262 



Araceae 



TENNAN-sHO, HiGAN-MAMUSHiGUSA. Closely related to A. 

 limbattim. A stout plant with elliptic leaflets gradually at- 

 tenuate below and occasionally strongly toothed on margin. 

 Honshu (Boso Penin.) . 



39. Arisaema mayebarae Nakai. Hito-yoshi-tennan- 

 SHO. Tuber depressed-globose, about 3 cm. across; pseu- 

 dostem about 30 cm. long; basal scalelike leaves 4, normal 

 leaves 2, the lower one larger, with a petiole about 10 cm. 

 long, the upper one smaller, with a petiole 4 cm. long; leaflets 

 about 5, oblong, the terminal one petioluled, 11 cm. long; 

 peduncle about 12 cm. long; spathe with the tube about 9 cm. 

 long, 16 mm. across at base, ampliate above, the blade ovate 

 to broadly so, bent nearly at right angles or more downward, 

 about 8.5 cm. long, nearly as long as the tubular part, acumi- 

 nate, dark purple; spadix-appendage clavate, 6 cm. long, pur- 

 plish, thickened above, about 7 mm. in diameter at the ver- 

 rucose apex. Kyushu. Allied to Arisaema serratum, but dif- 

 fers chiefly in the longer blade of the spathe bent forward 

 horizontally. 



40. Arisaema serratum (Thunb.) Schott. Arum ser- 

 ratum Thunb.; Arisaema japonicum var. serratum (Thunb.) 

 Engl.; A. capitellatum Nakai; A. niveum Nakai; A. niveum, 



var. viridescens Nakai Kant6-mamushi-so, Murasaki-ma- 



MusHi-so. Tuber depressed-globose, without lateral tubers; 

 pseudostem 30-60 cm. long, terete, dark purple-spotted; leaves 

 2, the lower one larger, with an ascending petiole 10-20 (-30) 

 cm. long; leaflets 7-13, the terminal oblong to elliptic, 10-20 

 cm. long, 3-8 cm. wide, acuminate; peduncle erect, 10-20 cm. 

 long; spathe to 10 cm. long, the upper margin of the tube nar- 

 rowly recurved, the blade arching over the spadix, often elon- 

 gate, ovate to broadly so, 7-10 cm. long, acuminate, shorter 

 than the tubular part, dark purple with white longitudinal 

 stripes, the tip strongly declined over mouth; spadix-appendage 

 stout, cylindric to clavate, truncate at base, usually thickened 

 in upper part, globose, apex 6-10 mm. in diameter, wrinkled. 

 May-June. Honshu (Kanto, Shinano Prov.); very poly- 

 morphic. Forma capitellatum (Nakai) T. Koyama. A. 



capitellatum Nakai Nobidome-tennan-sho. Globose en- 



largement of spadix-appendage to 12 mm. across. 



41. Arisaema hachijoense Nakai. A. japonicum sensu 

 Matsumura, pro parte, non Bl.; A. serratum forma blumei Ma- 

 kino, pro parte, excl. syn. Hachijo-tennan-sho. Tuber 



globose, not depressed; pseudostem 10-30 cm. long; basal 

 scales 3-4; normal leaves 2; leaflets 5-9, the terminal oblong 

 to elliptic, 4-14 cm. long, 2-5 cm. wide, entire; peduncle as 

 long as the leaves, 7-11 cm. long; spathe erect, with white 

 longitudinal stripes, the tube 3-6 cm. long, 18-22 mm. in 

 diameter, margins on the upper part recurved, the blade ovate- 

 oblong, 7-10 cm. long, acuminate, longitudinally white-striped; 

 spadix-appendage gradually and slightly narrowed toward the 

 apex. Mar .-Apr. Honshu (Izu Isl.) . 



42. Arisaema japonicum Bl. A. pseudojaponicum. Na- 

 kai; A. serratum forma blumei Makino and forma japonicum 



Makino, pro parte. Mamushi-so, Jat6-so, Chinzei-tennan- 



SHO. Tuber depressed-globose, with few lateral tubers; pseu- 

 dostem 30-50 cm. long; leaves 2, the lower one larger, the 

 petiole nearly erect, 10-25 cm. long; terminal leaflet oblong 

 to broadly lanceolate, 10-30 cm. long, 3-8 cm. wide, abruptly 

 acuminate; peduncle 10-30 cm. long; spathe with the upper 

 margin of the tube narrow, recurved, the blade narrowly ovate 

 or oblong, 6-9 cm. long, obliquely bent downward, straight, 

 long-acuminate, dark purple (forma japonicum) or green 

 (forma viridans T. Koyama), longitudinally white-striped; 

 spadix-appendage cylindric, 1-3 (-5) mm. in diameter, not 

 thickened above, smooth, slightly thickened and truncate at 



base. Apr.-May. Honshu (Echizen, Mino, Omi Prov. 



and westw.), Shikoku, Kyushu. 



Var. brachyspatha T. Koyama. Tokai-jato-s6. Spathe- 

 blade considerably shorter, bent forward horizontally, abruptly 

 narrowed at apex, short-acuminate, otherwise with the charac- 

 ters of the typical phase. Honshu (Suruga, Mikawa, Owari 



Prov. and elsewhere) . 



Var. akitense Nakai. Yamase-mamushi-so. Leaflets 

 larger, oval to obovate-oval, to 10 cm. wide, otherwise with 

 the characters of the typical phase. Honshu (Ugo Prov.). 



4. TYPHONIUM Schott Ryukyu-hange Zoku 



Perennial herbs with tubers; leaves pahnately 3- to 5-parted, petiolate; tubular part of the spathe short, persistent, constricted 

 at the mouth, the blade narrowly ovate to linear, deciduous; spadix exserted from the spathe, neuter between the pistillate and 

 staminate parts, the appendage elongate, smooth; ovary 1-locular, with 1 or 2 orthotropous erect ovules; stigma sessile; berries 

 ovoid, 1- or 2-seeded; endosperm present. More than 20 species, in tropical regions of the Old World. 



1. Typhonium divaricatum (L.) Decne. Arum divari- 

 catum L.; A. trilobatum Thunb.; T. trilobatum (Thunb.) 



Masam. Ryukyu-hange. Tuber nearly globose; leaves 



radical, on slender petioles 10-20 cm. long, broadly cordate- 

 sagittate, 3-lobed, 5-10 cm. long and as wide, die lobes acute, 

 entire, the middle one broadly ovate, the lateral smaller, di- 

 varicate; scape radical, 4-8 cm. long; spathe 2.5-3 cm. long, 

 the mbe narrowly ovate, 15-18 mm. long, the blade elongate- 



deltoid, 8-12 cm. long, dark purple, gradually broadened be- 

 low and rounded at base, gradually narrowed above to a sub- 

 acute apex; neuter flowers linear, die upper ones ascending, 

 the others reflexed, the appendage of spadix linear, erect, pur- 

 plish, nearly uniformly wide from base to acute apex, some- 

 what obliquely truncate at base. May-Aug. Kyushu (s. 



distr.). Ryukyus, Formosa, India, Malaysia, and s. China. 



5. ALOCASIA Neck. Kuwazu-imo Zoku 



Perennials; stem short, hypogeous or epigeous; leaves sheathing at base, long-petioled, peltate at least when young, ovate- 

 cordate, simple, entire or sometimes pinnately parted, with ovate segments; peduncles axillary, several; spathe with oblong 

 persistent tube shorter than the deciduous, sometimes cucuUate blade; spadix with the neuter part slender, the appendage 

 thick-cylindric, not longer than the spathe, continuous with the staminate part; stamens 3-8; ovary 1-locular, with a very short 



