126 ON SOTJTH-AMEEICAN APOCnSTACE^. 



Benth. (Gen. ii. 728) do the same. Swartz and Andrews's plant, the Neriandra suberecta 

 of A. DC. is here referred to my genus Chariomma (see p. 111). 



Species excluded : — 



Urechites Jcegeri, Miill. Linn. xxx. 442 = Laseguea Jcsgeri. 



TJ. Domingensis, Mull. I. c. 447 Chariomma Doming 



U. barbata, Miill. I. c. 447 Mhabdadenia ba/rbata 



TJ. Neriandra, Griseb. M. Br. W. Ind. p. 415 . . Chariomma surrecta. 



Odontadenia. 



A genus established by Mr. Bentham in 1841 *, who placed it in the tribe Plumeriem ; 

 he did not find ripe seeds in the fruit examined by him. Prof. De Candolle arranged 

 the genus in the TaberneemontanecB, between Bonafovsia and Feschiera t. Dr. Miiller 

 located it in the Echitece, next to Anisolobus %, but afterwards he made it a section of 

 Taberncemontana §. It must, however, be placed in a very different position, on account 

 of its long anatropus seeds, which have neither a pulpy funicle nor a coma. A distin- 

 guishing feature among its many peculiar floral characters is the disk, which is conically 

 cylindrical, fleshy, divided halfway into 5 erect lobes, which are again cleft into 2 to 5 

 obtuse teeth. The fruit consists of 2 (or more often, by abortion, 1 only) oblong, 

 stoutish follicles, containing each about 100 long, terete seeds, without any apical coma, 

 imbricatively erect, attached by a small basal hilum to 2 septiform membranaceous 

 placentas extending halfway across the cell. The embryo is encased in a thin corneous 

 albumen, has 2 linear narrow cotyledons with a terete radicle one tenth of their length, 

 which points to the basal hOum. 



As several heterogeneous species have been recorded which ought to be excluded, I 

 wiU. here enumerate only those which legitimately belong to the genus. 



1. Odontadenia speciosa, Benth. Hook. Joum. Bot. iii. 240; Miill. (in parte) Fl. Bras. t. c. p. 117; 

 A. DC. Prodr. viii. 360. In Guiana : v. s. in hb. Mm. Brit. Berbice (Schomb. 309) . 



A handsome species, with stoutish terete branches with axils 2-2|^ in. apart ; leaves 

 oblong-lanceolate, subacute towards the base, gradually narrowing above acuminately, 

 margins undulated, subrevolute, chartaceous, dark green above, quite glabrous, patently 

 spreading, with about 16 pairs of fine yellow nerves running straight to the margin, 

 hepatic brownish beneath, opake, with an elevated striolate midrib and prominent 

 nerves with obsolete ' veins, 6 in. (or more) long, 2-2J in. broad, on rather slender 

 channelled petioles 5-6 lines long; panicles axfllary or terminal; pedicels 6-8 lines 

 long; sepals 4 lines long, spreading, obtusely broad, with waving membranaceous 

 margins; corolla 2 in, long; tube IJ in. long, ventricose at the base for 4 lines 

 below the constriction, broadly campanulate above, glabrous ; segments oblong, spread- 



* Hook. Joum. Bot. iii. 242. f Prodi', viii. 359. 



t Mart, Flor. Bras. faso. xxvi. 116. § Linn. xxx. 402. 



