74 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Specimens examined: 
PENNSYLVANIA: York County, Garber, May 4, 1868. 
Mary.uanpb: Plummer Island, Rose 1145, April 23, 1897. 
District or CoLumBra: Little Falls, Vasey, in 1873 and 1879; High Island, Ward, 
in 1879; Great Falls, Vasey, in 1881; High Island, Pollard 25, April 6, 1895. 
TENNESSEE: Knoxville, Ruth 423, April, 1898; same station, Kearney. 
Kentucky: Near Frankfort, Williamson, April, 1878. 
Onto: Lancaster, Bigelow; near Niles, Ingraham, May, 1891; Lorain County, 
Ricksecker, March, 1894; Collamer, Stair, April 20, 1895. 
InpIANA: Near Mattsville, Wilson 9, April 22, 1892. 
MicaiGANn: Bellevue, Shoop; near Alma, Davis, April 29, 1891. 
Iuuinots: Naperville, Umbach, April-May, 1898. 
Kansas: Baxter Springs, Plank. 
12. OROGENIA Watson, Bot. King Surv. 120. 1871. 
Calyx teeth minute. Fruit oblong, very slightly flattened laterally, 
glabrous. Carpel much flattened dorsally, with filiform dorsal and 
intermediate ribs; laterals excessively 
corky thickened, involute (that is, 
extended toward the other carpel, 
leaving between the commissural faces 
a cavity, which is divided longitudi- 
nally by a thick corky projection from 
the middle of each face); all with dis- 
tinct groups of strengthening: cells. 
Z Stylopodium depressed. Oil tubes 
very small, 3 in the intervals, 2 to 4 
on the commissural side. Seed face 
slightly concave. 
Dwarf glabrous nearly acaulescent plants, from tuberous or fusi- 
form roots (underground part of the stem sheathed with large scarious 
bracts), with ternate leaves and linear segments, no involucre, involu- 
cels of few linear bractlets, and white flowers in subcompound. umbels 
with very unequal rays. 
Type species, O. linearifolia Watson. 
A group of two species, restricted to the United States west of the 
Rocky Mountains. 
if rr. 
4. 12.--Orogenia linearifolia: 
a,b, & 8. 
Stems from deep-seated round tubers ............-----+--------- 1. O. linearifolia. 
Stems from long fusiform roots 2. OJ fusiformis. 
1. Orogenia linearifolia Watson, Bot. King Surv. 120. pl. 14, figs. 1-3. 
1871. Fie. 12. 
Stem (or scape) slender, rising 2 to 12 cm. above ground from a 
deep-seated round tuber; leaves 2 or 3, once or twice ternate, upon 
slender petioles; leaflets entire, 2.5 to 5 em. long, 2 to 6 mm. wide, 
obtuse; umbels 2 to 10-rayed, with nearly sessile flowers; fruit 3 to 4 
mm. long, lateral ribs and commissural projection much more strongly 
developed than in O. fusiformis. 
