AROIDE^E. 



243 



no leaf, it is a little doubtful if it really belong to the same species. Either 

 type or original description I have never seen. So far as the description given 

 by HOOKER is concerned, our plant is highly probably referable to this species. 

 The above description is drawn up from a set of perfect specimens collected 

 in Mt. Arisan. 



Arisaema formosana HAYATA n. n. (Fig. 87). Ariscema alienatum SCHOTT 

 var. formosana HAYATA Mater. Fl. Formos. p. 371. 



Very near A. alienatum SCHOTT. ( = A. concinnum SCHOTT Bot. Mag. t. 5914); 

 but differs from it by the very much more slender appendex, and by the much 

 more densely arranged male and female flowers. 



HAB. Mt. Arisau : a Funkiko usque ad Arisan, 4700- 

 7500 ped. alt., leg. B. HAYATA et TAKEO ITO, Mart. 1914. 



The original specimen of Ariscema alienatum var. 

 formosana HAYATA is rather imperfect and therefore it 

 is at present difficult to identify the present plant 

 with the original ; but in all probability, I think the 

 Ariscema in question is identical with the former. As 

 the original description is based upon an imperfect 

 specimen, it is my desire to give here another exhaus- 

 tive description drawn from perfect material. The 

 segments of the leaves are very variable in number, 

 shape and size. They vary from 7 to 11, from lanceolate 

 to narrow linear, from 8 cm. to 25 cm. in length and 

 from 4 mm. to 4 cm. in breadth. Petioles are some- 

 times snake-colored, but sometimes are not at all 

 maculated. The appendices of the spaclix are usually 

 softly setose, but sometimes quite smooth. 



Tuber depresso-globosurn 25 cm. in diametro 1 cm. 

 longum, radicibus facie superiore tuberis sitis. Folia singula, petiolo 76 cm. 

 longo basi cum vaginis 15 mm. lato purpureo-marmoreo, vaginis 2-3 dispositis 

 tenuiter membranaceis, lamina radiatim 13-secta (interdurn 7-11), segmentis 

 lanceolatis vel obovato-lanceolatis 20 cm. longis 4cm. latis apice caudato-acumi- 

 natis (acuminibus 1-2 cm. longis apice filiformibus) basi gradatim attenuatis 



Fig. 87, Ariscema, 

 formosana HAYATA; a, 

 a male spadix ; b, a 

 female spadix. 



