306 
At.liance VII. LOGANIALES. 
Essenttai. Character. — Flowers unsymraetrical. Stame7is never 2, usually more 
numerous ; often more than the segments of the corolla. Leaves always opposite. 
Order CCXXIV. LOGANIACE.E. 
Loganie^, R. Brown in Flinders, (1814) ; Von Martins N. Gen. et Sp. PI. 2. 133. (1828) ; 
Bartl. Ord. Nat. 205 (1830) ; Arnott in Edinb. Encycl. 120. (1832). 
Essential Character. — Calyx inferior, 5-parted. Corolla regular or irregular, with 
convolute aestivation. Stamens arising from the corolla, all placed upon the same line, 5 
or 1, therefore not always symmetrical with the divisions of the corolla ; pollen with 3 
bands. Ovary superior, 2-celled ; style continuous ; stigma simple. Fruit either capsular 
and 2-celled with placentae finally becoming loose; or drupaceous, with 1- or 2-seeded 
stones. Seeds peltate, with a finely reticulated integument, sometimes winged ; albumen 
fleshy or cartilaginous ; embryo with the radicle turned towards the hilum. — Shrubs, her- 
baceous plants, or trees. Leaves opposite, entire, usually with stipules which are combined 
in the form of interpetiolary sheaths. Flowers racemose, corymbose, or solitary. 
Affinities. It is not clear, from the remarks upon Logania by Brown 
in his Prodromus, whether he intended to establish this order or not. He 
states that he has placed Logania at the end of Gentianacese, on account of 
some affinity between it and Exacum and Mitrasacme, and also because it does 
not answer ill to the artificial character of that order ; adding that it, however, 
might have a still closer connexion with Apocynacese and with Usteria 
among Cinchonacese. He further points out the close relation of Genios- 
toma to Logania, and concludes by inquiring whether those 2 genera do not, 
with Anasser, Fagrsea, and Usteria, form an order intermediate between Apo- 
cynacese and Cinchonacese. This view has been adopted by Von Martins, with 
the exception of Fagrsea, which he places among his Potahacese ; he founds 
the distinction of the order upon the want of symmetry between the parts of 
the calyx, corolla, and stamens, upon the aestivation of the corolla being con- 
volute, not contorted, and in the presence of stipules combined in interpetio- 
lary sheaths. Mr. Arnott remarks to me (letter, Dec. 1835.) that the order 
may be in some respects looked upon as consisting of Cinchonaceae with supe- 
rior fruit. 
Geography. Found in tropical India and Africa, and in the temperate 
parts of New Holland. 
Properties. Unknown, 
GENERA. 
Logania, R. Br. Geniostoma, Forst. Usteria, Lam. Gaertnera, Lam. 
Euosma, Andr. Anasser, Juss. Fagraa, Thunb. Andersonia, W. hrb. 
? Gardneria, Wall. Willughbeia, Scop. Pagamea, Aubl. 
Order CCXXV. POTALIACE^E. 
Brawn in Tuckey, 449 (1819). Potaliea:, Martins N. G. et Sp. 2. 91. and 133. (1828) ; 
Royle Illustr. 269. (1835). 
Essential Character. — Calyx inferior, with 4, 5, or 6 partitions. Corolla regular, 
with from 5 to 10 divisions, which are therefore not symmetrical with the segments of the 
calyx ; the aestivation contorted, convolute. Stamens arising from the corolla, all upon 
the same line; pollen simple, elliptical. Ovary superior; style continuous; stigma simple. 
