326 



Fig. 421. 



SYSTEMATIC BOTANY. 



Fig. 423. 



Fig. 425. 



Fig. 422. 



Fig. 424. 



Fig. 421. Corolla and stamens of Veronica. 



Fig. 422. Calyx and corolla of Antirrhinum. 



Fig. 423. Corolla, laid open, with didynamous stamens and staminode, of Scrophularia. 



Fig. 424. Diagram of flower of Scrophularia. 



Fig. 425. Didynamous stamens of Digitalis, 



ILLUSTRATIVE GENERA. 



This large Order exhibits considerable variety of conditions, whence its 

 affinities become somewhat complex. It is by Bentham and Hooker 

 divided into three Suborders or Series, thus : 



1. PSEUDOSOLANE^. Leaves alternate ; inflorescence centripetal, two pos- 



terior lobes of corolla outside. Verbascum, L. 



2. ANTIRRHINEJE. Leaves sometimes opposite ; irflorcscence centripetal. 



Corolla bilabiate, imbricate in (estivation, the posterior lobe outside the 

 anterior one. Calceolaria, Feuill. ; Linaria, L. ; Antirrhinum, L. ; 

 Scrophularia, L. ; Gratiola, L. 



3. RHINANTHEJS. ^Estivation imbricate, the two lateral lobes or one of 



them placed outside. Digitalis, L. ; Euphrasia, L. 



Affinity, &c. The near connexion with Solanacese, shown in the close 

 relationship between Salpialossis and Petunia, is mentioned also under 

 that Order, where a reference is made to the proposed transfer of the 

 Salpiglossida to the Order Atropacese of Miers. Mr. Bentham defines 

 the present Order by referring to Solanaceae the genera which have at 

 once 5 stamens and a corolla plaited in aestivation ; Petunia has a plaited 

 corolla and 5 stamens, which, however, are unequal and declinate, and 

 thus approach to Salpinlossis, where the corolla is very similar, but the 

 stamens truly didynamous. Verbascum. having 5 stamens, is sometimes 

 referred to Solanaceae ; but one at least of the stamens is commonly sterile, 

 and its corolla is imbricated. In another direction, Scrophularia cese 

 approach some of the forms of the very heterogeneous Loganiaceae ; and 

 Beutham regards it as advisable to refer Budctteia and its allies, generally 



