[Crown Oopyright Reserved. 
ROYAL BOTANIC GARDENS, KEW. 
BULLETIN 
MISCELLANEOUS INFORMATION. 
No. 7] [1921 
XXXI.—REVISION OF THE GENUS 
TRYPHOSTEMMA. 
J. Hutrouinson and K. PEarce. 
For some time past it has been found difficult to determine 
specimens of the African genus T'ryphostemma (Passifloraceae), 
owing to the large number of.described species since the publica- 
tion of the second volume of the Flora of Tropical Africa. In 
that work the genus was represented by a single species, 
Tryphostemma zanzibaricum, Mast., besides two species of 
Basananthe, Peyr., now considered synonymous. The present 
paper presents a working key and an enumeration of the known 
species of the genus, although the material of several of them 
is still far from adequate. The specimens preserved in the Kew 
Herbarium and the Natural History Museum, South Kensington, 
are included, and our thanks are due to Dr. A. B. Rendle for 
allowing us to examine those under his charge, and to Mr. E. G. 
Baker for supplying the description of 7’. reticulatum. 
The genus 7'ryphostemma was founded by Harvey* for a 
Natal plant, 7’. Sandersonii, a species without petals. In 1871, 
Masterst added a second species from Zanzibar, T'. zanzibaricum, 
also without petals. Subsequently several species have been 
described in which well developed petals are present, and Engler 
in 1892 pointed out the desirability of including Basananthe, 
Peyr. He divided the genus into three sections, I. Hutryp 
stemma, petals absent and the outer part of the corona with 
one series of fimbrillae; II. Neotryphostemma, petals present, 
and the corona as in the preceding section; and III, Basananthe, 
petals present, outer part of corona with one series of fimbrillae 
and one series of small inflexed teeth. Although these features 
may be constant, they are not readily ascertainable from dried 
specimens, and we have consequently employed other and more 
obvious characters, based on the leaves and stipules, from 
which a natural classification seems to result. 
* Harv. Thes. Cap. i. t- 51 (1859). 
¢ Fl. Trop. Afr. ii. 508. 
2 (78)15792 Wt81—P 20 1000 9/21 Item7 
