RUB I ACE ^. 305 



Zanzibar, unites this series also with that of the Coffeece, for it has 

 the flower of a Coffee, sometimes with five, sometimes with six or 

 seven parts. But its ovule is descending with a neighbouring 

 thickening of the umbilic, like that of Canthium, and its inflorescences 

 are those of Nematoatylis, 



Knoxia, of which a separate tribe (Knoxiece) has been made, has 

 two cells with ovule of Canth'min, a valvate corolla, a dicoccous fruit 

 and terminal cymes. The columella is wanting in those named 

 Pentanisia and the style is undivided. They are herbs of the old 

 world, especially abundant in tropical Africa. The calyx is of 4, 5 

 unequal divisions, short dentiform or, in Pentanisia, in part elongate 

 and even foliaceous. The stamens are sometimes dimorphous, longer 

 usually and exserted in the male flowers, whilst the anthers may be 

 sessile in the female flowers. 



The genus Synisoon is exceptional in this series inasmuch as each 

 of its ovarian cells encloses two parallel descending ovules instead of 

 one ; both are attached to a thickened part of the funicle. The cells 

 are five in number. The only species known, from British Guyana, 

 is a woody plant with opposite leaves and inflorescences in terminal 

 cymes. The tubular calyx divides lengthwise on one side; the corolla 

 is contorted, and its five stamens have a dorsifixed and apiculate 

 anther. The style is terminated by a stigmatiferous bowl with five 

 slightly marked lobes. 



YIII. GENIPA SEKIES. 



TouKNEFORT made known in 1700,^ according to Plumier,^ the 

 first Genipa studied by European botanists, G. americana (fig. 296). 

 It is a fine tree with opposite leaves accompanied by intrapetiolar 

 stipules, the hermaphrodite flowers of which have an inferior ovary of 

 two complete or incomplete cells with numerous ovules, surmounted 

 by an epigynous cupuHform disk and a thick, lance-pointed style 

 traversed by two longitudinal furrows and bearing on its surface a 

 trace of the impression of the more exterior organs. Its calyx is 



» Inst. 658, t. 436, 437. Rub. 164, t. 12, u. 2.— DC. Prodr. iv. 378.— 



' Czt. 20 (1703).— L. Gen. (ed. 1) n. 930.— J. Spach, Suit, a Buffon, viii. 408.— Endl. Gen. n. 



Goi. 201 ; Mim. Mus. vi. 391.— Lamk. Diet. ii. 3306.— B. H. Gen. ii. 90, n. 168. 



629; Suppl. ii. 707; III. t. 158, fig. 2.— Rich. 



VOL. VII. X 



