82 
Since the appearance of Miiller’s Monograph in 1866 the atten- 
tion given to Chrozophora has been mainly confined to the forms 
met with in Africa; to a less extent attention has been bestowed 
on those which occur in India or in the Orient. Nothing new has 
had to be said or suggested with regard to those forms met with 
in the Occident. 
History oF THE AFRICAN Species, 1767-1912. 
In 1867 Schweinfurth enumerated four African forms (Beztr. 
became 
apparent. Schweinfurth accepted Miiller’s view that C. obliqua, 
Schweinf. (1862) SI be C. obliqua, A. Juss. (1826), which is 
- certainly sound. But he also accepted Miiller’s decision that C. 
obliqua, Schweinf. (1863) 3 is sasties with C. prostrata, Dalz. 
noe tir A. Juss., a decision Sahie an examination of Croton 
argenteum, Forsk. non Linn., the basis of Croton obliquum, 
ahl, proves to be without justification. 
Still further on in the same treatise (l.c. Aufzahl. p. 262) 
Schweinfurth supplied a new list which includes six African 
names. Of these 
. C. Brocchiana, from Nubia, is the plant figured by Schwein- 
furth under this name in 1862. 
2. C. obliqua, from the coasts of Egypt and Nubia, which is 
C. obliqua, Mill.-arg. (1866) and not C. obliqua, Schweinf. (1862) 
of the avkion list (l.c. p. 35). 
3. C. plicata from Egypt, Nubia, Sennar, “and Bahr-el-Abiad, 
which is still C. plicata, Schweinf. (1862) and therefore is Croton 
watt 790.” Vis. (1836), as contrasted with Croton plicatum, 
a 
4. C. prostrata, from Egypt, Nubia, paren. Sennar, and 
(1861) is ‘not that Indian plant, but is Pik African portion of 
C. plicata y. prostrata, Mill.-arg. (I866) and therefore at the same 
time is C. obliqua, Schweinf. (1862), non a Juss. (1826) nec 
Mill.-arg (1866). It is the true C. plicata, A. Juss. (1826), 
because it is the plant described by Vahl in 1790 as Croton 
get 
oe negalensis, from Kordofan, is the plant collected by 
Kotoake a Abu Gerad (Kotschy n. 25) which Baillon in 1858 had 
included in C. senegalensis, A. Juss., notwithstanding the fact 
that in this plant the homomorphic leaves are permanently ane 
scent an e green above, whereas in Croton sene galense, as 
cited by Lamarck in 1786 and described by Vahl in Gonaler 8 
