118 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Type species, Ama! capillaceum Michx. Fl. Bor. Am. 1: 164, | 1808, 
A genus of at least 8 species, belonging to Eastern United States. 
‘ 
Leaves dissected into filiform divisions, 
Involueral bracts cleft or parted; fruit 2 to 38 mm. long. ...-.--- 1. P. capillaceum. 
Involucral bracts entire; fruit 1 to 1.5 mm. long......----.------- 2. P. nuttallir. 
Leaves with lanceolate divisions; fruit large (4 mm, long) ........ 3. P. laciniatum. 
1. Ptilimnium capillaceum (Michx.) Raf. Seringe Bull. Bot. 217. 1830. 
Fig, 33, 
Ammi capillaceum Michx. Fl. Bor. Am. 1: 164. 1805. 
Discopleura capillacea DC, Coll. Mém, 5: 38. pl. 8. 1829. 
Slender and more or less spreading, 3 to 6 dm. high; leaves finely 
dissected into filiform divisions; umbel 5 to 20-rayed, with involucre 
of filiform bracts usually cleft or parted, and involucels more or less 
prominent; rays 0.5 to 38cm. long; pedicels 3 to 6 mm. long; fruit 
ovate, 2 to 3 mm. long, with filiform dorsal and intermediate ribs, the 
laterals forming a broad flat band about the fruit; calyx teeth minute; 
styles shorter than the stylopodium, sometimes very short; seed face 
convex. 
Type locality, ‘Sin campestribus Carolinae.” 
Wet meadows, mostly near the coast, from Massachusetts to Florida 
and west to Texas. 
Specimens examined : 
Massacuusetts: Nantucket, Miss F. N. Vasey, August 12, 1897. 
Connecticut: Stratford, ames, August 16, 1893. 
New York: Staten Island, Small/, July 12, 1889. 
New Jersey: Woodridge, Nash 48, July, 1889; Port Morris, J/olmes 385, Sep- 
tember 9, 1890. 
DeLaware: Kent County, Holmes 144, August, 1890. 
Marybanp: Eastern Maryland, Holmes 44, July, 1890. 
District oF CoLtumBra: Near Washington, Ward, in 1877. 
Virainia: Franklin, Southampton County, Heller 1150, July 22-29, 1893; Wal- 
nut Point, Knowlton, August 17, 1897. 
NorrH Carourna: McCarthy, July, 1885; near Wilmington, Coville, June 24, 1890; 
Rowan County, Small & Heller 65, August 13-18, 1891; southeastern North 
Carolina, Ashe. 
SoutH Carona: Aiken, Ravenel, July, 1869. 
Froripa: Near Jacksonville, Curtiss 1028, and 4341, 4918, June-July, 1893, 1894; 
near Eustis, Lake County, Nash 837, May 16-31, 1894, and 1930, May 28- 
June 15, 1895; Biltmore Terb. (Chapman coll.) 2161. 
AuaBAMA: Auburn, Lee County, Pollard & Maron 57, July 9, 1900. 
Mississippi: Madison, Phares, in 1883; Ocean Springs, Miss AY Skeehan, June 15, 
1890. 
Texas: Hempstead, Hall 247, June 12, 1872. 
The following forms differ in certain respects from P. capillacenim as defined above 
and may or may not deserve recognition as varieties or species. Field study and a 
fuller supply of fruiting specimens will be necessary to settle the question. 
A form from Allenton, Mo. (Letterman, August 27, 1878), has the cleft involucral 
bracts, fruit ribs, and larger fruit of P. capillaceum, and the stouter habit, more 
prominent stylopodium, longer styles, and range of DP. nuftallii, 
A form from near Hockley, Tex. (Thurow, September, 1890), has the cleft involu- 
