DEC. 1911.] MAKINO.— OBSERV. ON THE FLORA OF JAPAN. 255 



confluent below, short, globose, or depressed-globose, erect, 

 sessile, dark-fuloYOUS, not smooth and more or less leproso- 

 verrucose ; mouth broad, few-several-lobate ; lobes erect, unequal 

 in size, usually deltoid or depressed-deltoid, obtuse or acutish 

 at the apex, thin towards the margin. Stem simple, thick, 

 straight, terete or subcompressed-terete, smooth on surface, 

 covered with scales and scarcely visible superficially, pale but 

 often very slightly rosy. Scales opposite in 5 or 6 pairs, 

 imbricated, decussate above, concave internally, rounded-convex 

 externally, thick but thin towards the margin, entire and not 

 ciliated, rounded-obtuse at the apex, smooth, more or less 

 shining, cream-pale when fresh, but the basal one often thinly 

 bay-coloured, rather firm in texture, erect-patent but erect in 

 the basal ones, the superior ones larger and the lower ones 

 gradually diminished in size, longitudinally many-nerved, with- 

 out transverse-veinlets between nerves (nerves simple, parallel, 

 not close, invisible superficially) ; the basal ones semiorbicular 

 or ovato-semiorbicular ; the middle ones oval-ovate ; the superi- 

 or ones broadly ovate. 



A genus'of only one species, which is 



Mitrastemon (sphalmate Mitrastemma) Yamamotoi 

 Makino, sp. nov. 1. c. 



Characters as in the genus. 



Plant 2J-5§cm. in height. Yolva about 7-lOmm. long, 

 9^11mm. across. Stem about 6-7mm. across. Scales : the 

 basal ones about 4-9mm. long, 7-lOmm. wide ; the middle ones 

 about 10-15mm. long, 12-15mm. wide ; and the superior ones 

 about 18-20mm. long, 16-17mm. wide. Flower about 



15-20mm. long. Perigone about 5-8mm. long, 6-llmm. in 

 diameter. Stamen about 14-20mm. long, 5-9mm. across. 

 Anther 4-5mm. long; connective-tip 2-3mm. long. Ovary 

 5-llmm. long and across. Style 2-3mm. long, 5-7mm. across 

 in the lower portion ; stigma 3-4Jmm. long, 4-6mm. across. 

 Seed about Jmm. long. Flowers in November. 



Nom. Jap. Yakko-so (T. Makino). 



Hab. Prov. Osumi in Kiusiu : Tashiro-go (Yasusada Ta- 

 shiro ! about 1882) ; Prov. Tosa in Shikoku : Hata-gori 



