576 swingle: new genus of citrous fruits 



ported. There can be no reasonable doubt that this material is the 

 round-fruited Australian lime, though the flower must have been ab- 

 normal, as the number of stamens usually runs about 16-20 or some- 

 times a few less by reduction. Unfortunately no adequate description 

 of Cunningham's Limonia australis seems ever to have been published, 

 so his name cannot be used. 



Between 1854 and 1858 Planchon described Citrus australis, stating 

 expressly that it was based on ''an imperfect specimen of Leichardt's 

 preserved in the Museum d'histoire naturelle at Paris." 



In June, 1911, the writer found two sheets of Leichardt's material, 

 collected at Moreton Bay in 1845, in the herbarium of the Paris Mu- 

 seum, one a small twig with a flower, the other a branched leafy twig 

 with no flowers or fruits but having pasted on the sheet a note by the 

 collector and an analysis by Baillon,* reading ''Calyx 5-dent. petala 5, 

 stamina plura, filam. liberis." A pencil drawing of the pistil in profile 

 and in section by A. G. [A. Guillaumin] shows the ovary to have 7 

 cells. No flower is now found on this sheet. Planchon speaks of the 

 "flore unico effoeto," so he must have seen only an imperfect specimen. 

 Possibly the flower has been lost or is the one preserved on the second 

 sheet. The leaves of this specimen are cuneate-obovate, 2.5-5 cm. 

 long by 1.5-3.2 cm. broad, and rounded or blunt-pointed at the apex. 



It is difficult to place this material, as it is somewhat intermediate 

 in appearance between the two species common in the Moreton Bay 

 region. For this reason the application of the name must for the pres- 

 ent remain somewhat doubtful, though possibly a careful study of the 

 Paris material would decide to which species it belongs. 



A later name. Citrus Planchoni F. Muell., published in 1872, un- 

 doubtedly applies to the round-fruited species. 



The dooja reaches a height of 9-18 meters (30-60 ft.) and bears 

 fruits 2.5-6.5 cm. or even 7.5 cm. in diameter; the juvenile leaves are 

 often very narrow, even linear in shape, not oval or ovate as in the fin- 

 ger lime, and are borne on slender, rather flexuose branches. The grow- 

 ing shoots and immature leaves on vigorous plants grown in the open 

 are deep wine-red in color. The spines, at least in greenhouse speci* 

 mens, are often minutely puberulent toward the base. Unlike the 

 finger lime, which flowers and fruits when only a few years old, the 

 dooja rarely ever flowers and fruits in greenhouse culture. 



* Fide Beauvisage, G. Genera Montrouzierana Plant. Nouv. Caled., in Ann. 

 Soc. Bot. Lyons, 26: 12. 1901. 



