59 



This inhabits the middle and northern parts of Japan. The colour 

 of the whole plant, the leaves of 5 -segments, and the turioniferous corm, are 

 the principal characters separating this from Arisa'ma scrrafum Scliott and 

 A. Japom'cum Blume. 



Arisaema (Pedatisecta) Sazensoo (Buerg.) Makino nora. nov. 



About 3-6i decim. in height. Corm depressed- globose. Oataphylls 

 thinly membranaceous, the superior one tubular below, lanceolate above. 

 Leaves 2, the lower one larger, long-petioled, pedatisected with 5-segments, 

 but with 3-3egments in the insufficiently grown one, semicircular in the 

 outline; segments ovato-oblong, obovate-oblong, obovato-elHptical, obovato-oval, 

 broadly oval, or broadly ovate, shortly acuminate or cuspidate-acuminate, or 

 sometimes mucronate, cuneate and at length decuiTent towards the base, but 

 the outermost one often obtuse at the base, entire {forma a. integri folium), or 

 irregularly or erosely denticulato- serrate or dentate-serrate or coarsely dentate 

 (^forma h. serratum), often albido-maculate along the midrib in the upper 

 surface ; the middle segment usually largest, equal at the base, furnished with 

 a petiolule ^-2 cm. long, or rarely subsessile, 2-15i cm. wide, 6-26 cm. long 

 including the petiolule ; lateral segments more or less unequal at bases, the 

 outermost one smallest in size; veins about 8-16 on each side, erect-patent, 

 straight or more or less arcuate and connected with the intramarginal 

 vein ; veinlets finely anastomosing, not conspicuous superficially ; petiole 

 cylindrically long-vaginate, obliquely or straightly truncate at the mouth, 

 the up[)er free portion slender, 7-1.5 cm. long in the superior one and 8- 

 18 cm. long in the inferior one. Peduncle usually lower than leaves, the 

 upper naked portion 2-10 cm. in length. Spathe erect ; the tube convolute 

 and tubuloso-infundibuliform, thickly membranaceous, dark-purple, 4-6 cm. 

 long, the mouth truncate and spreading with entire and whitish margins ; 

 the limb a little forniculate-incurved and then erect above, longer than the 

 tube, obovato-oblong to oblong-lanceolate, gradually attenuated above and 

 narrowly acuminate ; entire, dark-purple externally and whitish internally, 

 thickly membranaceous, longitudinally veined, 10-18 cm. long, 3-5i cm. 

 broad. Spadix unisexual, subconico-cylindrical, subsessile, many-flowered, 

 li-3 cm. long ; the appendage exceeding the spathe-tube, erect, shortly 

 stipitate, subtruncate at the base, cylindrical below, large and globoso-clavate 

 above and white, 3-6^ cm. long including the stipe. Male flowers minute, 

 rather laxly disposed, shortly stipitate, 2-4-androus. Female flowers dense- 



