54 NATURAL HISTORY OF PLANTS. 
leaves alternate, fleshy, narrow, entire, ciliate, exstipulate ; flowers 
in axillary cymes, 3-bracteate ; sometimes in terminal racemose cymes 
(Tropical and West. Asia, Tropical and South Africa). See p. 29. 
Il. BARBEUIEZÆ. 
6. Barbeuia Dur.-Tn.—Flowers hermaphrodite regular; recep- 
tacle slightly convex. Sepals 5, imbricated. Stamens , hypo- 
gynous. Filaments free, inserted on annulus of receptacle; anthers 
2-locular, introrse, longitudinally 2-rimose. Germen superior, 
2-locular ; styles 2-partite ; lobes erect, thick, interior stigmatiferous ; 
one ovule in each cell, subbasilar amphitropous ; micropyle inferior 
lateral. Fruit, “capsular 2-lobed, 2-locular ; cells 1-spermous; seeds 
semi-arillate.’”’—Sarmentose glabrous shrubs; leaves alternate, entire 
petiolate, articulate at base. Flowers in short, rigidly compressed 
axillary racemes; pedicels alternate, apices swollen (Madagascar). See 
p. 30. 

Ill. AGDESTIDEZÆ. 
7. Agdestis Moc. anp Srss.—F lowers hermaphrodite, 4-merous ; 
receptacle obconical, concave. Sepals 4, inserted on the margin of re- 
ceptacle ; præfloration alternate imbricate. Stamens o (of Barbeuia), 
epigynous. Germen adnate to interior of receptacle 4-locular; cells 
opposite sepals; one ovule in each cell, subbasilar, ascending; 
micropyle exterior inferior ; style erect in column, apex 4-fid; lobes 
reflexed, stigmatiferous within. Fruit...2—A climbing shrub; leaves 
alternate, petiolate, cordate; flowers axillary, or arranged in terminal 
ramified racemose cymes ; pedicels 2-bracteolate (Mexico). See p. 32. 

IV. RIVINEÆ. 
8. Rivina PLrum.—Flowers regular, hermaphrodite ; receptacle 
conical, depressed. Sepals 4, imbricated, subpetaloid, finally vires- 
cent, persisting. Stamens either 4, alternisepalous, or 8—12 (4—8 in- 
terior) ; filaments free or connate at base, persistent ; anthers introrse, 
2-rimose. Germen 1-locular ; style eccentric, slender or insignificant, 
