117 



Observations on the Flora of Japan. 



{^Continued from p. 116.) 



By 



T. Makino, 



Assistant in the Botanical Institute, Science 

 College, Imperial University of Tokyo. 



Polygonum (Echinocaulon) breviochreatum Maldni^, sp. nov. 



Polygonum muricatum Maxim, in litt. non Meisn. 



Annual; attaining 6 decim. long. Stem slender, weak, erect from the 

 decumbent or often radicant base, branched at the base ; the internodes 

 longer or shorter than the leaves, smooth but retrorsely loosely pilose on 

 the opposite side to the leaves above. Leaves distant, patent, shortly 

 petioled, oblong-lanceolate or lanceolate, acuminate, subsagittato-truncate 

 r subcordate at the base, thinly pilose above, glabrous but loosely antrorsely 

 pilose on the midrib beneath, antrorsely minutely scabro-ciliated on the 

 margin, membranaceous, attaining about 8cm. long, 2cm. broad ; lateral 

 veins subnumerous, delicate, erect-patent, arcuate ; petiole glabrous, 3-1 5mm. 

 long ; sheath shorter than or equal to the petiole, ciliated, adpressed-hirsute 

 externally. Peduncles terminal or axillary, loosely placed, slender, filiform, 

 patently glanduloso-hispid ; bracts subulate, acute, entire, thinly pilose, about 

 2mm. long. Spike short, laxly often interruptedly few-ilowered. Flower 

 very shortly pedicellate, 4mm. long, pale-rose ; pedicel usually shorter than 

 the bracteoles ; bracteoles elliptical, acutish, scarious on both edges, laxly 

 glanduloso-hispid on the carina above. Perianth 5-cleft ; segments ellip- 

 tical, obtuse. Stamens 7, included ; filaments unequal in length. Ovary 

 ovoid ; styles 3, very short, scarcely connate at the very base ; stigma 

 capitate. Akene enclosed in the perianth, ovoid-globose, with an acute 

 triangular short tip, smooth, shining, fiilvo-castaneous, with persistent styles 



2 1 mm. across. 



Rah, Prov. Tosa : Sakawa (T. MaUno ! 1884), Idzunia {T, Makino ! 

 Oct. 17, 1892); Prov. Yamato : Nara {K, Tsuzil Oct. 1902). 



This differs from Polygonum mu7^icatuni Meisn., by the narrow leaves 



and the ovoid-globose akene. 



Polygonum (Echinocaulon) auriculatum Makino, sp. nov. non Meisn. 

 Annual, bay-ferruginous when dried. Stem long and slender, decum- 



