Araceae 



259 



lateral ones slightly smaller, usually decurrent on one side at 

 base; scape 3-10 cm. long; peduncle 2-5 cm. long; spathe dark 

 purple, without auricles, the blade oblong, scarcely nar- 

 rowed at base, 8-13 cm. long, arching over the spadix and 

 pendulous at tip, acuminate; spadix-appendage thick, clavate- 



cylindric, thickened below and truncate at base. May. 



Kyushu. 



10. Arisaema robustum (Engl.) Nakai. A. amurense 

 Maxim, var. robustum Engl.; A. amurense, sensu auct. Japon., 



non Maxim.; A. sadoense Nakai Hiro-ha-tennan-sh6, Sado- 



TENNAN-SHO. Pseudostcm 20-35 cm. long, from a depressed- 

 globose tuber bearing small tubers on the sides; leaf solitary, the 

 petiole terete, nearly erect, 10-25 cm. long, the blade palmately 

 5-foliolate, the rachis not developed, the leaflets obovate or ovate, 

 10-15 cm. long, 4-7 cm. wide, abrupdy short-acuminate; 

 peduncle 2-5 cm. long; spathe green with longitudinal white 

 stripes or dark purple (forma atropurpureum T. Koyama), 

 somewhat auriculate on the upper margin of the tube, the 

 blade ovate, 5-6 cm. long, long-acuminate, obliquely ascend- 

 ing, scarcely narrowed at base; spadix-appendage cylindric, 

 thickened and truncate at base. May-June. Woods; Hok- 

 kaido, Honshu, Kyushu. Korea and Sakhalin. 



Arisaema hakonecola Nakai. Kamiyama-tennan-sho, is 

 poorly known and may be the same as A. robustum, differing 

 allegedly in the larger spathe with a uniformly dark purple 

 blade arching over the spadix, and a very stout appendage of 

 the spadix. Honshu (Hakone). 



11. Arisaema ovale Nakai. Ashu-tennan-sho. Tuber 

 subdepressed-globose, 3-5 cm. across; scalelike leaves 3, tuni- 

 cate; normal leaf solitary, the petiole thick, about 20 cm. 

 long, 5-10 mm. in diameter, the leaflets 5, pedate or nearly 

 palmate, oblong to broadly ovate-ellipdc, entire, 10-15 cm. 

 long, 3-6 cm. wide; peduncle very short; spathe 5-6 cm. long, 

 dark purple with longitudinal white stripes, auricled on the 

 upper margins of the tube, the blade ovate, 8-10 cm. long, 

 strongly arching over the spadix; spadLx-appendage whitish, 

 clavate-cylindric, stout, 4-6 cm. long, longitudinally rugose, 



on a short stipe 5-8 mm. long. Honshu (Tanba, Omi, 



Echizen, Etchu, Noto, and elsewhere). 



12. Arisaema izuense Nakai. Izu-tennan-sho. Leaf- 

 lets to 17, obovate, to 8 cm. long, 3.5-4 cm. wide, abruptly 

 short-acuminate; spathe dark purple, without stripes, the 

 blade deltoid-ovate, gradually tapering to apex, scarcely 

 auricled on the upper margins of the long cylindrical tube; 

 spadix-appendage prominently thickened at tip; otherwise 



with the characters of A. ovale Nakai. Honshu (Izu 



Penin.). 



13. Arisaema suwoense Nakai. Yamaguchi-tennan- 

 SHO. Resembles the preceding; tuber rather small, about 15 

 mm. across; leaf solitary, the petiole terete, about 20 cm. long; 

 leaflets 7-9, oblong to obovate-oblong, abruptly acuminate, 

 cuneate at base, the terminal one 10-12 cm. long, 4-5 cm. 

 wide; peduncle about 20 cm. long; spathe purplish, the 

 auricles rather narrow, the blade 12-14 cm. long, oblong-ovate, 

 abrupdy long-acuminate, strongly declined over the spadix, the 

 spadix-appendage stout, cylindric-clavate, slightly thickened 

 at apex, truncate at base, about 8 mm. in diameter at apex. 

 May. Honshu (Suwo). 



14. Arisaema simense Nakai. Shlma-mamushigusa. 

 Tuber depressed-globose, without lateral tubers; leaf soli- 

 tary, the petiole terete, about 10 cm. long, leaflets 7-13, lanceo- 

 late to broadly so, acuminate, the terminal one 6-20 cm. long, 



about 3 cm. wide; spathe pale green, the upper margins of 

 the tube slightly recurved, the blade abrupdy narrowed from 

 a deltoid base to a long linear tip, erect, 6-8 cm. long; spadix- 

 appendage narrowly cylindric, terete, not thickened at apex. 

 ■ -Honshu (Kinki Distr.), Kyushu. 



15. Arisaema yoshiokae Nakai. Inugatake-tennan-sho. 

 Resembles the preceding; pseudostem about 50 cm. long; leaf 

 solitary, the petiole terete, about 10 cm. long; leaflets 15-19, 

 oblong to lanceolate, the terminal one 12-16 cm. long, 2-5 

 cm. wide; peduncle 2-5 cm. long; spathe greenish, the margin 

 of the tube scarcely recurved, the blade bent forward, ovate- 

 lanceolate, gradually long taillike at apex, papillose on the 

 margin; spadix-appendage slender, about 2 mm. in diameter, 

 the base thickened to about 5 mm., truncate. May. Kyu- 

 shu (Inugatake in Buzen Prov.). 



16. Arisaema iyoanum Makino. Omogo-tennan-sho. 

 Tuber depressed-globose, bearing a few small additional tubers; 

 leaf solitary, long-petioled; leaflets 9-11, lanceolate, long-acumi- 

 nate, cuneate at base; spathe light green to purplish, the blade 

 l-'i cm. long, linear-ovate, gradually acuminate, broadened at 

 base, the upper margin of the tubular part recurved; spadix- 

 appendage narrowly cylindric, rounded at apex, somewhat 



thickened and truncate at base. Shikoku (Omogokei in 



lyoProv.). 



17. Arisaema seppikoense Kitam. Seppiko-tennan-sho. 

 Tuber depressed-globose; pseudostem 17-25 cm. long, purple- 

 spotted; normal leaf solitary, long-petioled, pedately 7- to 

 9-foliolate; leaflets oblong-lanceolate, acuminate, narrowed to- 

 ward base, sparsely puberulent beneath, the terminal one 

 17-23 cm. long, 4-5 cm. wide; peduncle short; spathe dark 

 purplish, the mbe 4-4.5 cm. long, dark purple, the blade ovate- 

 lanceolate, 7-8.5 cm. long, about 2.5 cm. wide, dark purple 

 with 4 white longitudinal stripes, long-acuminate; spadix- 

 appendage purplish, rounded at tip, 2-4 mm. in diameter. 



May. Honshu (Harima Prov.). 



18. Arisaema akiense Nakai. Aki-tennan-sho. Tuber 

 depressed-globose, covered with the fibrous remains of old 

 sheaths, scalelike leaves 4, the outer 2 whitish, the others light 

 brown or greenish; normal leaf solitary, the petiole terete, 

 about 25 cm. long including the sheath; leaflets 7, rather 

 loosely pedate, lanceolate-oblong, 6-13 cm. long, 2-3.5 cm. 

 wide, acuminate, acute at base, undulate on margin; peduncle 

 shorter tiian the leaf; spathe large, the tube to 4 cm. long, 

 about 10 mm. across, with longitudinal whitish purplish 

 stripes above the middle, the mouth ampliate, the blade longer 

 than the tube, oblong-lanceolate, subabruptly acute, purple- 

 brown, bent down and arching over the spadix, recurved on 

 margin; spadix-appendage cylindric-clavate, whitish but pur- 

 plish at base. May. Honshu (Aki Prov.). 



19. Arisaema monophyllum Nakai var. monophyllum. 



A. akltense Nakai Hitotsuba-tennan-sho, Akita-tennan- 



SHO. Tuber depressed-globose; pseudostem 20-80 cm. long; 

 leaf solitary, die petiole terete, 7-15 cm. long; leaflets 7-11, ovate 

 to oblong, sometimes obovate, abruptly cuneate-acuminate at tip, 

 entire (forma integrum Nakai) or serrulate (forma serrula- 

 tum Nakai), the terminal one as large as or sometimes slightly 

 smaller than the next lateral ones, 10-20 cm. long, 3-7 cm. 

 wide; peduncle 3-10 cm. long at anthesis, later elongating; 

 spathe light green, marked with a dark purple transverse 

 band inside, the upper margins of the tube scarcely recurved, 

 the blade deltoid-lanceolate, 5-6 cm. long, gradually long- 

 acuminate, erect or slightly oblique, in part dark purple; 



