51(3 Bulletin de la Société de Pathologie exotique 
This éruption (Fig. 4) only spread slightly because the plant 
vvas partially dry and because contact was maintained only for 
a few seconds. 
In our opinion this proved tliat tlie plant could produce an 
éruption in certain persons, but not in ail because the partially 
dried plant quite failed to do so in other inembers of the labora- 
torystaft. Therefore two factors are required to produce the érup¬ 
tion viz., the plantanda person susceptible thereto. 
We were unable to Iràce any family history in our patient of 
susceptibility to Rues or to other plants. 
We therefore conclude that the éruption from which our sus¬ 
ceptible patient suffered in Dongola was a Dermatitis Venenata 
caused by the rue Haploptujllum tube reniât uni (Forskal 1775 ) 
(Fig. 1 ) which we will now briefly describe. 
Haplopiiyllum toberculatum. — This plant is depicled in the 
attached plate of photographs. The left hand illustration is a 
photograph of the plant showing flowers and capsules while the 
right hand illustration is a sketch of the main characters of the 
saine plant kindly lent to us by Mrs. Growfoot. The lower illus¬ 
trations depict a flower and the experimental éruption, mentio- 
ned above. 
The plant was first described as Ruta tuberculata by Forskal 
011 page 86 of bis Flora Ægyptiaco-Arabica, when he draws 
attention to the smell in the following words : « Odor suavis, 
fortis velut Rutæ hort ». Ile also mentions the tuberculated cap¬ 
sule, the linear-lanceolate leaves witli involuted margins. He 
says that the Arabs call it Mæddjenninæ. 
Adrien de Jussieu i n bis « Mémoires sur les Rutacées» published 
in Mémoires du Muséum d 1 Histoire naturelle , tome XII, for 1826 
separated off the genus Aplophijllum from Ruta but this was alte- 
red by H. Reichenbacii in i832 in bis « Flora Germanica Excur- 
soria » to Haplopiiyllum and so it is called at the présent lime. 
The principal points of this genus are that the leaves are gene- 
rally simple, the petals entire, and the llowers almost constantly 
pentamerous while the ovules are few in number in each carpel 
(Bâillon IV, 682 ). Muschler in 1912 (page 584) gives the petals 
as tive and the stamens as ten. 
Définition. — Muschler defines the genus Haplopiiyllum as 
follows : 
