HYDROCHARroE^. ORCHIDE.E. 



Hydrocharideee. 



Hydrocharis LINK. 

 Hydrocharis asiatica MIQ. 

 HAB. Koslmn (Herb. Taihoku). 



Orchideae. 

 Oberowia LINDL. 



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

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



6 cm. longis dense approximating, foliatis, partibus floriferis pendulis filiformibns 



7 cm. longis, parti- 

 bus inter earn 

 floriferam et earn 

 foliatam 2-3 cm. 

 longis squamiferis, 

 squamis lanceolatis 

 acuminatis 2 mm. 

 longis. Folia alterna 

 disticlia approxi- 

 mata in exsiccato 

 coriacea in vivo 

 crassiuscula im- 

 bricata semi-ob- 

 longa equitantia 



late re COmpressa seen from front; i-k, Oberonia kusutotsensis HAYATA; i, a lip; j, a 

 plan a 142 cm column, seen from front; k, the same, seen from side. 



longa 5 mm. lata apice obtusa vel ad summum apiculata basi ad vaginam 

 abeuntia liaud articulata, margine inferiore recta, margine superiore ~~-formiter 

 recurva, vaginis se imbricatis. Spicse 7 cm. longse, rhachibus filiformibus, 

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

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

 margine obscure erosis, pedicellis cum ovariis 1 mm. longis. Sepalum 

 posticum oblongum 1 mm. longum f mm. latum sursum concavum versus 



Fig. 3, a, b, c, d, e, h, Oberonia arisaiienftis HAYATA ; a, a dorsal 

 sepal ; h, a lateral sepal ; c, a petal ; d, a lip ; e, a column ; b, a 

 pollinium ; f , g, Oberonia fvrmosana HAYATA ; g, a lip ; f , a column, 



