Araceae 



261 



leaves; spathe-tube 5-9 cm. long, 15-25 mm. in diameter, 

 glaucous-green with longitudinal white stripes, shortly re- 

 curved on upper margins, the spathe-blade broadly ovate, 

 abruptly acuminate, dark green outside, dark green with 

 longitudinal white stripes inside; spadix-appendage clavate or 

 subobconical-cylindric, long-stipitate at base, longitudinally 

 many-furrowed toward base, rounded and smooth at apex. 



Honshu (Iwaki, Rikuchu Prov. and elsewhere). 



Arisaema boreale Nakai. Koshima-tennan-sho. Very 

 closely resembles A. speirophyllum and differs from it in the 

 smaller habit and smaller number of broadly elliptic leaflets. 

 • Hokkaido (Koshima in Oshima Prov.). 



30. Arisaema peninsulae Nakai. A. angustatum var. 



peninstdae Nakai ex Miyabe & Kudo K6rai-tennan-sh6. 



Tuber depressed-globose, 15-50 mm. in diameter; basal scale- 

 like leaves 3, membranous; normal leaves 2, the petioles as- 

 cending, 3-16 cm. long; leaflets 5-14, the median one on a 

 petiolule 1-4 cm. long, oblong, ovate, obovate, or elliptic, 

 acuminate, green (often white-variegated in forma variegatwn 

 T. Koyama); peduncle 6-20 cm. long; spathe green with 

 longitudinal white stripes, the tube about 5 cm. long, the 

 blade ovate, subabruptly narrowed toward apex, straight, 

 forwardly ascending; spadLx-appendage linear or cylindric, 



erect or slightly bent forward at apex. Hokkaido, Honshu, 



Kyushu (Tsushima) . Korea, and Manchuria. 



31. Arisaema angustatum Fr. & Sav. Hosoba-tennan- 

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

 leaves 2, the lower one larger, the petiole 5-15 cm. long; leaf- 

 lets 9-18, lanceolate, linear-lanceolate, or oblong, acuminate, 

 serrulate or entire (forma integrum Nakai) ; scape 5-15 cm. 

 long; spathe green or purplish above, upper margins of the 

 tube recurved, the blade deltoid-ovate, 5-7 cm. long, sub- 

 abrupdy acute, dp obliquely declined over the spadix; spadix- 

 appendage linear, rounded, about 2 mm. in diameter at apex, 



to 6 mm. in diameter at base. May-June. Honshu (Kanto 



and n. distr. on the Pacific side). 



32. Arisaema koshildense Nakai. Koshikijima-ten- 

 NAN-SHo. Tuber depressed-globose, about 4 cm. across; 

 pseudostem 20-40 cm. long; leaves 2, the lower one larger, 

 11- to I3-folio!ate, with an erect spreading petiole about 10 cm. 

 long, the upper one smaller, widi a petiole about 5 cm. long, 

 5- to 9-foliolate; leaflets narrowly oblong or narrowly lanceo- 

 late, entire; peduncle 6-17 cm. long, longer than the leaves; 

 spathe-tube 6-6.5 cm. long, 1-1.5 cm. in diameter, purplish, 

 with longitudinal pale stripes, the spathe blade broadly ovate 

 or deltoid-ovate, acuminate, declined over the spadix, purple 

 to dark purple with longitudinal white stripes, 3-5 cm. wide; 



spadix-appendage narrowly cylindric. Mar. Kyushu (Sat- 



suma, Osumi, Hizen Prov. and elsewhere). 



33. Arisaema solenochlamys Nakai ex F. Maekawa. 

 Yam,\ji-no-tennan-sh6. Differing from No. 28 in the 

 solitary not tufted stem without lateral young shoots, and 

 from No. 31 by the thick spadLx-appendage to 8 mm. across 

 at base and the tubular part of the spathe longer; resembles 

 also No. 32, but the leaflets usually minutely toothed on the 



margin. May-June. Honshu (Ugo, Shinano, Musashi, 



Shimotsuke Prov.). 



34. Arisaema nikkoense Nakai. Yumoto-mamushigusa, 

 Yam.-\gonnyaku. Tuber depressed-globose; pseudostem 15- 

 20 cm. long, to 1 cm. thick: leaves 2, the petioles 5-10 cm. 

 long; leaflets 5, nearly palmate, oblong to narrowly so, usually 

 dentate, acuminate, the terminal one 8-12 cm. long, 2-4 cm. 



wide; peduncle 10-20 cm. long, longer than the leaves; spathe- 

 tube ampliate above, upper margins slighdy recurved, the 

 spathe-blade ovate to narrowly so, 6-8 cm. long, declined over 

 the spadix, greenish or partly purplish; spadix-appendage 

 thick-cyllndric or clavate, slightly thickened at tip, truncate 



at base. May-July. Woods; Honshu (Kanto Distr.) 



Related to A. robustum. 



Arisaema alpestre Nakai. Takane-tennan-sho. Possibly 

 conspecific with A. niWoense, said to differ in the lanceolate, 

 entire leaflets and reddish to purplish scalelike basal leaves. 

 Honshu (Mount Yatsugatake). 



35. Arisaema stenophyllum Nakai & F. Maekawa. Ha- 

 uchiwa-tennan-sho. Tuber depressed-globose, 15-30 mm. 

 in diameter; basal scalelike leaves 4 or 5, crimson or light 

 purplish; normal leaves 2, palmate-pedate, 7-11 cm. long; leaf- 

 lets 5-7, narrowly oblong, entire or serrate, long-acuminate; 

 peduncles longer than the leaves; spathe with a cylindric tube 

 3.8-4 cm. long, with large auricles on the recurved upper mar- 

 gins of the tube, the blade bent forward and arching over 

 the spadix, elongate- to broadly ovate, acuminate, dark purple 

 with longimdinal white stripes; spadk-appendage thick, 

 clavate, whitish, or with purplish spots. May-June. Hon- 

 shu (Mount Hakone). Allied to A. limbatum. 



36. Arisaema undulatifolium Nakai. Nagaba-m<\mu- 

 SHiGusA. Tuber depressed-globose or hemispherical, some- 

 times with 1-3 small tuberlets; basal scalelike leaves 3; normal 

 leaves 2, palmate-pedate, the petiole terete, 3-10 cm. long; leaf- 

 lets 8-14, sometimes the middle one short-perioluled, linear- 

 lanceolate, 3-25 cm. long, 5-40 mm. wide, declined at apex in 

 vigorous specimens, with a broad white line along the midrib, 

 the margin prominently undulate, entire, or serrulate (forma 

 serntlatmn Nakai); peduncle longer than the leaves; spathe 

 with the tube 3^ cm. long, the blade ovate, bent down, 

 recurved on the upper margins, reddish or brownish purple 

 with longitudinal white stripes, auricles narrow, not promi- 

 nent. Apr. Honshu (Idzu). 



37. Arisaema takedae Makino. A. amplissimum, 

 sensu auct. Japon., non Bl. O-mamushigosa. Tuber de- 

 pressed-globose; pseudostem 20-80 cm. long; leaves 2, the 

 lower one larger, with a petiole 8-11 cm. long; leaflets 11-17, 

 arranged on 2 spirally curved rachises, ovate-oblong, the termi- 

 nal one 12-20 cm. long, 5-10 cm. wide; peduncle longer or 

 shorter than the petiole; spathe with the tube ampliate above, 

 recurved on upper margin, the blade large, broadly deltoid- 

 ovate, declined over the spadix, 8-12 cm. long, abruptly 

 acuminate, dark purple; spadix-appendage thick, cylindric, 

 rounded at apex, slightly wrinkled, 10-15 mm. in diameter, 



furrowed longitudinally in lower part, truncate at base. 



May-July. Hokkaido, Honshu (n. and centr. distr. as far 

 westw. as Kinki Distr.) . 



38. Arisaema limbatum Nakai & F. Maekawa. Mimi- 

 GATA-TENNAN-sHo. Tubcr depressed-globose; pseudostem 20- 

 60 cm. long; leaves 2, the petioles 7-20 cm. long; leaflets 7-11, 

 oblong to narrowly so, abruptly acuminate, the terminal one 

 10-20 cm. long, 2.5-6 cm. wide; peduncles 10-15 cm. long; 

 spathe with the upper margin of the tube broadly auricled, 

 the blade ovate, acuminate, bent forward and arching over the 

 spadix, dark purple with longitudinal white stripes; spadix- 

 appendage cylindric, slightly thickened at both ends, rounded 



at apex, truncate at base. Apr.-May. Honshu (Kanto 



Distr. and northw., incl. Oshima in Izu). 



Arisaema aequinoctiale Nakai & F. Maekawa. Kiyozumi- 



