12 
Journal of Agricultural Research 
Vol. I, No. x 
30 feet in the Khasi region and has not been recorded over 20 feet in 
China. This, however, might easily be due to differences in the expo¬ 
sure, orange trees growing in a forest often being much taller than those 
in the open without shade. 
More material and, above all, ripe fruits will be needed to decide defi¬ 
nitely whether the Khasi “wild orange” belongs to Citrus ichangensis . 
It is certainly much more closely related to this latter species than to any 
other. For the present it seems best to consider it as a subspecies of 
the Ichang lemon. The technical diagnosis is as follows: 1 
Citrus ichangensis latipes Swingle. 
Differs from C. ichangensis in having the leaves more variable in size and shape 
with the tips acute, not caudate, the flowers in few-flowered (3 to 5) panicles instead 
of solitary, and the fruits oblate instead of prolate spheroidal in shape. 
Distribution: Assam, Northeastern India. Khasi Hills 
Living Bridge , 2 Hooker and Thomson, September 2, 1850, "small orange, wild” 
fruits, Kew; Myrung Wood (altitude 5,700 ft.), J. D. Hooker and T. Thomson, July 6, 
1850, "Aurant. Tree 30 ped. alt. Frt size of a walnut,” fruits, Kew; Moflong 
(altitude 6,000 ft.), 3 J. D. Hooker and T. Thomson, July, 1850, fruits, Kew; Moflong( ?), 
J. D. Hooker and T. Thomson, “Citrus latipes H. f. and T. Regio temp, (indig.) 
alt. 5,000-6,000 ped.,” 4 no date, sterile twigs, Harvard (Gray Herbarium); Khasi 
Hills, C. B. Clarke No. 21879 (Collector Rutton), 1873, flowers, British Museum. 
DETAILED description of citrus ichangensis latipes 
The leaves of Citrus ichangensis latipes vary greatly in size and shape, 
ranging from 65 to 152 by 12 to 48 mm., the length varying from three 
to seven times the width. The petioles in particular, though always 
broadly winged, are distinctly more variable than in the Chinese material. 
They vary from oblanceolate linear to spatulate oblong or elongate obcor- 
date. The largest petioles occur in a fruiting branch from Living Bridge 
(the type specimen of the subspecies in Kew Herbarium); they are spatu¬ 
late oblong, 75 to 92 by 44 to 48 mm., tapering rapidly into a marginate 
base 4 to 6 mm. long. A specimen from Moflong (in Kew Herbarium) 
has oblanceolate-linear petioles 30 to 45 by 10 to 16 mm. The other 
material is intermediate between these two extremes, and one twig from 
Myrung Wood (in Kew Herbarium) has elongate-obcordate petioles 35 
to 45 by 16 to 20 mm. in size. The blades of the leaves vary from ovate 
to lanceolate and are 35 to 65 by 14 to 40 mm.; in some specimens the 
laminae are decidedly smaller than the winged petiole, while in others 
the reverse is true. 
1 Citrus Ichangensis latipes, subsp. nov.— Citrus ichangensis afhnis, foliis acutis haud caudatis, floribus 
in paniculatis pauci-floribus (3-5) dispositis, fructibus oblatis. 
3 This is the type of the subspecies. 
3 Cf. Hooker, J. D., 1854, Himalayan Journals, London, v. 2 , p. 2S8, 292, 323. 
4 This specimen has only a lithographed label with manuscript additions. One of the twigs has extremely 
ong and slender winged petioles like the specimen from Moflung in Kew Herbarium and probably was a 
part of the same collection. The other specimens of Hooker and Thomson in Kew Herbarium have this 
same label carrying in manuscript the name “Citrus latipes H. f. and T.,” but have in addition original 
labels giving the exact locality and date of collection. 
