124 



and mcysly acuminate, 2 to 5 inches long (lower leaves sometimes 

 submersed and finely dissected, as in the next ): umbel many-rryed; 

 rays 1 to Ij^ inches long; pedicels 1 to 8 lines long: fruit li4 lines 

 long, with prominent ribs: oil-tubes 2 to 6 on the commissural 

 side. (Fig. 148.) — vS". linearc Michx. Y\. \. 1<)7. Aphnii I'meare 

 Henth. cS: Hook. Gen. Plant, i. 888 and 898. 



Apparently throughout Noith America. 



The forms with submersed dissected leaves are from S. Illinois 

 {Srhneck). Wisconsin (La}th<im), and Turtle Lake, Mt. Desert iRedfiela). 



2. S. Carsonii Durand, Gray's Manual, 196. Weak, 1 to 

 2 feet high: leaflets 1 to 3 pairs, linear, sharply serrate. 1 to 2 inches 

 long; when submersed or floating, very thin, ovate to oblong, 

 usually laciniate-toothed or dissected, the leaf sometimes reduced 

 to the terminal leaflet: umbel fewer (10 to 15)-rayed; rays about 

 an inch long; pedicels 1 to 8 lines long: fruit smaller, about a line 

 long, with less prominent ribs: oil-tubes 2 to 4 on the commissural 

 side. (Fig. 144.) — Apium Carsonii Benth. & Hook. 1. c. 

 Pennsylvania, Connecticut, Rhode Island, and Massachusetts. 



46. APIUM Linn. Gen. n. 867. — Erect or prostrate gla- 

 brous herbs, with pinnately or ternately divided leaves, and umbels 

 of white flowers opposite the leaves. 



1. A. leptOphyllum F. Muel., Benth. Fl. Austral, iii. 872. 

 A few inches to two feet high: leaves ternately divided into 

 filiform segments: umbels sessile or short-pedunculate: Iruit a 

 line long. (Fig. 145.) — Helosciadium leptophyllum DC. 



Florida to Texas, extending north to "St. Louis" (NuttaU), and south- 

 Wfstward into Mexico. A very much reduced form (2 to 3 inches high) was 

 collected by Martindale near Long Branch, N. J., August, 1S(;4. 



A. NdDiM.OKUM i3enth. & Hook., an introduced species from 

 Europe, was reported first by Walter as very abundant around 

 Charleston, JS. C, but was not afterwards found until recently col- 

 lected by Dr. J. H. Mellichamp. It has also been found on ballast 

 near Philadelphia liy Martindale. It grows in wet places, and 

 has simply pinn.ite leaves, the leaflets being oblong and serrate. 



A. GUAVEoi.ENS L., the common garden celery, is a native 

 of the coasts of Europe, but has become widely naturalized, being 

 reported from California, in salt marshes from Santa Barbara to 

 San Diego, also from San Bernardino {^Parish) and Ft. Tejon; 



