POSITION OF THE GENERA HYDROCOTYLE, ETC. 291 
2. O. Japonica, Seem.—Rhaphiolepis Japonica, Sieb. et Zucc. Fl. Jap. 
t. 85.—Japan and Bonin. 
3. O. integerrima, Seem. —Rhaphiolepis integerrima, Hook. et Arn. 
Bot. Beech. p. 263.—Bonin. 
4.0. spiralis, Seem.—Mespilus, Blume. Rhaphiolepis, G. Don.— 
Java. ! 
5. O. Mertensii, Seem.—Rhaphiolepis, Sieb. et Zucc: l. c.—Japan. 
III. Commra, Lour. 
This genus has been correetly referred to Euphorbiacee, but even the 
latest writers on that Order, including Baillon (Etud. Euphorb., Paris, 
1858), do not know what to make of it. Loureiro’s two authentie 
specimens at the British Museum prove it to be Exceecaria Agallocha, 
a common seaside tree in the tropics of the Old World. The leaves 
are sometimes quite entire (the greater number are so in Loureiro’s 
specimens), but they are more generally serrate. The apparent struc- 
tural difference between Commia and Escæcaria resolves itself into 
errors of description on Loureiro’s part. 
IV. Buastus, Lour. 
This genus, omitted by De Candolle, Endlicher, and Lindley, is a 
genuine Melastomacea, unfortunately also overlooked by Naudin. The 
authentic specimens at the British Museum show it to be allied to 
Aplectrum, Bl. non Nutt. (Anplectrum, A. Gray), but differing in 
habit, in having a dehiscent capsule, not a berry, and only four stamens. 
Loureiro describes only one species, B. Cochinchinensis, which is iden- 
tical with Bentham’s Anplectrum parviflorum, from Hongkong, For- 
mosa, and Assam. 
Blastus Cochinchinensis, Lour. Fl. Cochinch. ; fruticosa ; ramis tere- 
tibus, dichotomis; foliis longe petiolatis, elliptico-oblongis, longe acu- 
utrinque ramulis pedicellis 
abris; cymis axillaribus, 
limbo 4-dentato ; petalis 
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neatis, angulatis.—Anplectrum parviflorum, j 
—Southem China (Loureiro / in Mus. Brit); Hongkong (Wright ! in 
Her b. Hook.), Formosa (Wilford ! in Herb. Hook.), Assam (Masters / 
in Herb. Hook.). 
