) 











1909] NELSON— PLANTAR GOODDINGIANAE 435 



scientific imagination too far; therefore, I suggest the recognition of the 

 genus Lebetina, with at least the species named below. These species 

 in habit and habitat and in most essentials of structure are in close 

 accord, the first being exceptional in having an extra series of paleae, 

 and the first and second in that the style appendages are abruptly 

 instead of gradually acuminate. The characters of the genus can 

 be obtained from the description of the section Eudysodia and its 

 subdivisions, as cited above, and in Syn. Fl. 1:356. 1884. 



Rather than leave these species in Dysodia, it were better to trans- 

 fer them to Porophyllum Vaill, or to Nicolletia Gray, in either of 

 which less violence would be done so far as appearance gives any 



clue to general conformity. 



Lebetina cancellata Cass. — Dysodia cancellata Gray, /. c; 



and Hoffmann, I. c. 



Lebetina porophylla, n. comb.— D. porophylla Cav., Anal. Cienc. 

 4:334; D.C. Prodr. 5:639; not D. porophylla Willd., Enum. 900. 



Lebetina speciosa, n. comb.— D. speciosa Gray, Proc. Am. Acad. 



5:163. 1861. 



Lebetina porophylloides, n. comb.— D. porophylloides Gray, 



Mem 



and Bot. Cal. 1:397- l886 - 



Lebetina Cooperi, n. comb.— D. Copperi Gray, Proc. Am. Acad, 

 9:201. 1874; and Bot. Cal. 1:397- 1885. 



The collection of this last species by Mr. Goodding (no. 2246, Mesquite Well, 

 Nevada) led to a study of this group, which has convinced me that Dysodia 

 will receive further segregation, though it may at the same time be expanded in cer- 

 tain other directions. Hoffmann has thus referred Thymophylla Lag. (Hymai- 

 athcrum Cass.), and has found it necessary to change the genenc description in 

 no essential character. For that reason the following may be referred to Dysodia. 



Dysodia cupulata, n. sp.-Herbaceous perennial, from slender 

 woody roots; puberulent on stems and leaves; foliage and involucre 

 more or less beset with small round oil-glands; branching below: 

 stems slender, less than i dm high, very leafy; branches terminating 

 in a filiform naked monocephalous peduncle 2- 4 cm long: leaves 

 opposite below, pinnately parted into 3-5 filiform acerose lobes 



long: involucres broadly campanulate or cup-shaped, about 



1 or 2 



< mm h>h and broad; bracts about 16, completely united, 

 minute "free bracts at base: rays about 12; ligule elliptic-oblong, 



