52 NATURAL HISTORY OF PLANTS. 



calyx witli five deep divisions imbricated in the bud/ and five alter- 

 nate petals whose prtefloration is contorted or imbricated. The 

 andi'oceum is formed of ten stamens, superposed five to the divisions 

 of the calyx and five shorter to the petals, in one species from 



Soiimin arenarium. 



Fig. 88. Flowcr-bcaring and fruit-bearing branch. 



tropical Western Africa, U. ffabonensis, of which we had at first made 

 the type of a particular genus under the name oîAuhrya? The stamens 

 are all fertile and free or united to a variable height by the base of 

 the filaments, and they have a bilocular iutrorse anther, whose cells 

 each dehiscing by a longitudinal cleft are ajiplied below and within 

 to a thick connective conical and flattened, whose summit much 

 surpasses them in height.'' In certain American species which have 



209 ; in Payer Frim. Nat. 262. — Myrodendron 

 ScHREB. Gun. 358 (ind. : Anhrya H. Bn. HeUcria 

 Nees et Mart. HaccoyloUis Mart. Vanlanea 

 AnBL. rrt«<a«coJ(/«s Rich. WarnisecHa^cov^. 



' So much smaller as they are more exterior 

 in priefloration. In Viintaiieoides of Richard (H. 

 Bn. in Adaiisonia, x. 369), the sepals are imbri- 

 cated ; but in the true Vataneas, as V. guianensis 



AuRL. the teeth of the calyx do not even touch 

 each other. 



= H. Bn. in Admimmn, ii. 2G2 ; x. 368.— B. 

 H. Gen. 988, n. 2. «.— Oliv. Fl. Trop. Afr. 1. 

 276. — Walp. Ann. vii. 464. 



3 H. MoHL (in Ann. Sc. Nat. ser. 2, iii. 335) 

 describes the pollen as : " ovoid ; three folds ; in 

 these are the papillœ ; in water sjiherical, trian- 



