Aponogeton undulatus
Content
Description
Tuber globular, obovoid, or elongate, 6-25 mm ø, smooth.
Ovaries 3(-4), light pink, 1¼-2 by ½-1 mm;
Fruit 5-7 by 4 mm with a short, terminal, curved beak.
Seeds with a simple testa;
Distribution
Asia-Tropical: Malaya (Peninsular Malaysia present); Thailand (Thailand present), Burma present, E. Pakistan present, Johore present, NW., N. and NE. India present, Sg. Sedili at Mawai present
NW., N. and NE. India, E. Pakistan, Burma, ?Thailand; in Malesia: ? Malay Peninsula (Johore: Sg. Sedili at Mawai).
Notes
There are no specimens which specimens proved to come from Malaya. The only have been I have seen were collected in the Van Cleef Aquarium at Singapore. They are said to have been collected in the Sg. Sedili at Mawai, but I am not convinced that this record is reliable. These specimens have been described as A. stachyo-sporus. Also the occurrence in Thailand has not yet been proved. Yearly many thousands of corms are exported from Bangkok for aquarium purposes. They are claimed to have been collected near Chanthaburi and Haadyai (close by the Malayan frontier), but up till now I have not seen herbarium specimens collected in Thailand either.
It is remarkable that A. undulatus flowers very seldom in cultivation. I have been cultivating specimens from different localities for more than twelve years, but up till now only once an inflorescence has developed.
It seems that in the eastern part of its range the leaves are more narrow than in the western part; moreover, the eastern populations seem not to tend to develop floating leaves.
It is remarkable that A. undulatus flowers very seldom in cultivation. I have been cultivating specimens from different localities for more than twelve years, but up till now only once an inflorescence has developed.
It seems that in the eastern part of its range the leaves are more narrow than in the western part; moreover, the eastern populations seem not to tend to develop floating leaves.