50 BOTANICAL 3IA0AZINE. [Voi. xvn. 



texture. Umbel usually large, coropound or simple, 6-32 cm. long, 11-46 cm. 

 across ; - radii 5-12, erect-patent, unequal in length, straight, slender, com- 

 pressed, smooth, the longest one 23 cm. ; the basal sheatli 1-4 cm. long, 

 with a terminal subulate lobe ; involucral bracts 3-5, much longer than the 

 umbel, broadly linear, long- acuminate, clas})ing at the base, aculeato-scabrous 

 on the margin and carina, the lowest one attaining 11 decim. in length ; 

 secondary umbel pluri-radiate with erect-patent or divaricate unequal radioles 

 which attain about 7 cm. in length, the basal sheath truncate at the mouth 

 and brown ; bracts hnear, long-acuminate, usually shorter than the secondary 

 umbel, aculeato-scabrous on the margin throughout and carina above. 

 Spikes 1-7, radiately placed, in the lateral ones erect-patent or patent or 

 subreflexed and shorter than the terminal one, sessile, elliptic il to oblong, 

 2-4 cm. long, 1-lf cm. broad, subdistichously spiculose; rachis slender, narrowly 

 winged, glabrous. Spiculfe numerous, patent, sessile, approximate, oblong- 

 linear, obtuse, complanate, flavescent but viridescent towards the edges, about 

 24-30-flowered, 7-10 mm. long ; bracteoles minute, subulate, acuminate ; 

 rachilla glabrous, very narrowly winged. Glumes numerous, distichous, 

 imbricate, erect-patent, oval- orbicular, navicular, subcarinate, rounded and 

 with a mucronate point at the apex, very minutely erosulate on the 

 margin, membranaceous and flavescent, obscurely 5-nerved and broadly 

 gTeen (excepting the lower portion) on the back, 2 mm. long ; the lowest 

 glume shorter, oval, 2-carinate, truncato-retuse at the apex. Stamens 

 3 ; filament ligulate, glabrous, as long as the style ; anther linear, pale- 

 yellow, apiculate at the apex. Style exserted from the glume, slender, 

 ligulato-filiform, compressed, glabrous, slightly thickish towards the base, 

 3-fid ; the branches filiform, i as long as the main portion. Caryopsis 

 elliptical, trigonous, smooth, 1 mm. long, pale-stramineous, with sub-per- 

 sistent style which is longer than the caryopsis. 



Hah. Prov. Musashi : Tokyo {T. Mahino ! Oct. 1890, Oct. 1893, Sept. 

 1895). 



The largest species among the Japanese Cyperus, and is occasionally 

 found growing in pond or ditch in Tokyo. 1 have named this species in 

 honour of Kwanyen Iwasaki, the author of well-known ^^ Honzo-Dzufu '' 

 (J^WM^), a great work on Japanese plants. 



It is abundantly cultivated in boggy field as a useful plant in Corea, 

 where a sort of floor mat is made of its culms, according to T. Uchiyama, 

 of the Botanic Garden, Science College, Imperial University of Tokyo, 

 who travelled over that country under the order of the University for the 

 collection of plants in 1902. (^o he continued.) 



