May 25,19x4 
Eremocitrus 
99 
man, 1914), also closely related to Citrus, has lately been described 
from tropical Africa and also by the recent discovery of a new and 
curious species of Citrus (Swingle, 1913), growing wild at higher alti¬ 
tudes and farther north than any other previously known species of 
the genus. 
The citrous fruits are perhaps the most interesting and in many ways 
the best known of all our fruits, so that the surprising lack of knowledge 
as to the wild relatives of Citrus is doubtless duplicated in the case of 
many other commonly cultivated plants. Until these neglected botan¬ 
ical resources are brought to light and rendered available to the experi¬ 
menter by critical taxonomic study it is not possible to undertake the 
improvement of our crop plants in the most rational and effective way. 
This hybridizing of our crop plants with their wild relatives is a work of 
the greatest moment at the present time, when the constantly increasing 
cost of food directs attention to the necessity of extending agriculture 
by bringing under culture lands too dry, too wet, too salty, too poor, or 
situated in climates too hot, too cold, or too variable for the culture of 
the crop plants as they now exist. 
LITERATURE CITED 
Bailey, F. M. 
1895. Peculiarities of the Queensland flora. In Queensland Dept. Agr. Bot. Bui. 
12, p. 11-26. 
Campbell, W. S. 
1899. Some western plants. Useful, ornamental, and curious. In Agr. Gaz., 
N. S. Wales, v. 10, pt. 11, p. 1167-1169, 10 fig. 
Gregory, A. C. 
1857. North-Australian exploring expedition. Third letter, Sydney, 7th Janu- 
ary, 1857. In Hooker's Jour. Bot. Kew Gard. Misc., v. 9, p. 231-243. 
Leichhardt, Ludwig. 
1847. Journal of an Overland Expedition in Australia, from Moreton Bay to 
PortEssington , . . during the years 1844-1845. 544P,, pi., 3 maps. 
London. 
Maiden, J. H. 
1888. Australian indigenous plants providing human foods and food adjuncts. 
In Proc. Linn. Soc., N. S. Wales, s. 2, v. 3, pt. 2, p. 481-556. 
1889. The useful Native Plants of Australia (including Tasmania). 696P. London. 
Mitchell, T. L. 
1848. Journal of an Expedition into the Interior of Tropical Australia, in Search 
of a Route from Sydney to the Gulf of Carpentaria. 437 p., illus., maps. 
London. 
Mueller, Ferdinand. 
1857. Notes made during the recent expedition across the northern portion of 
Australia, under the command of Mr. Surveyor Gregory. In Hooker's 
Jour. Bot. Kew Gard. Misc., v. 9, p. 165-173, 193-199, 225-230. 
1858. Botanical report on the North-Australian expedition, under the command 
of A. C. Gregory, Esq. In Jour. Linn. Soc. [London], Bot., v. 2, p. 137-163. 
