23 



Cypei'us luteolus Boeck. in Flora LVIII. (1875) p. 82, ex Benth. I. c. 



Cyperus tosaensis Makino in Bot. Mag., Tokyo, VI. (1892) p. 47, 

 (nomen). 



Hab. Prov. Tosa in Isl. Shikoku : Kashiratsudoi (T. 3IaJcino\ Oct. 27, 

 1885). 



It is rarely found in the warm part of Southern Japan. 



Cyperus (Choristachys, Coinpressi) Iwasakii Makino in Bot. Mag., 

 Tokyo, VI. (1892) p. 47. 



Estoloniferous, glabrous, attaining about 12 decim. in height. Boots 

 fibrous, dark-castaneous. Culm solitary, or 2-3, robust, elate, nearly 

 2 cm. in diameter at the basal portion, obtusely trigonous, smooth, green. 

 Leaves basal, 3-4, longer than the culm, long, broadly linear, long-acumi- 

 nate, aculeato-scabrous on the margin and carhia, subcoriaceous, about 

 6-14 nun. wide, green above, paler beneath, the sheath long and spongy in 

 texture. Umbel usually large, compound 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 sheath |-4 cm. long, 

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

 umbel, broadly linear, long-acuminate, clasping 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, elliptical to oblong, 

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

 winged, glabrous. Spicule 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 naiTOwly 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 

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

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



