Archkmora. UMBELLIFKR/E. (;3l 



and west to Louisiana. Au/i^.-Sejit. — Stem 'J-fi feet hii^li, rrort, fistulous, 

 branching abovp. Leaves, or rather iictiolos, ■l->i inehes lon^ and 'J— 1 lints 

 in diameter, tajjering to the sununit, (hvidc<l l)v tuiinerous transverse nieni- 

 l)raiioMs partitions. Principal umbel of 10-15 slrndcr rays. Fruit about 3 

 lines long, " the vitta; tilling the dorsal intervals." J)C. 



31. ARCHEMORA. DC. mem. Umh. p. 53, S^- prndr. 4. ;>. 1H8. 



Margin of the calyx 5-toothed. Petals obcordate, with an inflexcd point. 

 Fruit lenticularly compressed, oval or obovate. Carpels with 5 fililt^rm 

 obtuse ai)proximated equidistant ribs; the lateral ones dilated into a llritlish 

 margin nearly as broad as the disk. Intervals with single large vitlfi'. 

 Commissure with 4-G vitta^. Carpoj)liorc 2-parted. Seeil Hat. — Perennial 

 glabrous herbs (natives of the United States), growing in swamps. Leaves 

 pinnately or temately divided ; the segments entire or remotely toothed. 

 Involucre none, or few-leaved. Involucels of numerous leaflets. Flowers 

 while. 



-i— 1. A. rigida (DC.) : leaves j)innatcly divided. 



a. segments of the leaves ovate, oblong, or lanceolate, remotely toothed or 

 denticulate, often entire. — A. rigida, tricuspidata, 6c dcnticulata, DC. ! 

 prodr. 4. p. 188. A. rigida, Darlingt. Jl. Ccst. p. 195. Slum rigidius, 

 Linn.! spec. I. p. 251. S. rigidius, triciis])idatum & denticulatum. Ell. sk. 

 1. p. 354. Sison marginatum, Michx. ! ji. 1. p. 1G8. Gi^nanlhe rigida, 

 Nutt..' gen. \. p. 189. Pastiuaca rigida, Sprcng. in SchuLt. syst. 6. p. 586; 

 Torr.! Ji. l.p.314. 



(i. segments of the leaves linear, elongated, mostly entire. — A. ambigua, 

 DC! I.e. Slum longiiblium, PMr,s/i, jl. 1. p. 194. CEnantlie ambigua, 

 Ntitt. ! I. c. Paslinaca ambigua, Spreng. I. c. ; Torr. ! I. c. 



Swamps, Michigan ! New York ! to Florida ! and to Louisiana I Sept. 

 — Stem 2-5 feet high, erect, slender, terete. Leaves usually with 3-5 psurs 

 of segments, sometimes willi 2, or even a single pair, variable in lorm, occa- 

 sionally obovate, but more commonly oblong-lanceolate, somewhat rigid, and 

 the margin cartilaginous ; in var. a. more or less toothed ; the teeth often 

 very large, and sometimes reduced to two near the summit, or suiall and 

 scaltereil. Umbel of many slender rays. Fruit 3 lines long ; the dorsal 

 ribs slightly elevated and greenish ; the lateral ones united with the rather 

 thin white and somewhat corky margin. Vitta3 dark purple, filling the in- 

 tervals. Commissure white. 



2. A. ternata (Nutt. mss.) : " leaves ternately divided, with very long 

 petioles; segments linear. — Peucedanum ternatum, Nutt. gen. 1. ;?. 182; 

 DC. jnodr. 4. p. 182. 



" Margin of swamps in the pine forests of North and South Carolina ; not 

 uncommon near Ncwbern. — Stem 2-3 feet high, slender. Leaves few; the 

 petiole of the lowermost nearly 2 feet long ; segments ])etiolidate, or 

 filiformlv attenuated downwards, 4-6 or 8 inches long, and scarcely 3 lines 

 wide. Rays of the umbel 6-9, elongated. Pedicels (frtictilerous) more 

 than an incli long. Mature fruit as large as that of a parsneji (Pnstinaea 

 sativa), surrounded with a thick winged somewhat fungous margin, which is 

 continued internally over the whole commissure, and conceals the 4 vitta?. 

 Wing of the carpels about half die breadth of the dorsal disk. Flowers not 

 seen." Nult. I. c. Sf mss. — It is singular that no specimen of this plant ha» 

 yet reached us. 



