, covered with glandular punctures, with 
smooth, ciliate or serrulate edges. The flowers are terminal, solitary 
or united in few-flowered cymes, each accompanied by one or two 
bractlets applied against the base of the calyx. 
Beside Coleonema are placed seven very nearly allied genera, so 
nearly allied in fact, that they might perhaps be united into one 
generic group. All are from the same country, having the same 
habit and the same vegetative organs, the same glandular reservoirs, 
almost the same flowers, and fruits and seeds of the same organization. 
Their differential characters are inconsiderable. Thus Adenandra 
consists of Co/eonemas with sterile stamens not hidden in the groove 
of the petals, naked and subsessile. The anthers are surmounted 
by a stipitate gland. The styles unite into a short column capi- 
tate and stigmatiferous at apex. Acmadenia consists of Adenandre, 
whose petals have a barbate or ciliate claw ; and if their anthers are 
surmounted by a gland, it is sessile. Agathosma, with the petals of 
Acmadenia, has styles forming by their union an elongated column 
whose stigmatiferous apex does not dilate into a lobed head. 
Barosma has petals with a short giabrous claw, and the style of 
Agathosma; but the flowers are axillary and not terminal, as in 
all the preceding genera. The true Diosme are now only consi- 
dered as plants whose flower is that of an Adenandra, as to the 
conformation of the gynæceum, but having only five fertile sta- 
mens, alternating with the petals. There is also an isostemonous 
character in Luchetis and Macrosfylis. Both have unguiculate petals, 
transversely barbate ; but the former has the short capitate style of 
Adenandra or Diosma, and the latter the elongated non-thickened 
apex of Barosma or Agathosma, with the terminal inflorescence of 
the latter. 
This series also contains some exceptional types : Zmpleurum, with 
tetramerous, apetalous, moncecious flowers, and a gynæceum reduced 


1 Tauns., F/, Cap., ii. 126 (Diosma). —Hanrv. & Son. Fl. Cap. i. 377.—Bot. Mag. 
t. 23382.—Watr, Ann., vii. 511. 
2 White or pink; small. 
