83 
monograph of 1807, the dimorphic leaves are dark green and 
glabrous above. 
6. C. tincteria, from’ Egypt, Nubia, and Abyssinia, includes 
two distinct species. The HKgyptian plant is the ‘ Tournesol ’ 
itself, Chrozophora tinctoria, A. Juss. (1824). That from the 
coasts of Nubia and Abyssinia is not the ‘Tournesol’ with red- 
purple ripe capsules, but the condition assumed in its first year 
by the species with blue-purple ripe capsules, which is C. oblongi- 
jolia, A. Juss., but which Schweinfurth, copying from Miller, 
had been misled into believing ought to bear the name C. obliqua. 
The account of the genus by Boissier in 1879 (Fl. Orient. iv.) 
includes two forms which are characteristic only of that part of 
the Orient which lies within the African continent, viz. :—Chrozo- 
phora plicata and C. tinctoria 8. subplicata, though all save one 
of the other Oriental species also occur in Africa. The interest 
which attaches to Boissier’s treatment of C. plicata lies in the 
fact that this species is held,both by the references and the speci- 
mens cited, to include Croton plicatum, Vahl (1790) and Croton 
oblongifolium, Vis. (1836). These two plants, considered by 
Boissier to be indistinguishable, were regarded by chweinfurth 
in 1862 as separable species and by Miller in 1866 as separable 
varieties. Schweinfurth, in 1867, while accepting Miller’s views 
as regards the names the two should bear, did not adopt Miiller’s 
decision that they should be regarded as conspecific. 
The interest which attaches to Boissier’s treatment of C. tine- 
toria 8. subplicata lies in his suggestion that this form may be a 
natural hybrid between C. tinctoria and C. plicata. It has to be 
said, in favour of this view, that C. subplicata is confined to the 
small area within which the regions occupied. by C. tinctoria and 
But apart from the circumstance that C. sub- 
plicata has the prostrate habit characteristic of C. plicata there 
is nothing to justify the suggestion. In every other feature C. 
characters of Miiller’s proposed variety. Boissier had observed, 
se 
A. Juss. (1826), a view whic _Schweinfurth 
‘ . 2, p. 306). 
Ascherson and Schweinfurth in 1887 (l.c.) also for the first time 
recorded C. tinctoria, var. hierosolymitana, Mill.-arg., as an 
Egyptian plant. es 
