X, C, 5 
Merrill: Philippine Plants, XII 
289 
This species has not previously been reported from the Philippines. 
Widely distributed in central and in temperate eastern Asia, extending from 
Sikkim and Tibet to Japan, southward to Burma, southern China, and 
Formosa. It is known from no part of Malaya and must be considered a 
northern type in the Philippine flora. 
The commoner and widely distributed Acorus calamus L. occurs in 
the Philippines as an introduced and cultivated plant, but is thoroughly 
spontaneous in some localities in Mountain Province, Luzon. 
AMORPHOPHALLUS Blume 
AMORPHOPHALLUS LUZONIENSIS sp. nov. § Conophallus. 
Tuber parvum, depresso-globosum, in siccitate circiter 2 cm 
diametro; foliis umbraculiformibus, tripartitis, segmentis cir- 
citer 20 cm longis, pinnatisectis, segmentis utilimis oblongis vel 
oblongo-ovatis, caudato-acuminatis, 5 ad 9 cm longis; petiolo 
circiter 50 cm longo; pedunculis tenuibus, 10 cm longis; spathis 
circiter 15 cm longis, 6 cm latis, purpureis ; spadicis quam spatha 
paulo brevioribus, cylindraceis, supra sensim caudato-angustatis ; 
stilus quam ovario triplo longior. 
Tubers depressed-globose, when dry about 2 cm in diameter, 
emitting many roots. Petioles slender, about 50 cm high ; lamina 
umbraculiform, 3-partite, the segments pinnatisect, about 20 cm 
long, membranaceous, the ultimate segments oblong to oblong- 
ovate, caudate-acuminate, 5 to 9 cm long, nearly the same color 
on both surfaces or slightly paler beneath, the sinuses acute, 
extending almost or quite to the rachis. Sheaths of the peduncles 
membranaceous, brown when dry, the outer ones oblong-lanceo- 
late, 2 to 3 cm long, the inner ones lanceolate up to 10 cm in 
length ; peduncles slender, up to 10 cm in length. Spathes purple, 
about 15 cm long, thin, the tube broad, about 6 cm long, the lamina 
ovate, slightly acute-acuminate or merely acute, about 6 cm wide. 
Spadix slender, cylindric, a little shorter than the spathe, the 
pistillate part about 2.5 cm long, 1 cm wide, the staminate part 
contiguous, about 3 cm long and 8 mm wide, the appendage 
slender, continuous, verruculose, caudate, at the base 5 mm in 
diameter or less, gradually narrowed upward, the entire spadix 
about 14 cm long. Pistillate flowers: Ovary depressed, about 
1 mm long, 1.5 mm wide, 1-celled, 1-ovuled; style slender, about 
3 mm long; stigma ovoid, entire, somewhat oblique, about 1 mm 
long. Staminate flowers crowded, mostly 2-androus, the anthers 
subglobose, 1 mm long, 1.5 mm wide, opening by two terminal 
slits. 
Luzon, Province of Cagayan, Abulug River, For. Bur. 19560 Curran 
(type), January, 1912, Weber s. n., same locality and date. 
A species growing in crevices of limestone ledges, quite different from 
any other known Philippine form. Apparently through its elongated styles 
