CituTA. UMBELLTFER^E. G09 



feet liigh, with spreadinc; branches. Involucre wantinc;. Invnluccl of 2-3 

 minute leaflets. Rays of the unihel 8-14 lines long. Fruit muriratLd, as in 

 the preceding species. 



4. L. pnlcns (Nntt.) : mnrioatc with niiiiutc tul)erclo.s ; rays of the uniln-I 

 and unibelli'ls (4-d) very unccjual, erecl-sinx-adiiii,'. — Nut(..' in DC. prmlr. 

 4. ]>. 107. 



Prairies of Arkansas, Nuttall ! Louisiana, Dr. Leavenworth! Tc'xa<i, 

 Drutnmond ! — Stem \-2 feet high, branching above. Rays of tlic umbel 

 5-10 lines long, of the umbellets 2-4 lines. 



'T'S. L. ecJtinaliis (Nniu): fruit echinatc with spreading uncinate bristles; 

 rays of the umbel 4-6, of the umbellets 6-10, slightly diverging. — NuU. in 

 DC. prodr. A. p.lQU. 



Arkansas, NuUall. Texas, Drummond! About a span high; the branches 

 somewluu rigid. Rays of the umbel .5-6 lines long, of the umbellets 2-3 

 lines. Fruit armed with stifl' whitish bristles, which are distinctly uncinate. 



10. BUPLEURUM. Tourn. ; Linn.; Koch, Umb. p. 114. /". 51 cV .52; 

 DC. jfrodr 4. p. 127. 



Margin of the calyx obsolete. Petals somewhat orbicular, entire, with a 

 broad closely inflexed refuse point. Fruit laterally compressed or somewhat 

 didymous, crowned with the depressed stylopodium. Carpels with 5 ribs, 

 which are either winged, acute, filiform, or obsolete ; the lateral ones margi- 

 nal. Intervals with or without viftfc, smootli or graiuilatcd. Seed teretely 

 convex, flattish on the face. — Herbaceous or shrubby glabrous plants. 

 Leaves rarely divided, usually by the abortion of the limb and dilatation of 

 the petiole, changed into entire phyllodia. Involucres various. Flowers 

 yellow. 



1. B. ranunculoides (Linn.): radical leaves linear-lanceolate; cauline 

 ones clasping, cordate-oblong, striate; involucre about 3-leaved, unequal; 

 leaflets of the involucel 5, ovate, rnucronate, nerved, distinct. DC. — Linn, 

 spec. 1. p. 237 ; DC. prodr. 4. ^;. 131 ; Hook.fl. Bor.-Am. 1. /;. 263. B. an- 

 gulosum, Spreng.; Hook. S^ Am. hot. Bccchey, p. 124. 



Cape Mulgrave in Behring's Straits, Lay Sf Collie. 



-J- 2. B. rotundifolium (Linn.) : leaves broadly ovate, entire, perfoliate ; in- 

 ' volucre none; "involucels of 5 ovate mucroiiate leaflets; fruit with very 

 slender ribs; intervals smooth, mostly without vitt;c. — Linn. spec. 1. p. 236 ; 

 Ensl. hot. t. 99 ; Beck, hot. p. 145 ; Darlingt. Jl. Cest. p. 191. 



Fields and cuhivated grounds. New York ; Chester County, Pennsylvania, 

 Darlington ; Orange County, North Carolina, Schweinitz. — (T) Stem 1-2 

 feet high, branching. Leaves 1-2 inches long, glaucous beneath, perlbrated 

 by the^stem excenlrically. Umbels of 5-9 rays. Involucels rather longer 

 \han the umbellets. Flowers greenish-yellow.— il/o(/es/^. Thorough-wax. 



11. CICUTA. Linn. ; Lam. ill. t. 195 ; DC. prodr. 4. p. 99. 



Margin of the calyx 5-ioothed ; tlie teeth somewhat foliaceous. Petals ob- 

 cordate ; the point inflexed. Fruit roundish, laterally contracted, didymous. 

 Carpels with 5 flattish etpial ribs ; the lateral ones marginal. Intervals filled 

 with single vittffi. Commissure ^vith 2 vittae. Carpophore 2-parted. Seed 



77 



