210 HYDROCHARIDE^E. 



lineares 2i mm. longi apice obtusi glabri. Fructus cylindrico-linearis 3 cm. 

 longus 1J-2 mm. latus apice ad tubuni calycis abeuns basi obtusus nralti-sper- 

 miis, testa menibranacea. Semina ellipsoiclea 1^ mm. longa mm. lata breve 

 echinata utraque extremitate cauclis instructa, cauclis If mm. longis, testa 

 crnstacea, albumen copiosum. 



HAB. Taihoku: Koteisho, Hokuto, leg. Y. SHIMADA, Juli. 1915 (No. 16, a et b). 



Near Blyxa echinosperma CLARKE, but differs from that in having three 

 petals in a single flower. 



Blyxa (Diplosiphon) Somai HAYATA sp. nov. Herba acjuatica acaulis basi 

 radices fibrosas profuse emittens. Folia fasciculatim disposita omnia radicalia 

 linearia 30-40 cm. longa circ. 7 mm. lata apice acmninatissiina basi hand 

 attenuata hand contracta. Scapi uniflorati longissimi flore excepto circ. 25 cm. 

 longi gracillimi cum floribus circ. 45 cm. longi folia in longitudine supe- 

 rans. Spatha nna ad apicem scapi sita norem singulum includens, fructifera 

 cylindrica 4-5 cm. longa 2i mm. lata apice attenuata 2-lobata basi obtusa utro- 

 rjue latere tenuiter costata menibranacea. Flores apertientes baud visi. Flores 

 post anthesin fructiferi : calycis tubus ovario excepto 8 cm. longus filiformis 

 1 mm. latus, lobis linearibus 6 mm. longis f mm. latis apice obtusis. Petala 

 post anthesin evanescentia linearia. Stamina 3 lobis calycis breviora, filamentia 

 rlliformibus 2 mm. longis, antheris linearibus 2 mm. longis. Styli 3 basi ad 

 | coaliti, partibus liberis 4 mm. longis linearibus apice obtuso-acutis. Fructus 

 cylindricus 5 cm. longus 2 mm. latus, testa tenuissinie menibrauacea. Semina 

 ellipsoidea li mm. longa ad utramque extremitatem caudis instructa, caudis 

 1^-2 mm. longis. 



HAB. Hokuto, leg. H. INABA, 1911, Aug.; ibidem, leg. T. SOMA, Feb. 1915. 



Very near Blyxa Shimadal, but differs from it by the far much longer 

 leaves and in the less echinate larger seeds. It may be a form of B. Shimadai 

 growing in a deeper water. 



Ottelia PEES. 



Ottelia alismoides PERS.; FORBES et HEMSL. Ind. Fl. Sin. III. p. 3. 



HAB. Uraisha, leg. S. SASAKI, Aug. 1910. 



Distrib. Tropical Asia, Japan and North Australia. Compared with a 

 Japanese specimen in the herbarium at Tokyo. 



