88 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
With spreading branches, 3 to 6 dm. high; umbels more diffuse than 
in S. echinatus, and usually with fewer rays; fruit tuberculate, about 
1mm. long, with rather broad commissure and somewhat prominent 
ribs. 
Type locality not given, but presumably in the Carolinas. 
North Carolina to Florida, west to Texas and Kansas. 
Specimens examined : 
Fioripa: Chapman; Hibernia, Canby, March, 1869; near Jacksonville, Curtiss, 
in 1875; Cedar Keys, Garber, April, 1876; East Florida, Mary C. Reynolds, 
April, 1876; Duval County, Fredholin, March 30, 1893; near Jacksonville, 
Curtiss 4338, 4609, April, 1893 and 1894; Eustis, Lake County, Nash 392, 
April 1-15, 1894. 
Misstssrppr: Ocean Springs, Tracy, April 10, 1890. 
Arkansas: Fort Smith, Bigelow, in 1853-54, 
Kansas: Manhattan, Riley County, Kellerman. 
INDIAN TERRITORY: Sapulpa, Bush 185, June 19, 1894. 
OxLaHomMa: Waugh 199. 
Texas: Houston, /7all 249, April 18, 1872; Dallas, Reverchon 867, 370, May, 1879 
and 1880; Tom Green County, Tweedy. May, 1880; Kerr County, eller 
1773, May 14-21, 1894; Industry, Wurzlow, in 1895. 
New Mexico: Las Vegas, Dewey, June 24, 1891. 
Spermolepis echinatus (Nutt.) Heller, Contr. Herb. Franklin & 
Marshall Coll. 1: 8. 1895. 
Leptocaulis echinatus Nutt. in DC. Prodr, 4: 107, 1830. 
Apium echinatum Watson, Bibl. Index 412. 1878. 
bo 
Lower, 1 to 8 dm. high, and not so diffuse; fruit echinate with 
spreading hooked bristles with swollen tuberculate bases, about 1 mm. 
long, with rather narrow commissure and obsolete ribs. 
Type locality, ** Red River” [Arkansas]; collected by Nuttall; type 
(or duplicate) in Herb. Philad. Acad. 
From Alabama to southern California, and extending into Mexico. 
Specimens examined : 
Mississrpri: Petit Bois Island, Tracy 4926, May 8, 1898. 
Inpran Terrirory: Palmer 148a, in 1868; Sapulpa, Bush 188, June 19, 1894, 
Texas: Western Texas, Wright 1584, in 1852; Austin, //adl 251, May 17, 1872; 
Dallas, Reverchon 368, April, 1879 and 1881; Gillespie County, Jermy 142; 
Nueces County, [eller 1520, 1561, April 8-12, 1894. 
New Mexico: Carrizallilo Mountains, Mearns 37, April 20, 1892. 
Arizona: Tucson, Towmey 195, March 26, 1892. 
Caurrornra: Oakland Hills, Lemmon, in 1889, 
For Leptocaul/s inermis Nutt. see under Apiastrum. 
22. AMMOSELINUM Torr. & Gray Pacif. R. Rep. 2: 165. 1855. 
Calyx teeth obsolete. Fruit flattened laterally, ovate to ovate-oblong. 
Carpel with prominent equal more or less scabrous ribs; laterals closely 
contiguous to those of the other carpel, forming apparently a single 
broad rib; pericarp exceedingly hard, composed almost entirely of 
