342 AROiDE^E. [Arum. 



club-shaped or pointed appendix. Stamens distinct. Anthers 2-celled, sessile 

 or on short filaments. Ovaries 1-celled, with 1 or more ovules. — Rhizome 

 usually tuberous. Leaves entire or 3-lobed, on long radical petioles. Scapes 

 radical, without bracts under the spatha. 



A considerable genus, spread over the temperate regions of the northern hemisphere in 

 the Old World, extending in Asia into the' mountainous districts within the' tropics; that is, 

 if taken in what appears to be the most natural limits of the genus. It has, however, been 

 very much split up by modern authors, and the following as well as most other Asiatic species 

 excluded from it. 



1. A. divaricatum, Linn. Leaves cordate-hastate, acuminate, 2 to 4 

 in. long, the 2 basal lobes or auricles ovate-lanceolate or oblong and divergent. 

 Spatha tubular and green at the base for | to f in., then expanded into a deep 

 purple ovate lamina, near 2 in. broad, and tapering into a point of full 3 in. 

 Spadix deep purple. Ovaries at the base in several rows, with 1 or 2 erect 

 ovules in each ; then follow several rows of short subulate erect barren organs, 

 and after an interval of 3 or 4 lines, several rows of sessile anthers, the rhachis 

 terminating in a slightly thickened appendix tapering to a point full 3 in. 

 long. — Typkonium divaricatum, Blume, Kumph. t. 36; Schott, Prod. Aroid. 

 106. Arum trilobatum, var., Bot. Mag. t. 2324. 



Hongkong, Champion, Hance. Widely spread over India, from Ceylon and the Peninsula 

 to the Archipelago. 



The A. ternatum, Thunb. {Pinellia tuberifera, Ten.; Schott, Prod. Aroid. 20), a common 

 Chinese and Japanese plant, was gathered by Wright in Putoy Island, and will probably be 

 found in Hongkong. It is readily known by its narrow obtuse spatha, adhering at its base 

 to the spadix, the subulate point of which protrudes several inches beyond it. 



2. ARISJEMA, Mart. 



Characters of Arum, except that the spadices are unisexual, bearing the 

 flowers at or near the base, and usually barren organs below the point. 

 Anthers usually in distinct scattered clusters of 2 to 4 or 6 cells. — Habit of 

 Arum, except that the leaves are usually divided into 3 or more distinct seg- 

 ments. 



A genus of several species, dispersed over tropical and subtropical Asia and N. America. 



1. A. laminatum, Blume, Humph, i. t. 27 ; Schott, Prod. Aroid. 33. 

 Leaf-segments 3, ovate-lanceolate or oval-oblong, acuminate and aristate, 

 3 or 4 in. long ; the central one petiolulate, the lateral ones oblique at the base 

 and almost sessile. Spatha convolute at the base, the concave part 1£ in. 

 long, truncate at the top, with a broadly ovate lamina ending in a fine point 

 of I to 1 in. Spadix ending in a subulate point, extending to 1 or 2 in. above 

 the flowers, and bearing near the top, or immediately above the flowers, or 

 both, a few scattered subulate barren organs. Stamens in the males loosely 

 scattered, occupying about f in. of the base. Ovaries in the females closely 

 packed for 5 or 6 lines. Ovules about 4. Stigma raised on a short style. 



Hongkong, Harland, Wright. Also in Java. 



3. AMORPHOPHALLTJS, Blume. 



Spatha of Arum. Spadix continuously androgynous, without barren organs, 

 ending in an appendix sometimes acquiring enormous dimensions. Anthers 



