COULTER AND ROSE—-NORTH AMERICAN UMBELLIFERAE. 73 
Missourr: Jackson County, Bush 296, June 3, 1896; Eagle Rock, Bush 9, June 
18, 1897; Clay County, Mackenzie, June 20, 1897; Atherton, Bush 121, June 
27, 1898. 
ARKANSAS: Decatur, Plank. 
{InDIAN TERRITORY: Sapulpa and Sequoyah, Bush 186, 187, June, 1894. 
OxLAnomaA: Huntsville, Kingfisher County, Laura Blankinship, May-June, 1896. 
Texas: On the San Pedro and the Pecos, Wright 1106, in 1851; near Austin, Hall 
250, May 10, 1872. 
Leptocaulis inermis Nutt. in DC. Coll. Mem, 5: 39, 1829, is certainly congenerie with 
this species and has even been considered by some to be only a smooth fruited form 
of it. An examination of Nuttall’s specimens at the Philadelphia Academy of 
Sciences would seem to indicate a different species. A smooth fruited form was also 
collected by Reverchon in Texas many years ago. Collectors in the Southwest 
should look for this plant. 
11. ERIGENIA Nutt. Gen. 1: 187. 1818. 
Calyx teeth obsolete. Fruit strongly flattened laterally, nearly 
orbicular, notched at base and apex, glabrous, thin between the 
incurved carpels. Carpels strongly flattened laterally, with equal fili- 
form ribs, very thin pericarp, and strengthening cells beneath the ribs. 
Oil tubes 1 to 3 in the intervals. 9 to 11 
onthe commissural side (from which ex- 
tends a prominent corky neck-like pro- 
jection, meeting its fellow from the 
other carpel and forming the thin area 
between the curved carpels). Seed 
face narrowly and deeply suleate. 
Low, glabrous, nearly acaulescent 
plant, from a deep-seated tuber, with 
ternately decompound leaves and oblong segments, no involucre (unless 
a reduced leaf), involucels of leafy linear or spatulate bractlets, and 
white flowers in small compact umbels. 
A-monotypic genus (based on S/son bulbosum Michx.) of the United 
States and Canada east of the Great Plains. 
a, X8; b, «10. 
When Nuttall established this genus he stated that it was probably composed of 
two species, but only one was described or named. His idea of a second species was 
given in a drawing by C. W. Short. We have carefully examined much material of 
this genus with the idea that it might be segregated, but have not been able to see 
any dividing line. The early and late forms are quite different, but there seems to 
be no warrant for Nuttall’s statement. Most of the material we have examined has 
been from the Northern States, but this has been carefully compared with specimens 
collected at Knoxville, Tenn. (the type locality of A. bulbosa). 
1. Eyigenia bulbosa (Michx.) Nutt. Gen. 1:.188. 1818. Fig. 11. 
Sison bulbosum Michx. Fl. Bor. Amer. 1: 169. 18038. 
Low, 2 dm. or less high; leaves basal except those subtending the 
imperfect umbels; pedicels very short; fruit 2mm. long, 3 mm. broad. 
Type locality, ** prope Knoxville,” Tenn. 
Inuust.: Engler & Prantl, Nat. Pflanzenfamilien 3°: 165. 1898, 
Range as given under the genus. 
