H Y DROCHAEIDEJE . ORCHIDEJE. 



23 



Hydrocharidese. 



Hydrocharis LINN. 

 Hydrocharis asiatica MIQ. 

 HAB. Koslmii (Herb. Taihoku). 



Orchidese. 

 Oberonia LINDL. 



Oberonia arisanensis HAYATA sp. nov. (Fig. 3, a-e, and h.) Epiphyta 

 pendula. Caulis cum spicis 15 cm. longus ccespitosus, partibus foliatis inferioribus 

 G cm. loiigis dense approximatim foliatis, partibus floriferis pendulis filiformibus 

 7 cm. lougis, parti- 

 bus inter earn 

 floriferam et earn 

 foliatam 2-3 cm. 

 longis squamiferis, 

 squamis lauceolatis 

 acuminatis 2 mm. 

 1< mgis. Folia alterna 

 disticlia approxi- 

 inata in exsiccato 

 coriacea in vivo 

 crassinscula im- 



bricata semi-ob- Fig. 3, a, b, c, d, e, h, Oberonia arisanensis HAYATA; a, a dorsal 



lono-a equitantia se P a l; n > a lateral sepal; c, a petal; cl, a lip; e, a column; b, a 



pollinivtm ; f , g, Oberonia formosana HAYATA ; g, a lip ; f , a column, 

 late re Compressa seen from front; i-k, Oberonia kusukusensis HAYATA; i, a lip ; j, a 



1 1 9 r-m column, seen from front; k, the same, seen from side. 

 XIT i 



longa 5 mm. lata apice obtusa vel ad summmn apiculata basi ad vagiuam 

 abeimtia liaud articulata, margine inferiore recta, margine superiore formiter 

 recurva, vaginis se imbricatis. Spicae 7 cm. longee, rhacliibns filiformibus, 

 floribus verticillatim aggregatimque ad nodos sitis, nodiis a se 1-2 mm. 

 remotis, bracteis ovato-lanceolatis 1^ mm. longis | mm. latis apice acuminatis 

 margiue obscui-e erosis, pedicellis cum ovariis 1 mm. longis. Sepalum 

 posticum oblougum 1 mm. longum | mm. latum snrsum concavum versus 



