roLy'ivf:.MA. UMBELLIFER;E. f,33 



lanceolate caducous leaflets. Leaflets of the iuvolucel lanceolate, attenuatt; 

 into a lone; point. Flowers white; tiie petals of the exterior ones very une- 

 qual, a|)pearuitf (lf'C])ly and often in)e(|uallv •J-dcft l)y the eidart;fnicMi of the 

 lobes on eacii side of the inflcxed point. Kriiit nearly half an inch lonj;, often 

 emarginate. Vilt?e of the intervals clavate, extending otdy about half way 

 down the carpels. Commissure usually with "J vitt;e, but sometimes with 



1 or 2 imperfect ones. — H. Douirhusii, DC. was founded on a specimen 

 raised in the garden of the Horticultural Society of London, from seed 

 collected in Oregon by the late Mr. J)ouglas. H(X)ker thinks it is only a 

 variety of \l. lauatum, but Mr. Nuttall considers it a distinct species. 



34. EURYTiENIA. 



Margin of the calyx 5-toothed. (Petals unknown.) Stylopodium de- 

 pressed. Styles slender, recurved. Fruit ovate, lenticularly compressed on 

 the back, glabrous, with a narrow winged margin : dorsal ribs approxinriated, 

 filiform ; the middle one carinate or very narrowly winged ; the lateral ones 

 remote, thick and corky, united with the thin margin. Intervals filled with 

 single vitta?. Commissure with 2 very broad contiguous vitla;. Carpophore 

 2-cleft. — A glabrous herb, with 2-^3-pinnately dissected leaves; the segments 

 distant, narrowly linear, acute. Umbels terminal ; the rays numerous' 

 Involucre and involucel of several 3-5-cleft leaflets. Flowers not seen. 



E. Texana. 



Texas, Drummond ! (Coll. II. [or III.] no. 24.) — Plant apparently about 



2 feet high. Stem slender, finely striate, branching above. Cauline leaves 

 on short petioles ; the segments long and slender, scarcely half a line wide. 

 Umbel of 10-15-rays. Leaflets of the involucre and involucels cleft about 

 half way down ; the segments narrowly linear and diverging. Calyx-teeth 

 lanceolate. Fruit nearly 2 lines long, broadly ovate : dorsal ribs distinct ; 

 the 2 exterior generally appearing double or furrowed longitudinally : lateral 

 ribs much larger, obtuse, surrounding the fruit, but not extending to the edge 

 of the wing. Commissure Avith the disk almost wholly occupied by the 

 broad vitta). 



35. POLYTiENIA. DC. mem. Umh. _?;. 53, t. 13, cV prodr. 4. jj. 196. 



Margin of the calyx 5-toothed. Petals oblong, with a long inflexed emar- 

 ginate point. Fruit oval, lenticularly comjjressed on the back, glabrous, 

 with a broad and even tumid corky margin ; the dorsal disk impressed : ribs 

 obscure, nearly immersed in the corky pericarp. Intervals with 2 vittae. 

 Commissure with 4-6 vittae ; the thickened corky margin also filled with 

 resiniferous tubes. Carpophore free, 2-cleft. Seed plano-convex. — A glab- 

 rous herb, with bipinnately divided leaves; the v, ipermost opposite and 

 often 3-clefr. Umbels terminal and opposite the leaves. Involucre none. 

 Involucel of several setaceous leaflets. Flowers bright yellow. 



T^P. NuttaUii (DC. 1. c). — Ferula Drummondii, Hook Sf Am. in compan. 

 to hot. mag. p. 47 .'' 

 p. Itevis : stem smooth or very nearly so. 



Prairies and barrens of the Western States^ Indiana ! to Louisiana : west 



80 



