CI. 13.] RUTACEJE. 157 



genuine plants of this Order, the latter being sepa- 

 rated as a genus from Cistus, by Jussieu and others, 

 because the Capsule is supposed to have only 3 

 valves, and 1 cell, instead of 5 or 10 cells and valves. 

 But H. thymifolium has really 3 cells, and the habit 

 of the plants scarcely warrants such a separation. 

 Helianthemum is inadmissible as a name, being the 

 same in meaning as Hdianlhus. 



The following genera are supposed related to the 

 Gisti, as having a Capsule of 3 valves, into which the 

 Seeds are inserted ; but the number of their Stamens 

 is definite. Viola, whose affinity is one of the most 

 puzzling; Piriqueta A ubl., now referred by Schreber, 

 Gen. 827, to Turner a ; Piparea Aubl., of which too 

 little is known to afford matter for much conjecture; 

 and Tachibota of the same author (Salmasia Schreb. 

 201.) scarcely less obscure. Viola is perhaps, like 

 Tunwra, more akin to Jussieu's Ficoidece, Ord. 87, 

 than to the Cisti. 



Ord. 81. Rutace/e. "Calyx of 1 leaf, often in 

 5 deep segments. Petals mostly 5, alternate there- 

 with. Stamens definite, distinct, mostly ten, alter- 

 nately opposite to the Petals and Calyx. Germen 

 simple. Style 1. Stigma single, rarely divided. Fruit 

 of many cells, or many Capsules, usually 5, with one 

 or more Seeds attached to the inner angle. Embryo 

 flat, in a fleshy Albumen. Stem herbaceous, or 

 shrubby, rarely arboreous. Leaves in some alternate, 



