Van Alderwerelt van Rosenburgh : Malayan Araceae 3. 323 



inflorescentia mascula quam feminea tantum + 2-plo longior, 2^/4—3 cm. 

 longa, perpallide flavida, sublactea, obtusa. 



Probably very near A. obLongifoLiiim Knth. 



Sumatra: Dell, Sibolangit and Deleng Tindjo, in forest, ait. 

 350-700 m. (J. A. LôRZING No. 5352, 14 October 1917, No. 5887, 

 8 August 1918). 



Forma maximum: Petiolus 10—15 cm. longus, usque 12 cm. longe 

 vaginatiis; lamina usque 45X12 cm. Spatha 8'/2— 10'/2 cm. longa. 

 Spadix 1 — r/2 cm. longe stipitatus ; inflorescentia feminea 2 cm. longa; 



ovaria stigmate ; inflorescentia mascula 5—6 cm. 



longa, 



Cultivated in the Buitenzorg Gardens, flowering September 1921. 



Sumatra: Deli, Sibolangit. (W. DOCTERS VAN Leeuwen). 



Aglaonema simplex, Bl., in Rumph., 1, 152, tab. 36 D, 65; ENGL., 

 in Pflzrch., LXIV (IV, 23 De), 22. 



In contradiction with the diagnoses given by Engler many of the 

 fruiting spécimens of this species, occurring in the Buitenzorg Herbarium 

 and especially those determined by Engler himself, hâve the pétiole shorter 

 (3—10 cm. long) and not rarely a smaller lamina; only the forma 

 macropliyUiim, of which Engler gives no diagnosis, has the pétiole longer, 

 I7V2— 25 cm. long. 



A spécimen gathered in S u m a t r a ( Palembang, Mt. Dempoe, E. Jacobson 

 No. 509) has the lamina proportionally short and broad, 9—13 X 4'/,— 6 cm., 

 and the spathe yellow. 



With regard to the forma macrophylliim quoted above, 1 observe that 

 of Koorders' Nos. 16126, 16129, 16155 mentionedin Engler's monograph, 

 the second is wanting in our Herbarium and the first, of u'hich we possess 

 only a single leaf, a peduncle and two berries, has originally been determined 

 by Engler as A. oblongifolUim Knth, and, with regard to the fine primary 

 veins of the same, which are but slightly stouter than the secondary ones, 

 it agrées in my opinion more with A. oblonoifoliiim than with .4. simplex, 

 which is also the case with No. 16155. Ail our spécimens of A. simplex 

 hâve the primary veins distinctly stouter than the secondary ones. 



Two forms united by intermediates: 



Forma typiciim: Leaves with the lamina rather equalsided, rotundate- 

 cuneate to -truncate and sometimes slightly emarginate at the base. 



Forma inaeqiiale: Foliorum lamina basi inaequilatera, oblique rotundafo- 

 truncata, vel oblique rotundata, i.e. altero latere rotundato-cuneato vel 

 rotundato, altero latere paullo longiore, rotundato vel rotundato-truncato, imo 

 hinc inde brevissime decurrenti-cuneata. Spatha pallide viridis. Spadix albus. 



Lingga Archipelago: Poeloe Singkep. near Manggoe, road 

 side in forest, ait. 50 m. (H. A. B. BiiNNEMEIjFR No. 7180, 2 August 

 1919). 



