126 ON SOUTH-AMERICAN APOCYNACEZ. 
Benth. (Gen. ii. 728) do the same. Swartz and Andrews’s plant, the Veriandra suberecta 
of A. DC. is here referred to my genus Chariomma (see p. 111). 
Species excluded :— 3 
Urechites Jegeri, Müll. Linn. xxx. 442. . . . .= Laseguea Jegeri. 
.U. Domingensis, Müll. l.c.447 . . . . . . . Chariomma Domingensis. 
U. barbata, Müll. l c. 447 . . ena . . . Rhabdadenia barbata. 
U. Neriandra, Griseb. Fl. Br. W. seg p- 415 . .  Chariomma surrecta. 
ODONTADENIA. 
A genus established by Mr. Bentham in 1841 *, who placed it in the tribe Plumeriee ; 
he did not find ripe seeds in the fruit examined by him. Prof. De Candolle arranged 
the genus in the Zabernemontanee, between Bonafousia and Peschiera t. Dr. Müller 
located it in the Echitea, next to Anisolobus Ï, but afterwards he made it a section of 
Tabernemontana $. 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 hilum. 
As several heterogeneous species have been recorded which ought to be excluded, 1 
will here enumerate only those which legitimately belong to the genus. 
1. ODONTADENIA speciosa, Benth. Hook. Journ. Bot. iii. 240; Müll. (in parte) Fl. Bras. £. c. p. 117; 
A. DC. Prodr. viii. 360. In Guiana: v. s. in hb. Mus. Brit. Berbice (Schomb. 309). 
A handsome species, with stoutish terete branches with axils 2-21 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, 2-21 in. broad, on rather slender 
channelled petioles 5-6 lines long; panicles axillary or terminal; pedicels 6-8 lines 
long; sepals 4 lines long, spreading, obtusely broad, with waving membranaceous 
margins; corolla 2 in. long; tube 14 in. long, ventricose at the base for 4 lines 
below the constriction, broadly campanulate above, glabrous; segments oblong, spread- 
* Hook. Journ. Bot. iii. 249, f Prodr. viii. 359. 
t Mart, Flor. Bras. fasc. xxvi. 116. $ Linn. xxx. 402, 
