UMBELLIFER^. 155 



1. L. dissecta, Nutt. Leafy at base, 1 3 ft. high: leaves broad, 

 1 ft. long, ternate and thrice pinnate; segments ovate or oblong, % 1 

 in. long, laciniate-pinnatifid and toothed, puberulent on the veins beneath 

 and along the margins: umbel 8 20-rayed, involucrate with few linear 

 bracts, the bractlets of the involucels more numerous: fl. yellow or 

 purplish: fr. sessile or nearly so, 5 9 lines long, about 3 lines broad: 

 seed face plane. On dry hills. 



18. PEUCEDANUM, Theophr. Perennials of diverse habit, ours 

 mostly low and subacaulescent, with fusiform root. Leaves ternately or 

 pinnately dissected. Involucre 0: involucels usually present. Flowers 

 white or yellow. Calyx-teeth obsolete or manifest. Fruit strongly 

 flattened dorsally, oblong to suborbicular, glabrous or tomentose; carpel 

 with dorsal and intermediate ribs filiform and approximate, the lateral 

 ones developed into a broad thin wing which until maturity is coherent 

 with that of its companion carpel, forming a broad scarious wing to the 

 fruit as a whole. Oil- tubes 1 8 in the intervals, 2 10 on the face. 



* Stout; leaves finely dissected; fruit-wings broad; fl. while. 



1. P. eurycarpum, C. & E. Boot tuberous-enlarged: stem 1 2 

 ft. high, branching, pubescent: leaves subdivided into countless small 

 linear cuspidate segments: umbel 3 12-rayed, with involucels of lanceo- 

 late acuminate often united bractlets; rays % 4 in. long; pedicels 1 5 

 lines: fr. glabrous, 5 9 lines long, broadly elliptical, the wings as broad 

 as the body or broader, the ribs filiform; oil-tubes large, solitary in the 

 intervals, 2 on the face. Plains and hills of the interior. 



2. P. dasycarpum, Torr. & Gray. Subacaulescent from a fusiform 

 root, tomentose-pubescent: leaves small, with countless short linear 

 segments: peduncles stout, ^ 1ft. high; umbel 6 12-rayed; involucels 

 of linear-lanceolate more or less tomentose bractlets; rays 1 3 in., 

 pedicels 3 5 lines long: fr. nearly orbicular, 47 lines long, nearly 

 glabrous or coarsely pubescent, the thin scarious wings broader than the 

 body: oil-tubes large, usually solitary in the intervals, 4 on the face: 

 seed deeply sulcate under the oil-tubes. In the interior. 



3. P. tomentosnm, Benth. Subacaulescent, more or less densely 

 villous-tomentose and purplish: leaves cut into very small filiform or 

 very narrow segments: peduncles 1 ft. high or more: umbel of 48 

 equal rays 13 in. long; involucels of linear-lanceolate or ovate-acumi- 

 nate bractlets: calyx-teeth manifest: fr. ovate to orbicular, 5 9 lines 

 long, densely tomentose; wings rather thick, from somewhat narrower to 

 even broader than the body, the prominent ribs concealed by the tomen- 

 tum: oil-tubes mostly 3 in the intervals, 4 on the face. Common on 

 bushy hills and open plains. 



