COULTER AND ROSE—NORTH AMERICAN UMBELLIFERAE. 119 
cral bracts, fruit ribs, and shorter styles of P. capillaceum, and the stouter habit, 
smaller fruit, and larger calyx teeth of P. nuttallii, 
A form collected in swamps near Wilmington, N. C. (McCarthy, July-August, 
1885), probably represents Ammi costatum Ell. Sketch 1: 350, 1821 ( Discopleura capil- 
lacea costata DC. Coll. Mém. 5: 39. pl. 8. fig. B. 1829, and D. costata Chap. Manual 
162. 1860). It is a much stouter plant, reported to become 12 to 15 dm. high; the 
leaf segments are very numerous and crowded and appear verticillate. The absence 
of fruit, however, prevents us from examining the more essential characters. 
Elliott’s statement that 7. capillaceuin is a low and spreading vernal plant, while his 
Ammi costatum is a tall and erect autumnal plant, furnishes good characters, if ten- 
able. Our specimens of both, however, show nothing strikingly different in the 
spreading or erect habit, or in season; and in the absence of fruit we have nothing 
but size to distinguish the two forms. The figure of the fruit of costata given by 
De Candolle does not suggest any material difference from P. capillaceum. 
2. Ptilimnium nuttallii (DC.) Britton, Mem. Torr. Club 5: 244. 1804. 
Discopleura nuttallii DC. Coll. Mém, 5: 38. pl. 9. 1829. 
Discopleura capillacea nuttallii C. & R. Bot. Gaz. 12: 292. 1887. 
Resembles 7. capellaceum, but stouter, 6 to 9 dm. high; rays more 
numerous; involucral bracts entire, and involucels of smaller bract- 
lets; fruit ovate, 1 to 1.5 mm. long, somewhat constricted beneath the 
more prominent calyx teeth; stylopodium more prominent, and styles 
longer and recurved; dorsal and intermediate ribs more prominent, 
nearly equaling the laterals, which are distinct and do not form a 
broad flat band. 
Type locality, *‘in North America at Red River,” collected by Wut- 
tall; type in Herb. DC., duplicate in Herb. Philad. Acad. 
In swamps, from southern Illinois to Alabama and ‘Texas. 
Specimens examined: 
Inurors: Jackson County, French, July 11, 1878. 
Missourt: Allenton, Letterman, in 1881. 
ARKANSAS: Fort Smith, Bigelow, in 1853-54; near Little Rock, Mrs. M. H. Taft, 
in 1888. 
ALABAMA: Northern Alabama, G. /t. Vasey, in 1878. 
InpiAN Territory: Palmer 149, in 1868; Sheldon, June 13, 189, 
Texas: Hempstead, fa// 243, June 16, 1872; Sherman, Mrs. M. L. Nash, in 1888; 
Fort Worth, Dewey, June 8, 1891. 
3. Ptilimnium laciniatum (Engelm. & Gray) Kuntze, Rev. Gen. PI.1: 
269. 1891. 
Daucosma laciniatum Engelm. & Gray, Bost. Jour, Nat. Hist. 6: 211. 1850. 
(Pl. Lindh.) 
Erect, 6 to 9 dm. high; leaves dissected into lanceolate divisions, or 
the uppermost linear-setaceous; umbel nearly equally many-rayed with 
involucre and involucels of numerous 3 to 5-parted setaceous bracts; 
rays 1 to 3. cm. long; pedicels 4 to 6 mm. long; fruit oblong, about 4 
mm. long, with broad and flattish dorsal and intermediate ribs, the lat- 
erals forming a prominent acute ridge about the fruit; calyx teeth 
small; styles recurved, longer than the stylopodium; seed face plane. 
Type locality, ** high valleys near New Braunfels and on the Upper 
