20«) 



XATURAL HISTORY OF PLANTS. 



this the petals, shorter, tliicker and more angular, give the bud a 

 pyramidal form. Finally, there is in this genus a plant which, with 

 the same general lloral organization as in U. OUveriaua, has a gamo- 

 petalous corolla which falls in a single piece. It was called Hexa- 

 lobiis Lrnsiliensis,^ and was afterwards brought near Trifjijneia properly 

 so called. It is certainly to Unona what those species of Uvaria, 

 whose petals are united at the base, are to that genus. 



Thus formed by the union of a large number of genera kept 

 separate by the most recent authors, the genus TJnona contains 

 about eighty species from tropical regions of both hemispheres, of 

 which only about one-tenth belong to America.^ They are trees 

 or shrubs, sometimes creepers, almost always glabrous, with alternate 

 exstipulate leaves, and flowers solitary or grouped into few-flowered 

 cymes, axillary, extra-axillary, leaf-opposed or terminal. From the 

 preceding description we see that we may very well describe Unona 

 as Uvaria with a valvate corolla, and hence those species of Uvaria, 

 Ammina, and Ancana, in which three petals are valvate at a certain 

 period, form a passage between the two genera, which could not be 

 placed in tribes separated by impassable limits."* 



Anaivagorect is the name given to certain plants with the flowers 

 of certain PoJj/altJiias or Kentias, but whose fruit is a one- or two- 

 seeded follicle. The calyx consists of three membranous or valvate 

 sepals, free, or cohering below, spreading or reflexed on the expan- 

 sion of the flower. The petals are valvate, of very variable thickness 

 according to the species, and the inner ones are as large as the outer 

 ones, or smaller.^ The receptacle, more or less convex, then bears a 



' A. S. H. & TUL., Ann. Sc. Nat., ser. 2, 

 xvii. 133, t. G.— Trif/i/neia B. H., Gen., 24, n. 

 11 ; 25, n. 15. Except for its united petals this 

 species comes very near our Unona Oliveriana, 

 (see p. 203, note 5). 



2 1. Unonaria (DC.) (Pseudo- 



Unona HooK. & TiiOMS.). 



2. Desmos (LouH.). 



3. Da.iymaschalon (HoOK. & 



'I'lTOMS.). 



4. Ancana (F. MriCLL.). 



5. Meiogyne (MiQ.). 



6. Trivalvaria (MiQ.). 



7. Ctinaiiffium (Cananr/a RuM- 

 I'H., nee Afbl.). 



8. I'yramidanlhe (MiQ.). 



9. Melodorttm (Bl.). 

 ' 10. Unonastnim (H. Bn.). 



Unona . 

 Sections 15. 



\ 



Unona,CGni(\. 

 Sections 15. 



rll. Ti'igyneia (Schitl.). 



12. Kentia (Bl.) {MitrellaMiq.). 



13. Folyalthia (Bl.). 



14. Monoon (Miq.). 

 1 15. Monocarpia (MiQ.). 



"• The sections Trlgyneia and Unonastrum 

 (see pp. 203,205). 



■• On this subject, see Adansonia, viii. 309. 



5 A. S. H., £utl. Soc. Fhilomat. (1825), 

 91.— Bl., Fl. Jav., Anonac, 64, t. 32.— A. 

 DC, Mem., 35. — Endl., Gen., n 4719. — A. 

 Gray, Amer. JExpl. JExped., i. 27. — B. H., Gen., 

 25, 957, n. 18. — H, Bn., Adansonia, viii. 328, 

 338. — MJwpalocarpus Teism. & Bixkend., ex 

 Miq., Ann. Mus. Lugd. Bat., ii. 22, t. 2 (nee 

 Boj.). 



^ The outer petals are sometimes membranous 

 like the sepals, as is seen in A.prinoides A. S. H. 



