MELASTOMACEZ, 435 
Costa Rica (Endres, 261); Panama, Lion-Hill railway-station and Rio Grande 
station (S. Hayes, 365, 474).—Cupa. Hb. Kew. 
MELASTOMACEA DUBIEA. 
1. Melastoma umbilicata, Bert. Fl. Guat. p. 16. 
GuaTEMALA, Esquintla (Velasquez). 
2. Melastoma rostrata, Bert. Fl. Guat. p. 17. 
GuaTEMALA, Antigua (Velasquez). 
Order LVI. LYTHRACE. 
Lythracee, Benth. et Hook. Gen. Plant. i. p. 773; Koehne, Fl. Bras. fasc. xxiii. 
About 250 species of herbs, shrubs, and trees, belonging to thirty genera. The woody 
species are mostly natives of tropical and subtropical regions, and the herbaceous 
species generally dispersed, a few of them having a very wide range of distribution in 
temperate regions. | 
Tribe AMMANNIEA. 
Dwarf herbs, often aquatic. 
1. ROTALA. 
Rotala, Linn. Mant. p. 175; Benth. et Hook. Gen. Plant. 1. p. 776, sub Ammannia; Koehne, FI. 
Bras. fasc. lxxii. p. 191. 
Several herbaceous species, diffused nearly all over the tropics. Aquatic or marsh 
plants. 
1. Rotala mexicana, Ch. et Schl. in Linnea, v. p. 567, 
Koehne (J. ¢.) unites under this name several varieties, widely spread in Tropical Asia, 
Africa, and America (see t. 39). | 
‘‘ Planta nobis ex descriptione auctorum verisimiliter ex ordine excludenda est. An 
Caryophyllee ?”—-Benth. et Hook. Gen. Pl. i. p. T76. 
2. Rotala ramosior, Koehne, FI. Bras. fasc. Ixxiii. p. 194. 
Ammannia ramosior, Linn. 
Ammannia catholica, Ch. et Schl. 
Ammannia occidentalis, DC. 
Nort AMERICA.—SoUTH Mex1co, in wet places near El Estero (Schiede.& Deppe).— 
West Inpies and Brazit and in the Puinippine Istanps. Hb. Kew. | 
2. AMMANNIA. 
Ammannia, Linn. Gen. Plant. n. 155; Benth. et Hook. Gen. Plant. i. p. 776. 
Bentham estimates the number of species, including Kotala, at thirty, generally dis- 
persed in the tropics. They are aquatic or marsh plants. 3h 
3k 2 
