208 HYDEOCHARIDE.E. 



O. Konisliii. According to Mr. T. KAWAKAMI, the trunk is nearly fifty feet 

 tall, and about four feet in girth. 



Hydroeharidese. 

 Blyxa THOU. 



Blyxa (Diplosiphon) ecaudata HAYATA sp. nov. (Fig. 77, c-f.) Planta in 

 aqua immersa acaulis. Folia omnia radicalia fasciculatim disposita lanceolata 

 circ. 6 cm. longa 4 mm. lata apice acuminata vel acuminatissima basi requilata 

 haud attenuata tenuissime membranacea. Scapi erecti apice uniflorati floribus 

 exceptis 1-2 cm. longi, cum floribus circ. 10 cm. longi folia superantes. Spatha 

 ad apicem scapi sita fructifera cylindracea 3 cm. longa If mm. lata apice atten- 

 uata breviter 2-lobata basi obtusa fructus perfecte 

 includens et eum superans glabra utroque latere 

 tenuiter costata. Flores apertientes ignoti. Flores 

 post anthesin vel fractiferi : calycis tubo (ovario 

 excepto) circ. 4 cm. longo circ. 1 mm. lato, lobis 3 

 linearibus 5 mm. longis mm. latis apice obtusis. 

 Petala 3 ? post anthesin evanescentia. Fructus 

 lineari-cylindricus quam spatha brevior 2-2 cm. 

 longus 1 \ rnm. latus, testa tenuiter membranacea 

 haud costata. Semina ellipsoidea 1mm. longa vel 

 longiora latere uno costata paucissime muricata, 

 testa Crustacea, albumen copiosum. 



HAB. Hokuto, leg. Y. SHIMADA, Oct. 1915 (No. 

 16, a). 



Near Blyxa ceratosperma MAX.; but differs 

 from it by the much narrower fruits with the less 

 muricate seeds. 



Blyxa (Diplosiphon) laevissima HAYATA sp. 

 nov. (Fig. 77, a and b). Herba aquatica, caulis 15- 

 20 cm. longus 1 mm. latus tenuissimus. Folia alter- 

 na linearia circ. 3 cm. longa 1 J mm. lata apice 

 acuminatissima 1-nervia basi sessilia haud contracta 



Fig. 77; a, a flower of 

 Blyxa Icecissima HAYATA x 3; 

 b, a seed of the same species 

 X 1 5 ; c, and d, seeds of Blyxa 

 ecaudata HAYATA, seen from 

 different sides X 15 ; e, the 

 same, seed coat taken off X 15 ; 

 f, albumen, detached from the 

 same seed X 15 ; g, a seed of 

 Blyxa Shimadai HAYATA x 15. 



