DiscoPLEURA. UMBELLIFER;E. G07 



prodr. 4. p. 105. Sium nodlflorum, Linn. spec. 1. p. 251 ; Walt. Car. p. 

 115 ; Ell. sk. 1. p. 355. 



Wet places, very abundant around Cliarleston, South Carolina : prol)a- 

 bly introduced from Europe. Stem weak, dilliise, about 2 feet Ion;;;. I']>per 

 leaves freciuently lernate ; leaflets acute. Involuero 1-3-leaved, sometimes 

 wanting : leaflets lanceolate, reflexed : involucels G-8-leaved. Elliott. — We 

 have seen no specimens of this plant from any part of North America. 



2. H. ? Califomicum (Hook. & Arn.) : procumbent ; leaves pinnately di- 

 vided ; segments 8-10, ovate, acute, incisely serrate ; the lower ones piimatitid 

 or j)innate, with few segments; umbels lateral and terminal; involucres and 

 involucels many-leaved ; styles elongated. Hook. &f Arn. bol. Beechey, 

 p. 142. 



California, Cai^t. Beechey. — Habit of H. n^pcns of Europe, but is much 

 larger, with more numerous and more divided piim;e. It appears to depart 

 from the generic character in having several leaves to the involucre and a 

 long stj'le. The fruit is essentially tlie same in both. Hook, d^* Arn. 



§ 2. Leaves ternatebj or hipinnately divided : involucre and involucels none : 

 fruit glabrous. — Cycloseermum, DC. 



~J- 3. H. leptophj/lltan (DC.) : glabrous, diffuse or somewhat erect ; leaves 

 temately divided with narrowly linear segments; cauline ones subsessile ; 

 umbels opposite the leaves, subsessile ; primary rays 2-3 ; partial umbels 

 pedunculate ; involucres and involucels none. — DC. I mem. soc. Genev. 4, i^' 

 prodr. 4. p. 105. Sison Ammi, Linn. spec. 1. p. 252, ex DC. Pimpinella 

 leptophylla, Pers. syn. 1. p. 324. iEthusa leptophylla, Spreng. Umh. prodr. 

 p. 22 ; ^Nutt. ! gen. 1. p. 190. 



/?. 7 latifolium : segments of the leaves broader. — Hook. S^- Arn. hot. 

 Beechey, suppl. p. 347. 



Alluvial soils, Louisiana, Dr. Hale ! Dr. Riddell ! Drummond ! 6cc. 

 Arkansas, Nuttall! P. California, Douglas. — (I) Stem 6 inches to 2 feet 

 long, often divaricate, slender. Segments of the leaves almost capillary. 

 Pedicels i-i inch long. Fruit about the size of a mustard seed. 



8. DISCOPLEURA. DC. mem. Umh. p. 38, t. 8 <^-9. 



Caly^-teeth subulate, persistent. Petals ovate, entire, vnth a minute in- 

 flexed point. Fruit ovate, somewhat didymous. Carpels with the 3 dorsal 

 ribs filiform, prominent and rather acute ; the 2 lateral ones united with a 

 thick corky accessory margin. Intervals with single vittse. Carpophore 

 bifid. Seed somewhat terete. — Annual glabrous (North American) herbs. 

 Leaves much dissected, with setaceous segments. Leaflets of the involucre 

 pinnately 3-5-parted, or nearly entire. Flowers while. 



—f—\. D. capillacea (DC.) : erect or procumbent ; umbels 3-10-rayed ; leaf- 

 lets of the involucre 3-5, usually 3-cleft ; fruit ovate. — DC ! I. c. t. 8, A, S{ 

 prodr. A. p. 106. Ammi majus, Walt.! Car. j^- 113, notofL//in. A. capil- 

 laceum, Michx.! ft. 1. p. 164 ; EU. sk. 1. p. 349; Nut(. ! gen. 1. p. 179. 

 Sison capillaceus, Spreng. ! in Schult. syst. 6. p. 411 ,* Torr. ! Jl. 1. p. 306. 



&.? coslata (DC.) : larger; stem simple below; segments of the leaves 

 somewhat verticillate ; involucre 10-12-leaved ; fruit deeply sulcate. DC. 

 I. c. t. 8, B. Ammi costatum. Ell. sk. 1. p. 350. 



Brackish swamps, rarely far from salt water. Long Island ! to Georgia ! 

 0. Swamps on the Ogeechee River, Georgia, Elliott. July-Oct. — About a 



