Feb. 16, 1914 
Citropsis , an African Genus Allied to Citrus 
429 
Both of these specimens, as well as one in the herbarium at Brussels, 
collected in Congo by Messrs. Laurent in 1903-4, but without exact 
locality or date, have trifoliate leaves, long, slender leaflets, with the 
terminal one disproportionately long, being no to 165 by 30 to 45, while 
the adjacent lateral leaflets are 65 to 90 by 25 to 45; thus the terminal 
leaflet is from two-fifths to one-third longer than the lateral. The only 
species to which these specimens can be referred at present is Citropsis 
Schweinfurthii , but in the absence of flowers and fruits and because of 
the rather unusual appearance of the leaves such reference must be 
merely provisional. 
Citropsis Schweinfurthii is a spiny shrub or small tree with 3- to 5- 
foliate leaves. The flowers are borne in clusters of 4 to 10 in the axils 
of the leaves. (See fig. 6.) 
They are 4- or rarely 5- 
parted with strap-shaped 
petals, a short, thick style, 
6 to 9 mm. long, scarcely 
narrower than the stigma 
but rather sharply set off 
from the rounded tip of the 
ovary, and broad flattened 
filaments with a subulate 
apex where the anther is 
attached. The leaves are 
pinnately 5-foliate or tri¬ 
foliate. The petioles are 
broadly winged, 40 to 75 
by 18 to 35 mm., narrowly 
obovate or elliptical, usu¬ 
ally rounded at the tip 
and bluntly pointed at ,the 
base. The segments of the 
rachis are 35 to 65 by 15 to 25 mm., usually elliptical, bluntly pointed at 
both ends but more rounded (sometimes rather broadly rounded) at the 
tip. The leaflets, 55 to 125 by 15 to 50 mm., are broadly lanceolate, 
narrowed from the middle to the long, cuneate base and into an acute 
or subacute tip, with strongly marked serrations. (See fig. 7.) The ter¬ 
minal leaflet is often much larger than the adjacent lateral leaflets, some¬ 
times one-third longer, usually from one-fourth to one-eighth longer. The 
spines, 12 to 30 mm. long, are usually paired in the axils of the leaves. 
Citropsis Schweinfurthii differs from all its congeners in having a short, 
thick style (shorter than any other species except C. gabunensis y which 
has very small flowers, with a slender style) and slender, broadly 
lanceolate leaflets, narrowing from the middle into a long, cuneate 
acute base. 
Fig. 6—Citropsis Schweinfurthii: Cluster of flowers, showing 
stamens arranged to form a staminal tube. From a plant 
growing in greenhouse of the Department of Agriculture, 
grown from seed from Budongo Forest, Uganda, Africa. 
(C. P. B. No. 2902.) Natural size. 
2 4395 — 1 4 - 
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