1604. J 



OBSEU VA TIONS ON 'HIE FLORA OF J A PA X. \ \ {) 



Scirpus (Silvaticaa) karuisawensis Makino sp. nov. (Photogr. 1.) 

 Perennial, attaining about lm. or more in height ; rhizome very short; 

 roots fibrous, dense, with many short lootlets. Leaves angustato-linear, 

 long-acuminate, triquetrous towards the acutish or subobtuse apex, glabrous, 

 but serrulato-scabrous on margin, rigid ; radical ones copious and densely 

 caespitose, shorter than the stem, finely striate below, clasping and evaginate 

 below ; cauline ones erect, remote, attaining about 5 mm. in width, ser- 

 rulato-scabrous on the midrib beneath, vaginate at base, the vagina attaining 

 7 cm. long and truncate at the mouth, the uppermost leaf exceeding the 

 panicle. Stem erect, straight, slender, attaining about 4mm. in diameter 

 at base, smooth, shining, subtrigono-terete with obtuse angles, nodes not 

 prominent. Cymes compound and forming an elliptical to ovate panicle 

 4-13 cm. long; the terminal cyme sessile; lateral peduncles (radii) few, 

 erect, unequal in length, the longest one about 8 cm., slender, glabrous, 

 the basal vagina tubular, obliquely truncate, attaining about l|cm. long; 

 involucral leaves 2-3, angustato-liuear, long-acuminate, the outer ones 

 longer than the panicle, erect or suberect, serrulato-scabrous on margin and 

 midrib beneath, the outer ones longer than the panicle, attaining about 

 19 cm. long ; pedicels setaceous, glabrous, erect- patent, unequal in length, few 

 to several in the lateral cymes but several to subnumcrous in the terminal 

 cyme ; bracts subulato-linear, setaceo-acuminate, scabrous on margin but 

 membranaceo-margined below, attaining about 3J cm. long. Spicuhe about 

 2-13-aggregate into a subsemispruerical head which is 5-10 mm. across and 

 shorter or longer than pedicels, brunneo-ferruginous, sessile, elliptico-obovoid, 

 acutish, 4-5 mm. long, 2^—3 mm. across; rachilla straight and stout; 

 bracteoles subulate, acuminate, membranaceous on margin, shorter than or 

 equal to heads in length. Glumes dense, imbricated, ovate, acuminate 

 with a sharp point, thinly membranaceous, ferruginous, minutely scabro- 

 spinulose on margin above, concave, subcarinate when dry, 2|-3 mm. long ; 

 midrib not stout, otherwise nerveless. Setae 6, ferruginous, flexuoso-corrugate 

 with two geniculate angles, filiform, scarcely enlarged and scabro-spinulose 

 above, about 4^ mm. long when lengthened. Stamens 2 ; filament lower 

 than the style, filiform, slightly wider above ; anther oblong-linear, acutish 

 at apex, about |-1 mm. long. Caryopsis obovoid, compressed-trigonous, 

 shortly attenuated at base, rounded-obtuse and with a gracile beak (style-base) 

 a little shorter than i caryopsis, stramineous, smooth, about \\ mm. long ; 

 style l§-2^ mm. long, deeply 3-fid, ferruginous except the subdilated base 

 which is stramineous and formed a bea k of the caryopsis ; arms setaceous, 

 |-lmm. long, minutely and obscurely scabrous. 



