1903.] OBSERVATIONS ON THE FLORA OF JAPAN. 149 



5 decim. in height. Stems slender, terete, glabrous, nodose ; nodes turged 

 and glabrous ; internodes short, shorter than the leaves. Leaves lanceolate 

 or narrowly lanceolate, acuminate, attenuated below into the petiole, mem- 

 branaceous, minutely pellucid-punctate under lens, glabrous, but often 

 antrorsely minutely spinuloso-ciliated on the margin and often adpressed- 

 scarbro-hirsute on the midrib beneath, attaining about 5cm. long, 1cm. 

 broad ; midrib slender ; veins many, delicate, erect-patent ; petiole gracile, 

 glabrous, attaining about 8mm. long ; sheath short, usually slightly shorter 

 than the petiole, attaining 8mm. long, glabrous, but setoso-ciliated, thinly 

 membranaeous, loosely nerved. Spike angustate, erect or more or less 

 nutant, laxly flowered, but interruptedly flowered and leafy at the base ; 

 rachis filiform ; bracts short, vaginate, truncate, loosely ciliated, mem- 

 branaceous above, li-2mm. long. Flowers 2-5-fasciculate, pedicellate, 

 small, li-2mm. long, white then often rosy, greenish below ; pedicel 

 shorter than the flowers. Perianth campanulate, 4-5-cleft, pellucid- 

 punctate ; segments oblong, obtuse. Stamens 6, included ; anther white. 

 Pistil slightly lower than the stamens ; ovary elliptical, compressed ; styles 

 2, connate below, scarcely shorter than the ovary ; stigma capitate. Akene 

 enclosed in the persistent viridescent perianth, subovato-elliptical, biconvex, 

 nigro-castaneous, very minutely rugulose, limm. long. 



Hah. Prov. Musashi : Tokyo, cult. {T. Mahino ! 1888, 1903) ; Prov. 

 Kadzusa : Ichinomiya (R. Yatabe and J. llatsumicra I herb. Sc. Coll. 

 Imp. Univ. Tokyo, Sept. 1880); Prov. Mutsu : Hirosaki {T. Itvakaiva I 

 herb. ibid. Aug. 19, 1880) ; Prov. Uzen : Tsurugaoka (T. Nagasaiva ! 

 Aug. 27, 1893). 



Cultivated for the acrid leaves. It differs from the type by the 

 fastigiately much ramose and densely leaved habit, the leaves and flowers 

 are also smaller, and the akene smaller and narrower. 



forma angustissimum. 



Small. Leaves angustato-linear or linear-filiform. 



Eab. Prov. Musashi : Tokyo, cult. (S. Furuhmoa ! Oct. 1903). 



Only cultivated. 



Polyongum (Echinocaulon) sagittatum Linn. «. sibiricum Meisn. in 

 DC. Prodr. XIV. p. 132 ; Herd, in Act. Hort. Petrop. XL p. 254. 



Polygonum sagittatum Linn. Sp. PI. p. 363, Cod. n. 2871 ; Thunb. 

 Fl. Jap. p. 167, ex parte. 



Polygonum sagittatum a. boreale Meisn. Monogr. Polygon, p. 65 ; 

 Ledeb. Fl. Boss. III. p. 529. 



