258 



Araceae 



1. Arisaema negishii Makino. Shima-tennan-sho, 

 Hengodama. Tuber depressed-globose, more or less irregu- 

 lar in shape, 3-7 cm. across; scalelike leaves 2, whitish, tuni- 

 cate; leaves 2, the petioles terete, 5-20 cm. long; leaflets 9-15, 

 lanceolate, 8-20 cm. long, 1.5-5 cm. wide, undulate, cuneate at 

 base; peduncle erect, elongate after an thesis, 4-8 mm. in di- 

 ameter; spathe light or pale green, the tube cylindric, slightly 

 ampliate above, the blade obliquely ascending forward, nar- 

 rowly ovate, 7-8 cm. long, gradually acuminate; appendage 

 of spadix linear, 10-15 cm. long, purplish, somewhat thick- 

 ened, long-exserted, gradually thickened at base, the floriferous 



part often with rather loose hornlike tubercles. Mar.-May. 



Honshu (Hachijo and Miyake Isls. in Izu). 



2. Arisaema heterophyllum BI. A. thunbergii var. 

 heterophylum (Bl.) Engl. Maizuru-tennan-sho. Mon- 

 oecious; tuber hemispherical, 2-4 cm. across; scalelike leaves 4 

 or 5, tunicate; normal leaf solitary, on a long erect stemlike 

 sheath to 1 m. tall and 1-2 cm. thick, the petiole erect-spread- 

 ing, 6-14 cm. long; leaflets 13-19, oblanceolate or oblong, sub- 

 abruptly contracted at apex, undulate on margin, the terminal 

 leaflet much shorter than the others, the first lateral ones 10-25 

 cm. long, 2-6.5 cm. wide; spathe on a long erect scape, green, 

 the tube 3.5-8 cm. long, dark purplish on margin, the blade 

 ovate, 7-12 cm. long, 3-7 cm. wide, usually green, bent for- 

 ward and arching over the spadix, abruptly short-acuminate; 

 appendage of spadix fiUform, erect, 15-30 cm. long, slightly 



thickened at base and passing into the floriferous part. 



May-July. Wet places in lowlands; Honshu (Kan to Distr. 

 and westw.), Shikoku, Kyushu; rather rare. s. Korea, For- 

 mosa, and China. 



3. Arisaema kiushianum Makino. Hime-urashima-s6. 

 Tuber nearly globose, with several small lateral tubers; leaf al- 

 ways solitary, the petiole terete, 15^0 cm. long; leaflets 7-13, 

 lanceolate, long-acuminate, 10-20 cm. long and 2-4 cm. wide 

 in the terminal one; scape arising near base of petiole, 5-15 

 cm. long; spathe uniformly dark purple, the blade broadly 

 ovate, strongly arching over the spadix, abrupdy narrowed to 

 a long cusp, with a white T-shaped mark inside; spadix-ap- 

 pendage slender, long-exserted, 15-18 cm. long, pendulous at 



tip, thickened below and passing into the floriferous part. 



May-June. Kyushu. 



4. Arisaema thunbergii Bl. Flagellarisaema thunbergii 

 (Bl.) Nakai Nangoku-urashima-s6. Tuber depressed- 

 globose, usually bearing a few small lateral tubers; leaf soli- 

 tary, the petiole nearly erect, terete, 30-60 cm. long; leaflets 

 9-17, linear- to broad-lanceolate, acuminate, 10-25 cm. long 

 and 1—4 cm. broad in the terminal one; peduncle arising from 

 the lower part of the petiole, 10-20 cm. tall; spathe uniformly 

 dark purple or reddish purple, sometimes purplish bronze, the 

 blade ovate, strongly arching over the spadix, the upper part 

 semipendulous and long-filiform tapering, 8-10 cm. long; 

 spadix-appendage filiform, 30-50 cm. long, erect, pendulous at 

 tip, gradually thickened below forming a densely wrinkled, 

 fusiform enlargement and further narrowed toward the flo- 

 riferous part. Apr.-May. Honshu (Chugoku Distr.), Shi- 

 koku, Kyushu. 



5. Arisaema urashima Hara. A. thunbergii sensu auct. 

 Japon., pro parte; A. thunbergii var. urashima (Hara) Ma- 

 kino; Flagellarisaema urashima (Hara) Nakai Urashima- 



s6. Closely resembles the preceding; tuber depressed-glo- 



bose, bearing several to rather many small lateral tubers; leaf 

 solitary (very rarely 2), the petiole terete, nearly erect, 30-50 



cm. long, the leaflets 11-15, oblanceolate to broadly lanceolate, 

 acuminate, the terminal one 10-18 cm. long, 2-3.5 cm. wide; 

 peduncle 10-20 cm. long, arising 7-15 cm. above base of petiole; 

 spathe dark to bronze-purple, sometimes reddish purple, the 

 blade ovate to broadly so, abruptly long taillike at tip, strongly 

 arching over the spadix; spadix-appendage filiform, 40-60 cm. 

 long, long-exserted, the upper half bent abruptly downward 

 and pendulous, gradually thickened below forming a smooth 

 oblong enlargement then gradually passing into the floriferous 



part. Apr.-May. Hokkaido (Oshima and Hidaka Prov.), 



Honshu, Shikoku. 



6. Arisaema heterocephalum Koidz. Amami-tennan- 

 SHo, Hosoba-tennan-sho. Pseudostem 30-70 cm. long, from 

 a hemispherical tuber; leaves 2, the petiole 7-20 cm. long; leaf- 

 lets 11-19, pedate, linear or linear-oblanceolate, the terminal 

 one 8-17 cm. long, 15-20 mm. wide; spathes dimorphic, the 

 pistillate with a green tube about 8 cm. long, ampliate in 

 upper part, the blade broadly ovate, 7 cm. long, short-acumi- 

 nate, the spadix-appendage 6.5 cm. long, narrowly clavate- 

 cylindric, an erect stipe about 6 cm. long; stamina te spathe 

 tubular, 7 cm. long, 5 mm. across, the spadix-appendage 



capitate at apex, on a stipe 7 cm. long. ^Reported to occur 



in Kyushu (Yakushima) Ryukyus, from Amami-Oshima 



to Okinawa. 



7. Arisaema ringens (Thunb.) Schott. Arum ringens 

 Thunb.; Arisaema trip hy Hum sensu Thunb., non L.; A. sie- 

 boldii de Vriese; A. praecox de Vriese; A. ringens var. sieboldii 

 (de Vriese) Engl, and var. praecox (de Vriese) Engl.; 



Ringentiarum ringens (Thunb.) Nakai Musashi-abumi. 



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

 leaves 2, the petiole terete, erect, 15-25 cm. long; leaflets 3, 

 rather thick, ternate, sessile, broadly rhomboidal-ovate, 8-20 

 cm. long, 4-10 cm. wide, entire, prominently lustrous above, 

 subabruptly narrowed into a filiform tail 5-15 mm. long; 

 peduncle short, 3-10 cm. long; spathe greenish (forma praecox 

 T. Koyama) or uniformly dark purple (forma sieboldii T. 

 Koyama), with a large auricle on each side on the margin of 

 the tubular part, the blade saccate-galeate, the lower half 

 obliquely ascending, the upper half strongly bent forward, 

 3.5-4.5 cm. long, short-caudate; spadix-appendage cylindric, 

 the base thickened and abrupdy contracted above the florifer- 

 ous part. Mar.-May. Woods near seacoast; Honshu 



(Kanto Distr. and westw.), Shikoku, Kyushu. Ryukyus, 



China, and s. Korea. 



8. Arisaema ternatipartitum Makino. Mitsuba-ten- 

 NAN-sHo. Tuber depressed-globose or hemispherical; leaves 

 2, the petiole erect-ascending, 7-20 cm. long; leaflets 3, rhom- 

 boid-ovate, 7-15 cm. long, 3-8 cm. wide, abruptly mucronate, 

 cuneate and sessile at base in the terminal one, rounded at 

 base in the lateral ones, bearing subtranslucent dense papillae 

 on margin; peduncle 10-15 cm. long, shorter than the petiole; 

 spathe dark purple, broadly auricled on the upper margin of 

 the tube, the blade long-deltoid, about 3 cm. wide, 7 cm. long, 

 acuminate, arching over the spadix; spadix-appendage cyl- 

 indric, rather stout, 2.5-3 mm. across, thickened and truncate 



at base. Apr.-May. Honshu (Suruga Prov.), Shikoku, 



Kyushu. 



9. Arisaema nanum Nakai. Hime-tennan-sh6. Tu- 

 ber hemispheric; leaf solitary, the petiole terete, 10-25 cm. 

 long; leaflets 5 (-7), somewhat palmate, elliptic to oblong, 

 abruptly short-cuspidate, cuneate at base, the terminal one 

 short-petiolulate, 8-15 cm. long, 4-7 cm. wide, the adjacent 



