154 COULTER AND ROSE 



Deanea are comparatively small and even delicate, smooth plants, 

 with leaves of moderate dimensions ; while those of Prio7iosciadiu?n 

 are large and coarse plants, with very large leaves, which in some 

 species are thickish and rough. 



In his presentation of the Umbellif erae in Engler & Prantl's Natur- 

 lichen Pflanzenfamilien^ Drude regards Deanea as not generically 

 distinct from Rhodosciadiu7n Wats., and transfers to the latter the two 

 species of Deanea then published. In our judgment Deanea is in 

 much greater danger of confusion with Prionosciadium^ as stated 

 above, than with Rhodosciadiiim^ whose remarkably flat seed-face is 

 entirely unlike the deeply sulcate or involute one of Deanea. The 

 genus is further strengthened by the discovery of the five additional 

 species herein described, all of which accord with the essential features 

 of Deafiea as established. 



Synopsis of the Species. 



Plants with globose tubers and pinnately compound leaves. 



D. tuberosa. 

 Plants with branching roots and ternately compound leaves. 



Rachis of leaves conspicuously winged D. glauca. 



Rachis of leaves not at all winged. 



Inflorescence comparatively simple, with elongated peduncles; 

 fruit small, orbicular, 5 to 8 mm. in diameter. 



D. midicaulls ; D. longibracteata. 

 Inflorescence widely spreading and irregular, with shorter pe- 

 duncles; fruit large, oblong, 12 to 18 mm. long and 8 to 10 

 mm. broad D. diffusa; D.inoiitana; D. nelsoni. 



1. Deanea tuberosa C. & R. Bot. Gaz. 20: 373. 1895. 

 Rhodosciadium tuberosum Drude, Engler & Prantl. Nat. Pflanzfam. 38: 223. 



1898. 

 State of Mexico: Valley of Toluca, Pringle ^2g^, in 1892. 



2. Deanea nudicaulis C. & R. Bot. Gaz. 20: 372. pi. 2/. 1895. 

 Rhodosciadium nudicanle Drude, 1. c. 



Involucels very small ; fruit 5 mm. in diameter. 



Oaxaca : Sierra de San Felipe, Pringle 4663, in 1894, and Con- 

 zatti & Gonzalez 224 and 41 S, in 1S97. 



3. Deanea longibracteata C. & R., sp. nov. 



Stems 6 to 9 dm. high, glabrous, somewhat branching ; leaves twice 

 to thrice ternate ; leaflets ovate to oblong, obtuse, irregularly cleft or 

 toothed, slightly roughened on the veins ; inflorescence simple, ter- 

 minal or lateral, umbel on an elongated peduncle 3 dm. or less long; 

 involucre a single bract or wanting; bractlets of the involucel 4 to 6, 

 linear, elongated, much longer than the flowers ; rays numerous, in 

 fruit 7.5 to 10 cm. long, slightly scabrous as are also the pedicels: 



