MB. G. BENTIIAM ON BIXACE.E AND 8AMYDACE.E. 77 



ovules of Cistineae, the five erect introrse anthers, connivent or 

 connate in a ring round the ovary of Violaceae, the axile placenta- 

 tion and valvate sepals of Tiliaceae, and among Calycinora? the 

 corona of Passifloraceae (which include Malesherbid) . ' 



With regard to the distribution of the genera of Bixaceae into 

 tribes, the most recent, founded on a general survey of the Order, 

 is that proposed by Clos in the above-mentioned memoir in the 

 ' Annales des Sciences Naturelles ;' for Harvey's and Grisebach'a 

 are partial only, based the one upon the Cape genera, the other 

 on the West Indian ones. Clos proposes five tribes — Flacourtiese, 

 Azareae, Laetieae, Bixeae, and Pangieae. The last of these, Pan- 

 gieae, is well marked by the scales at the base of the petals, and i3 

 by some considered as constituting a distinct Order. The Azarea? 

 consist chiefly of JBanara, Kuhlia, and Pineda — all decidedly peri- 

 gynous, and which we propose, as above mentioned, to remove, as 

 one genus, to Samydaceae. Aznra itself is, however, hypogynous 

 or nearly so, and appears to us to be much nearer allied to Scolo- 

 pia, and to belong to the ti'ibe of Flacourtiese, in which we would 

 include Laetieae rather as a subtribe than as a distinct tribe. On 

 the other hand, as we propose bringing CocMospermum and Amth 

 reuxia next to JBixa, we would distinguish the Bixeae by the pecu- 

 liar anthers and some other characters common to these genera 

 only, and separate from them Oncoba, Mayna and their allies into 

 a distinct tribe, which we would name Oncobeae. 



The following would then be our arrangement of the Order : — 



Tribus I. Bixe,e. Flores hermaphroditi v. rarius polygami. Petala 

 ampla, esquamata, contorta. Antherae apice biporosae v. bre- 

 viter bivalves. Endocarpium membranaceum, solubile. 



Genera: — 1. Cochlospermum, Kunth. 2. Amoreuxia, Moc. et 

 Sess. 3. Bixa, Linn. 



Tribus II. Oncobe.e. Flores dioici v. polygami. Sepala et petala 

 valde imbricata, haoc majora esquamata. Antherae lineares, 

 birimosae. 



Genera:— 4. Oncoba, Forsk. 5. Mayna, Anil. (Lindackeria, 

 Presl.) 6. Carpotroche, EndL 7. Dendrostylis, Karst. et Triana. 



Tribus III. Flacoubtie.e. Flores hermaphroditi v. dioici. Petala 

 v. sepalis parum majora, imbricata, esquamata. Antherae 

 birimosae, breves v. rarius (in flore apetalo) lineares. 



