MATERIALS FOR A FLORA OF FORMOSA. 309 
Monocotyledones. 
Hydrocharideee. 
Halophila. Tuov. 
Halophila ovalis Hoox. f.; Osrenretp, in Philip. Journ. Sci. 
IV. Suppl. p. 67. 
Has, Pratas, Jan. 1908, leg. T. Kawaxami. 
DISTRIB. 
This quite differs from Halophila ovata Gavpicu., though 
they are sometimes confounded on account of their bearing very 
similar names. JZ. ovata exists in Japan. 
Orchidee. 
Oberonia LINDL. 
Oberonia formosana Hayara sp. nov. Herba epiphytica, caespi- 
tosa, caulibus simplicibus vel rarius pauciramosis 3-5 cm. longis 
toto longitudine foliatis. Folia disticha sessilia alterna approxi- 
mata verticaliter compressa lineari-lanceolata 22 mm. longa 2% 
mm. lata apice aristato-acuta margine integra basi _latere 
inferiore recta superiore rotundata vaginosa caulem amplectantia 
erassiuscula. Spices terminales cum pedunculis 8 cm. longie 
cernue, floribus minutis 1 mm. in diametro, secus rachin inter- 
rupte fasciculatim dense sitis, bracteis ovato-acuminatis 1 mm. 
longis reflexo-patentibus. Sepala lateralia late ovata basi connata 
4 mm. longa totiusque lata obtuso-acuta patentissima posticum 
minus. Petala sepalo angustiora oblonga 3 mm. longa 4 mm. lata 
obtusa. Labellum sessile concavum rotundatum in circumscerip- 
tione 2 mm. longum totiusque latum 3-lobatam, lobo medio 
