Feb. 16, 1914 
CitropstSy an African Genus Allied to Citrus 
433 
Citropsis mirabUis differs from all its congeners in having large flowers 
with slender styles not much broadened at the base and, in consequence, 
rather clearly delimited from the tip of the ovary. (See fig. 4.) It 
somewhat resembles C. Preussii in the size and shape of the leaves. 
imperfectly known species 
Citropsis articulata (Willd.), n. comb. 
Citrus articulata Willd., 1826, in Spreng., Syst. Veg., v. 3, p. 334 - 
The following material has been consulted: Gold Coast.— Isert (No. ?; Willde- 
now Herbarium No. 14357)* June or July, 1786, near Kommang, Akwapim 1 (Dahlem 
Herbarium). (?) Togo.— Baumann (No. 552), 1894-5, on the Koli River near Kame 
(Dahlem Herbarium). 
The specimen in the Willdenow Herbarium at Dahlem, of which a 
photograph was kindly sent to the writers by Prof. Urban, now shows a 
single twig, 21 cm. long and to 4K mm. in diameter, with 10 or 11 
intemodes which are mostly 2 to 2^ cm. long, slightly angular, with 
prominent leaf scars. Only two single spines are preserved, one 8 by 1 
mm., the other 14 by 1 % mm. Two petioles are on the sheet: One, still 
attached, obovate in outline, 52 by 32 mm. tapering gradually into the 
sharp base 4 to 5 mm. long; the other broadly rounded at tip, 60 by 37 mm. 
with prominent veins, running nearly at right angles to the midrib, the mar¬ 
gin very shallowly undulate crenate. It is evident that the Isert specimen 
at Dahlem was more complete when Sprengel published Willdenow’s 
description, as the leaves are said to be oblong and the peduncle many- 
flowered. Probably only a single terminal leaflet was originally present. 
The many-flowered peduncle seems also to have fallen off since Willde- 
now's time, as none can now be seen on the photograph. 
To this species has been doubtfully referred a specimen from Togo- 
land collected by E. Baumann (No. 552), on May 16, 1895, on the Koli 
River near Kame, probably not very remote from the locality where 
Isert's type was collected. The Baumann specimen has 3- to 5-foliate 
leaves, with petioles varying somewhat in size and shape, 35 by 13, 
60 by 25, 32 by 50, 40 by 18, or 30 by 20 mm. Curiously enough, the 
terminal portion of the twig, including the last five or six internodes, 
has lost its leaves except one obovate petiole. It has three single spines 
and in general resembles in a striking manner Isert’s specimen, upon 
which Willdenow based his species. Another curious coincidence is in 
the presence of the terminal leaflet of an originally trifoliate leaf from 
which the two lateral leaflets have fallen. It was probably from such 
an apparently unifoliate leaf originally present on Isert’s specimen that 
1 Isert found this plant in the mountains some so to 75 km. north of Accra and says of it: 41 Je vis une 
nouvelle esp^ce de citroniers, avec des feuilles articulees.” (Isert, P. E. Voyages en Guinee et dans les 
lies Caraibes en Amdrique, p. 255-256. Paris, 1793- A reprint of the original edition, Reise nach 
Guinea . . . 1788, appears in Allgemeine Geschichte der neuesten Reisen und Entdeckungen, v. 1.) 
