146 AiiOiDEJi:. 



lanceolato-spathnlata 12 mm. loiiga 4 mm. lata apice obtusissima basi attenuata. 

 8tamina 6 basi segmentorum affixa, filaraentis 1 cm. lougis filiformibus glabris, 

 antlieiis linearibus 3 mm. longis 1 mm. latis apice obtusis basi alte 2-lobatLs- 

 •Ovarium triangulari-obconicum vol obcordatum G mm. longum totiusque latura, 

 stylo 15 mm. longo apice capitato paltato rotundato l^ mm. in diametro. 



Hab. Bonbonzan, leg. B. Hayata et S. Sasaki, Mai. 1917. 



Near Heloniopsis umbelkUa, but diifers from it in the leaves which are 

 triangularly aeute and in tlie much longer anthers. 



Aroideae. 

 Ariscema Mabt. 



Arisaema quinquefoliola Hayata sp. nov. (Pl. VU). Caulis cum 

 spadice 40-50 cm. longus basi vaginatus glaber 2-fohatus. Folia dua alterna 

 cum spadice sequilonga pedatim 5-foliolata, foliolo tarminali ovato-lanceolato 

 11-14 cm. lougo 3-3 |cm. lato apice acuto subito longe caudato ad summum 

 arista insti'ucto basi acuto obtuso margine subintegro vel eroso glabro tenuiter 

 membrauaceo, petiohilo centi'ah 2^ cm. longo glabro, foliohs laterahbus ■ plua 

 minus minoribus conformibus basi plus minus obKquis, petiolulis brevioribus ; 

 petiohs communibus 10-12 cm. longis glabris *basi auricuhs vaginarum in- 

 structis. Spatha cyhndrica 8 cm. longa 13 mm. hxta glabra, lamina oblouga 

 apice tiiangulari-acuta vel acuminata medio subito refracto-recm^va. Spadix 

 gi'acihs 7 cm. longus basi deorsum staminifer, partibus sfcaminiferis 2| cm. 

 longis ; partibus superioribus graciUimis glabris apice breve j)6nicillatis. 

 Stamina secus partem iuferiorem spadicis consparsa, filamentis | mm. longis ; 

 locnhs antherarum 3-7 secus filamentum spicatim dispositis vel ad apicem 

 filamentorum aggregatis. 



Hab. Ako, Kuwarusu, leg. Y. Matsuda, Jan. 1918 ; Daibuson, -Jan. 

 1916. 



Kemarkable for its pedately 5-foholate leaves. 



