170 swingle: a new genus of kumquat oranges 



Fruits oval or oblong, 5-7-celled; seeds more or less pointed at tip; 

 leaves narrowed toward the tip. 

 Fruits oblong, 25-33 mm. long, 20-25 mm. in diameter, usually 



5 or 6-celled; petiole narrowly margined, not winged; pulp 

 vesicles fusiform 1 . F. margarita. 



Fruits oval or subglobose, 28-35 mm. long, 22-30 mm. in diameter, 



6 or 7-celled; leaves very thick; petiole plainly but narrowly 

 winged at tip; vesicles subglobose or oval 3. F. crassifolia. 



THE OVAL kumquat 



The oval kumquat has been referred by most botanists to Citrus 

 jayonica Thunb., which is based on the round kumquat. These two 

 kumquats are certainly very closely related, but as they show con- 

 stant differences of some taxonomic importance in nearly all parts of 

 the plant, it seems best for the present to consider them as constituting 

 two distinct species. 



1. Fortunella margarita (Lour.) Swingle. 

 Citrus margarita Lour. Fl. Cochin. 2: 467. 1790. 

 Citrus aurantium olivaeformis Risso, ex Lo'sel.-Desl. & Michel, Nouv. 



Duham. 7: 95. 1816. 

 Citrus aurantium var. japonica Hook. f. Curt. Bot. Mag. III. 30: 



pi. 6128. 1874. 

 Citrus japonica var. fructu elliptico Sieb. & Zucc. Fl. Jap. 1:35. 



pi. 15, fig. 3. 1835. 

 Citrus Aurantium subspec. japonica var. globifera subvar. margarita 



Engl, in Engl. & Prantl, Pflanzenfam. 3^: 199. 1896. 



Type locality: Canton, China (in culture). 



The type specimen of Citrus margarita seems to have been lost, but 

 Loureiro's description is very good and can apply only to an oval 

 kumquat very similar to the one commonly cultivated today in all the 

 warmer parts of the world. 



A lectotype {Swingle; C. P. B. No. 7955; February 18, 1915), con- 

 sisting of a branch of an oval kumquat tree growing in a greenhouse 

 of the Department of Agriculture at Washington, has been deposited 

 in the National Herbarium at Washington. 



The oval kumquat differs from the round chiefly in the following 

 respects: (1) The leaves are larger, more acute at the base, less pallid 

 and more veiny below; (2) the ovary has usually 4 or 5 cells, very 

 rarely 3 or 6; (3) the fruit is oval, not globose; (4) the style is persistent, 

 not caducous; (5) the seeds are larger and especially longer, with a 

 rougher testa. (Fig. 2.) It differs also in being distinctly more 



