358 FLORA OF SOUTH AMERICA. 



the order itself for its separation from Cyrtandracea have 

 been entirely broken down by Mr. Brown, so that there is 

 now scarcely any order which is more in want of a complete 

 revision. My materials do not suffice for undertaking the 

 task on the present occasion ; but as I have found it ne- 

 cessary to add several genera, either here or in the Planta 

 Hartwegiance, to those already described, an enumeration of 

 the American genera hitherto known may not be out ot 

 place. 



Tribe I. Gesnerie^e. — Calyx ovario plus minus adnatus. 



* Calyx nudus, ovario toto adnatus. 



Calycis limbus 5-partitus. — Rytidophyllum and Conradia, 

 which require considerable revision as to their respective 

 limitation and distinction, and probably the separation of 

 some species. 



Calycis limbus tubulosus, semi-5-fidus. — Solenophora. 

 ** Calyx nudus. Ovarium apice liberum, conicum v. ovatum. 



To this group belong four genera, Gesneria, Gloxinia, 

 Achimenes and Diastema, all numerous in species, the greater 

 number of which may be distributed among the four by the 

 following characters. 



Gesneria. Corolla (coccinea aurantiaca v. rarius alba) basi 

 subaequalis, tubulosa v. tubuloso-campanulata ; limbo nunc 

 (Sect. Corytholoma) bilabiato, labio superiore erecto, inferiore 

 trilobo patente, nunc (Sect. Isoloma) 5-partito, lobis brevibus 

 latis subaequalibus. Glandulae 3 v. 5. 



Gloxinia. Corolla (ccerulea violacea albido-rosea v. stra- 

 minea) basi postice gibba, ample tubuloso-campanulata, limbo 

 5-lobo erecto-patente. Glandulse 3 v. 5. 



Achimenes. Corolla (versicolor) basi postice gibba v. cal- 

 carata, (rarius subaequalis ?) tubo declinato superne amphato, 

 limbo plano-patente 5-fido. Annulus hypogynus integer. 



Diastema.* Corolla basi aequalis v. postice gibba, tubo 



• This is the genus to which Pceppig and Endticher have given the name 

 of Trevirana, on the supposition that it would include the Cyrilla pulchella, 



