Cl. 13.] RUTACE^E. 157 



genuine plants of this Order, the latter being sepa- 

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

 because the Capsule is supposed to have only 3 valves, 

 and 1 cell, instead of 5 or 10 ceils and valves. But 

 H. thymlfollum has really 3 cells, and the habit of 

 the plants scarcely warrants such a separation. Heli- 

 anthemum is inadmissible as a name, being the same 

 in meaning as Hdianthus. 



The following genera are supposed related to the 

 Cisti, 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 Aubl., now referred by Schreber, 

 Gen. 827, to Turnera ; 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 

 Turnera, more akin to Jussieu's Ficoidca:, Ord. 87, 

 than to the Cisti. 



Ord. 8 1 . RUTACEJE. " Calyx of 1 leaf, often in 

 5 deep segments. Petals mostly 5, alternate therewith. 

 Stamens definite, distinct, mostly ten, alternately op- 

 posite 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, hi 

 a fleshy Albumen. Stem herbaceous, or shrubby, 

 rarely arboreous. Leaves in some alternate, naked ; 



