THE FLORA HONGKONGENSIS. 113 
23. Ipomoea tuberculata, Roem. and Schult.; Choisy in DC. Prod. 
ix. 386. 
Now spread more or less over the island, flowering during the 
whole year. Scattered throughout all the warmer regions of the 
globe. Seeds with a close cinereous pubescence, and besides with 
long brownish-white wool, forming a beard along the two lateral 
angles. Iam very doubtful whether this is really indigenous ; for I 
know of no plant which grows so rapidly and spreads over such 
an enormous space. When once it has obtained a footing in a 
garden it is almost impossible to eradicate it; and its embraces 
are fatal to many trees and shrubs. The old stems are wonder- 
fully tenacious, and would make admirable ropes for packing 
cotton and other merchandise. Mr. Bentham (Fl. Austr. iv. 415) 
refers this to Z. palmata, Forsk.; but I do not adopt the name, be- 
cause there is a good deal of obscurity about this and allied spe- 
cies. Moreover Mr. Bentham includes under this name J. pul- 
chella, Roth, which, to judge from Kotschy’s Kordofan specimens 
(Iter Nub. n. 177), is surely, as remarked by Grisebach (Fl. Br. 
W. Ind. 470), quite distinct. 
24. Ipomeea obscura, Ker; Choisy in DC. Prod. ix. 370. 
On grassy hill-sides near the sea in the neighbourhood of 
Aberdeen ; first gathered by me in May 1858. Occurs through- 
out Tropical Asia, continental and insular, in Abyssinia, and in 
Queensland. 
*Ipomcea angustifolia, Jacg.; Benth. in Fl. Austr. iv. 425. (=I. fili- 
caulis, Blume; Benth. Fl. Hongk. 238.) 
Dr. Thwaites (Enum. Pl. Zeyl. 211) refers this to Z. tridentata, 
Roth. 
25. Ipomeea sinuata, Ortega; Choisy in DC. Prod. ix. 362. 
Amongst grass and in hedges. Extends from the Southern 
United States, throughout the whole of Tropical South America, 
and the West-India Islands—and is also found in various parts 
of the Old World, though perhaps not really wild there. 
26. Ipomoea involucrata, Beauv. ; Mig. Fl. Ind. Bat. ii. 609. (=I. pi- 
leata, Roxb. Fl. Ind. i. 504.) 
On the grassy hill-side about halfway up to Victoria Peak ; 
found only once, by Mr. C. Alabaster in October 1856. Common 
on the west coast of Africa, and occurs also in Madagascar, Java, 
and India; but Roxburgh says it was introduced into Calcutta 
from China. 
LINN. JOURN.—BOTANY, VOL. XIII. I 
