206 



XATrilAL JflSTOUY OF PLAXT^ 



tliis tlie petals, shorter, tliickcr and more ani^'ular, p^ive the hud a 

 pyramidal form. Finally, there is in this <>:enus a plant wliich, with 

 the same general floral ori^anization as in I'. Olireriana, has a gamo- 

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

 lobits brasilieiifiis,^ and was afterwards brought near Trif/t/iwia 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 hirge number of genera kept 

 separate by the most recent authors, the genus Unona 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 Uraria, 

 Jsimina, 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.' 



Ana.ragorea'' is the name given to certain plants with the flowers 

 of certain Poli/alfltias 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 retlexed 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.it Tri... Aun. Sc. Kat., s.'r. 2, 

 xvii. i:i3, t. G. — Tiir/i/neia li. H., G('n.,2l, ii. 

 11 ; 25, n. 15. Except for its iiiiiti'd petals this 

 Hpeeies conies very near our ('nana Oliveriana, 

 ((WO p. 2u:j, note 5). 



" .1. Unonaria (DC.) (Pseudo- 



Unona HuoK. &T110MS.). 



2. iJetmoM (l.ovH.). 



3. Jhmi^maM'halon (HooK. L 



TllDMts.). 



I. Anrana (K. MUELL.), 

 i'notin. ' 5. Mriof/t/iie (M\ii.). 

 Sections 15. (>. Triialraria {M\q.). 



7. C'tintiiii/lum {('anaiii/ti iJlM- 

 I'li., n«i- At iil). 



8. Pyrnmidanllif (,Mly.). 

 J). Alrlodunim (IJl..). 



1(». Unonimtruni (H. I5\.). 



?7/io;irt,contd 

 Sections 15. 



rll. Tr'uftfni'ia (Schlti..). 



12. Keliiia (lii..){ MUrelh MiQ.). 



13. I'olyalthin (Ul.). 



14. Munoon (.Mig.). 



15. Motiocarpia (MlQ.). 



' The seitiona 2'rii/ifneia and I'noiuistrum 

 (see pp. 203,205). 



* Un this subject, see Adaimonla, viii. 309. 



* A. S. n.. Bull. Soc. Philomat. (lS2o), 

 91.— Hi.., Fl. Jav., Anonac, 61. t. 32.— A. 

 DC, Mrm., 35.— Kndl., (Sen., n JTltJ.— A. 

 GuAV, Amer. Kx}d. A'xy^rc/., i. 27.— H. II., den., 

 25, U57, n. IH.— H. li.N'., Adanwnia, viii. 328, 

 338. — Hhupaloctii-pua Tkihm. & Hi.NXKNV., cx 

 Mlg., Ann. Mtis. Luqd. liat., ii. 22, t. 2 (nee 



n...i.). 



" The outer petals are soniotinioH ujcnihrunous 

 hke the HepaK us is ston in A.prinuidet A, S. H. 



