Pistia.] CLXVI. AROIDEJ;. (J. D. Hooker.) 497 



P. Stratlotes, Linn. Sp. PI. 963 ; Roxb. Cor. PL iii. 63. t. 269 ; Fl. 

 Ind. iii. 131; O-riff. Notul. 12, 211; Ic. Plant. Asiat. t. 260, 261 ; Dalz. & 

 Gibs. Bomb. Fl. 281 ; Sot. Mag. t. 4564. Rheede Sort. Mai. t. 32. 



Throughout INDIA, and CEYLON; in still sweet water. DISTEIB. tropics 

 generally. 



Roots of tufted simple white fibres clothed with fibrillas. Leaves l-4 in. long 

 in Indian forms, apex rounded or retuse, ttndulate, pubescent above and beneath ; 

 nerves raised beneath, flabelliform, converging within the margin. Spatlie white, 

 obliquely campanulate, ^in. long, tomentose externally, gibbous and closed below, 

 contracted about the middle, dilated and nearly circular above. 



4. ARXS2EXKA, Mart. 



Tuberous herbs. Leaves 3-sect, pedatisect, or leaflets whorled. Spathe 

 deciduous, tube convolute, limb often acuminate or tailed, usually in- 

 curved. Spadix included or exserted, appendage various often excessively 

 long and filiform. Male fl. many, stipitate (sessile and connate in a 

 continuous stratum in A. flavum), anthers 2-5 oblong or subglobose. Fern. 

 fl. densely crowded ; ovary 1-celled; style short or 0, stigma disciform ; 

 ovules 2 or more, basilar, orthotropous. Neuters 0, or a few above the 

 males or females, or on the appendage, subulate. Berries 1-few-seeded. 

 Seeds albuminous ; embryo axile. Species about 50, temp, and trop. Asia, 

 and JS". America. 



The characters taken from the plants being mono- or dioecious are not absolute 

 but very constant, as are those of leaves one or two. 



A. TSISECTA. Leaves trifoliolate (Sp. 1-17). 



* Appendage much shorter than the limb of the spa,the. Usually all 

 dioecious. 



1. A. Roxburgh!!, Kunfh Enum. iii. 18; leaves 2, leaflets ovate- 

 lanceolate caudate-acuminate lateral subsessile median petiolulate, limb of 

 spathe ovate-lanceolate acuminate incurved or involute, appendage very 

 slender acute naked or with a few basal neuters. Schott Syn. Aroid. 27 ; 

 Prodr. 33. A. cuspidatum, Engler Arac. 536. Arum cuspidatum, Eoxb. 

 Fl. Ind. iii. 506 ; Wight Ic. t. 78-4. 



PENANO-, Roxburgh ; on Govt. Hill, alt. 2000 ft., Curtis. PERAK, Scortechini, 

 Kunstler. DISTEIB. Java (Ic. Horsfield.} 



Rootstock horizontal, rooting all over. Petiole elongate sheathing the scape, 

 14-18 in., and peduncle mottled-green and pink; leaflets 4-10 by 1-5 in. Spathe 

 pale yellow-green, tube 4 in., longer than the limb, margins not recurved around 

 the mouth of the tube in Roxburgh's drawing, but distinctly in one of Seortechini's, 

 which represents a much broader strongly incurved limb of the spathe with a caudate 

 tip. Male spadix very slender, tapering into the short filiform appendage which 

 bears a few subulate neuters. 



2. A. Kunstleri, HooJc.f. ; leaf solitary, leaflets ovate or ovate-lanceo- 

 late subcaudately acuminate all or the median only petiolulate, limb of the 

 green, spathe suberect ovate-lanceolate acuminate about as long as the 

 tube but broader, base dilated round the tube hardly recurved, male 

 spadix very slender ending in a very slender naked finely acuminate 

 appendage. 



PERAK, Kunstler (Ic. in Herb. Calcutt.). PENANG, King's Collector (1653), on 



Govt. Hill, alt. 2000 ft., Curtis. ? KHASIA HILLS ; Nya Bungalow, alt. 2000 ft. 

 Clarke. 



VOL. VI. K k 



