Araceae 257 



15A. Spathe-blade oblong-ovate, abruptly long-acuminate, strongly declined over the spadix; spadix-appendage cylin- 



dric-clavate, slightly thickened at apex 13. A. siiwoense 



15B. Spathe-blade deltoid, abruptly narrowed from the top of the tubular part, erect, the apex gradually elongate to 



a linear tip; spadix-appendage narrowly cylindric, terete 14. A. simense 



lOB. Spadix-appendage thickened at both ends or at least at base, the median and sometimes the apical part narrow, 1-2 mm. 

 thick; spathe-blade broadly deltoid-lanceolate to narrowly deltoid-ovate, 2-3 cm. wide; leaflets 7-19. 



16A. Spathe entirely green, papillose on margin 15. A. yoshiokflc 



16B. Spathe usually purplish, entire. 

 17A. Spathe-blade 7-10 cm. long. 



18A. Leaflets 9-11; spathe-blade linear, ovate, gradually acuminate 16. A. iyoanum 



18B. Leaflets 7-9. 



19A. Spathe-blade ovate-lanceolate, long-acuminate, dark purple with 4 white stripes; Honshu (Harima Prov.). 



17. A. seppikpense 



19B. Spathe-blade oblong-lanceolate, subabruptly acute, light purple-brown; Aki 18. /i. akjense 



17B. Spathe-blade 3-6 cm. long. 



20A. Spathe-blade, at least in part, dark purple, 5-6 cm. long, deltoid-lanceolate 19. A. monophyllum 



20B. Spathe-blade greenish, ovate, 3-4 cm. long 20. A. maximowiczii 



B. Normal leaves 2, rarely 1 in depauperate individuals. 



21A. Leaflets 3-5; spathe-blade abruptly long-acuminate; spadix-appendage capitately thickened at apex. . . . 21. A. si/^ok,'anuin 

 21B. Leaflets (5-)7-17; spadix-appendage cylindric, slender or clavately thickened at apex. 

 22A. Spathe-blade filiform-elongate. 



23A. Spadix-appendage thick-cylindric; spathe-blade dark purple with vertical white stripes 22. A. \ishidae 



23B. SpadLx -appendage clavate, thickened at apex; spathe-blade green 23. A. tosaense 



22B. Spathe-blade acuminate to long-acuminate, not filiform-elongate. 



24A. Spathe-blade broadly lanceolate, gradually long-acuminate; spadix-appendage slenderly cylindric. 



25A. Spathe-blade bent forward horizontally 24. A. longilaminuni 



25B. Spathe-blade declined and arching over the spadix. 



26A. Spadix-appendage erect 25. A. anguslijoUatum 



26B. Spadix-appendage slightly bent forward 26. A. shinanoense 



24B. Spathe-blade narrowly to broadly ovate. 



27A. Spathe-blade densely yellowish papillose inside 27. A. yamatense 



27B. Spathe-blade smooth inside. 



28A. Spathe-blade obliquely ascending or bent horizontally, subabruptly short-acute. 



29A. Plant loosely tufted with numerous young plants; spathe-blade oval to orbicular-ovate 28. A. prolijerum 



29B. Plant solitary; spathe-blade ovate. 



30A. Spadix-appendage thick-clavate 29. A. speirophyllum 



30B. Spadix-appendage linear or cylindric 30. A. petiinsiilae 



28B. Spathe-blade declined above, long-acuminate. 



31A. Spathe-blade oblong-deltoid, tapering from base; appendage of spadix cylindric, the apex as broad as the 

 other part. 

 32A. Spadix-appendage slenderly cylindric or linear. 



33A. Spadix-appendage linear; spathe-blade obliquely declined only at tip; leaflets 9-18, often serrulate; Hon- 

 shu 31.^/. angiistatum 



33B. Spadix-appendage cylindric; spathe-blade declined; leaflets 1 1-13 in the lower one, entire; Kyushu. 



32. A. kpshil^iense 

 32B. Spadix-appendage cylindric, rather thick, to 8 mm. across at base; tubular part of spathe rather long. 



33. A. solenochlamys 

 31B. Spathe-blade broadly ovate to ovate-lanceolate, tapering from below the middle but not from base. 

 34A. Leaflets palmate on the scarcely developed rachis; scape longer than the leaves. 



35A. Leaflets 5 i^. A. nililiocnsc 



35B. Leaflets more than 5. 



36A. Leaflets 5-7, not variegated, narrowly oblong; entire or serrate; auricles of spathe very distinct. 



35. A. slcnophylUim 

 36B. Leaflets 8-14, with a broad white line along the midrib, linear-lanceolate, always undulate on margin; 



auricles of spathe narrow and rather inconspicuous 36. A. iindulatijolium 



34B. Leaflets pedate on the well-developed rachis at least between the lower ones. 



37A. Spathe-blade broadly deltoid-ovate, the rachis of leaflets spirally curved on apical part, the auricles al- 

 most wanting 37. -•/. tak.edae 



37B. Spathe-blade narrower, gradually tapering toward both ends from the middle, the auricles developed. 



38A. Auricles of spathe very broad; Kanto to Oshima in Izu Prov 38. A. Umbatum 



38B. Auricles of spathe narrow. 



39A. Spadix-appendage bulbously thickened at apex, smooth or rugose. 



40A. Spathe-blade elongate, nearly as long as the tubular part, spreading nearly at right angle over the 



mouth; Kyushu 19. A. maycbarac 



40B. Spathe-blade always shorter than the tubular part, strongly declined at tip over the mouth; east- 

 ern Honshu 40. A. scrratum 



39B. Spadix-appendage slightly or scarcely thickened, smooth. 



41A. Tuber globose, not depressed; Izu Islands 41. A. hachijoense 



41 B. Tuber depressed-globose; western Honshu 42. /f. japonicum 



