83 



and about licm. in diameter; racliis triquetrous with smooth edges, greeu, 

 straight ; bracts patent-reflexed, slenderly linear, gradually acuminate, trique- 

 trous towards the apex, scabrous-margined, delicately carinate beneath, not 

 vaginate, the lowest one largest and about 14 cm. long, the superior ones 



smaller; bracteoles setaceous, slightly longer or 

 shorter than spiculfe. Spiculte lato-lanceolate, at- 

 tenuatedly acuminate, acute at the base, compressed, 

 glabrous, pale fulvous, about 7 mm. long, with 1 

 perfect flower below and 1 very minute rudimentary 

 flower abov-e. Glumes deeply navicular, carinate 

 with a smooth and viridescent edge, membrana- 

 ceous, pale towards the base ; empt}' ones 4-6 

 oval-ovate, the lower ones gradually smaller and 

 shorter; flowering ones 2, much larger than empty 

 ones, the inferior one lato-ovate with an acute or 

 acutish tip, the superior one largest and ovate 

 with an obtuse tip, G-6^ ram. long. Setas G, 

 delicate, filiforni, smooth, irregularly fiexuous, 

 white, unequal in length, the longest one a little 

 exceeding the rostrum of the achene and about 

 5-5^ mm. long, the shortest one about equal to 

 the middle of the rostrum. Stamens 3, shghtly 

 exserted ; filament slender, filiform, glabrous, some- 

 what exceeding the rostrum of the matured 

 achene, about 6i mm. long. Achene rounded, 

 compressed, suddenly short-stipitate, very shortly 

 produced at the apex, with an obtuse margin, 

 transversely rugulose towards the centre of faces, 

 yellowish umber, 2 mm. and a little more in 

 length including the stipitate portion ; rostrum 

 slender, longer than the achene, but very much 

 narrower than it in width, gradually attenuated above, sessile and truncate 

 with a free edge at the base, compressed, viridescent. 

 Nom. Jap. Milcuri-gaya (nov.). 

 Hah. Prov. Mikawa : Futakawa {Z. Umcmura ! no. 90, Sept. 7, 1904). 



Isoetes japonica A. Br. Vide supra. 



Stock attaining 8 cm. in diameter. Caudex-lobes thick, deltoid, obtuse, 



