swingle: new genus of citrous fruits 575 



glands also are said to be larger; and the fruit is broader and has a 

 rougher skin than the ordinary finger lime. Seedlings grown in the 

 greenhouse of the Department of Agriculture at Washington, D. C, 

 from seed collected in the type locality in Queensland, show the same 

 peculiar juvenile growth as the ordinary finger lime; that is, several 

 tiers of very spiny small-leaved branches spread out horizontally be- 

 fore a few upright branches at length arise. The twigs are more slen- 

 der and the upright branches more flexuose than in the typical M. 

 australasica. 



It is a still a matter of doubt to the writer whether this is a valid 

 species or merely a geographical form of the finger lime. 



THE DOOJA OR AUSTRALIAN ROUND LIME 



The round-fruited Australian lime, native to the subtropical coast 

 forests of New South Wales and Queensland, is generally referred to 

 Citrus australis Planchon. 



3. Microcitrus australis (Planchon) Swingle. 



Limonia australis A. Cunn. in Sweet, Hort. Brit. ed. 3, 91. 1839 



{noynen subnudufn). 

 Citrus australis Planchon, Hort. Donatensis, 18. 1854-58. 

 Citrus Planchoni F. Muell. Australian Vegetation Indigenous or 

 Introduced, etc., in Intercolonial Exhibition Essays 1866, 5 and 23. 

 1867 (no7nen subnudum); Proc. Zool. Acclim. Soc. Victoria, 1: 282. 

 1872. 

 Type locality: ''Nouv. HolL," Moreton Bay Region, Queensland, 

 Australia. 



Illustration: Penzig, Studi bot. sugli Agrumi, in Annali di Agric. 

 No. 116, 210-214, vl. 21, figs. 8-12. 1887. 



The round fruited Australian lime or dooja, as it is called by the 

 aborigines, is one of the most interesting but at the same time one of 

 the least known of the Australian citrous fruits. As early as 1827 Allan 

 Cunningham collected a fruiting branch of this species on the Brisbane 

 River. This specimen is preserved under his number 163 in the Brit- 

 ish Museum. Another of Cunningham's specimens, preserved in the 

 herbarium at Kew, has the following label: 



"The Limonia australis (C). The "lime" of Moreton Bay. A 

 solitary flower alone found after felling many of these trees on the 

 banks of the Brisbane proves the genus to be Limonia and not Citrus, 

 the 10 stam. being all distinct." 



This sheet shows two twigs, one with a young fruit, the other with 

 leaves only, though possiblj'' it originally bore the single flower re- 



