2 
Journal of Agricultural Research 
Vol. I.No.i 
The director of the Arnold Arboretum, Prof. C. S. Sargent, has very 
kindly turned over to the writer all this valuable material. Thanks are 
also due to Mr. E. H. Wilson for furnishing very full notes about his 
specimens and for his observations on the use of this species as a substitute 
for the lemon. 
In China this species occurs in an undoubted wild state in the hills of 
the Upper Yangtze Valley from Ichang west and southwest in Hupeh, 
Szechwan, and Kweichow, 
growing at altitudes of 
1,500 to 6,000 feet. In 
Assam a closely related 
but slightly different form 
is found at an altitude of 
5,000 to 6,000 feet in the 
Khasi Hills. Doubtless 
other similar forms occur 
to the eastward in that 
province and in Upper 
Burma as well. The spe¬ 
cies thus ranges over a 
region at least 1,500 miles 
long and some 500 miles 
wide. 
This plant is reported 
in all parts of its range as 
growing in a truly wild 
state and is cultivated on a 
small scale around Ichang 
along the Yangtze River, 
where the fruit is called 
the “Ichang lemon” by 
foreigners. 
TECHNICAL DESCRIPTION OF CITRUS ICHANGENSIS 
Fig. 2 .—Citrus ichangensis , n. sp.: Fruit showing the very low, 
broad, apical papilla circumscribed by a shallow furrow; from 
a paratype in the National Herbarium; E. H. Wilson No. 4736; 
natural size. (Drawn by J. M. Shull.) 
Citrus ichangensis is strikingly unlike any other Citrus native to China 
and is easily distinguished from all its congeners. Its technical descrip¬ 
tion is as follows: 1 
i Citrus ichangensis, sp. nov.—Citrus foliis augustis, latitudine 4 plo vel 6 plo longioribus, petiolis 
atealatis, obovatis vel oblongis ad basin abrupteattenuatis, laminis ovato-acuminatis, vix petiolis aequanti- 
bus, fioribus grandibus, 5-meris, staminibus 20, connatis, polyadelphiis, seminibus numerosis, grandibus. 
Frutex vel arbor 1-10 metralis (plerumque 1-5 met.); rami juniores angulati saepespinosisimi, 2-4 mm. 
diameter. Folia angusta, 60-135X15-33 mm . (plerumque 80X115-10-30 mm.), petiolis late alatis, laminis 
saepe aequantibus vel superantibus, obovatis ellipticis vel oblongo-spathulatis ad basin abrupte attenuatis, 
apice regulariter rotundatis vel truncatis vel subcordatis; laminis ovato-acuminatis plus minusve caudatis 
apice leviter emarginatis, ad basin regulariter rotundatis vel obtuso-cuneatis. Flores grandes, 20-35 mm. 
diam., 5-meri, solitarii, axillarii; pedicellis 3-5 mm. longis, calycibus sepalis crassis subtriangularibus, 
3X3 mm., margine minute ciliatis; petalis oblongis 15-20X5-8 mm., staminibus 20, connatis,usque ad 
apicem cohaerentibus, polyadelphiis in fasciculis 3-5, 8-10 mm. longis, stylis 3-4X1^ mm., caducis; stig- 
matibus 2-2mm. longis, 3 mm. latis ovariis paullominoribus, ovariis 3X3 mm., 8-n-locularibus. Fructus 
grandis, 7-10 cm. X9-10 cm., ovalis, ad basin tuberculato-sulcatus, apice cum papillamagna vix prominenti, 
sulco circulari plus minusve 25 mm. diam. circumdata, cortice crasso 7-9 mm. diam.; segmentis 8-11, pulpa 
vesiculari acida, seminibus grandibus 15-20X10-14X7-11 mm. ovato-aeutis, polyembryonicis, 40-70 in 
fructusingulo. 
