OF ARTS AND SCIENCES. 287 



Aspidistrece. The Asparagineous tribes proper (with 180 species) 

 are not represented in America, but are peculiar to Africa (with the 

 Mediterranean region), Australia and Southern Asia, only such out- 

 lying genera as Astelia, Luzuriaga and Herreria occurring in South 

 America. The Nolinece may be considered as taking their place in 

 North America. 



The Hemerocallidece (36 species), of the same Old World region as 

 the Asparaginece, are represented in America by the one species of 

 Hesperocallis in Arizona, which may be included in the tribe not- 

 withstanding the anomalous character of the seeds and root. The 

 TuccecB, of Mexico and the adjacent warm dry region of the United 

 States, in like manner replace the Aloinece and Sansevierece of Africa 

 and Southern Asia. 



The Liliaceous tribes are in general very polymorphous in their 

 characters. The principal one, the Liliece (of 205 species), which is 

 peculiar to the northern temperate zone and with four of the seven 

 genera common to both continents, may be divided into nearly as 

 many subtribes as genera. Lloydia and Gagea, chiefly Asiatic, in 

 some respects resemble the Phalangiece, while Cdlochortus, of Califor- 

 nia and Mexico, and including several well-marked subgenera, is 

 differentiated even more widely in the direction of the Melanthacece. 

 In the southern hemisphere the only approach to this tribe is found 

 in the Philesiece of two monotypical genera in Chili and Patagonia. 



The tribe Uvulariece, of a dozen small genera and about 40 species, 

 is more widely distributed in its types, inasmuch as besides the seven 

 genera of temperate North America and Asia (one species of Streptopus 

 ranging westward from America to Central Europe), Africa and S. 

 Asia have a representative in the genus Gloriosa, Australia in 

 Burchardia and its allies, and Chili in Callixene. The division of 

 Uvidaria itself, which seems to be required, affords an opportunity to 

 honor the memory of the lamented botanist, Mr. William Oakes, 

 whose persistent zeal in investigating the flora of the fields and 

 mountains of his native New England makes appropriate the union 

 of his name with one of the plants which he himself knew so well. 



The Trilliece are a small tribe exclusively northern, the principal 

 genus Trillium American (with one species entering E. Asia) but 

 represented in Asia by two nearly allied genera, Paris and Trillidium, 

 of which the first also occurs in Europe. Less near are the two other 

 genera Medeola and Scoliopus, which occupy respectively the eastern 

 and western coasts of North America. The tribe has no counterpart 

 in the southern hemisphere. 



