90 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
3. Ammoselinum butleri (Engelm.) C. & R. Bot. Gaz. 12: 294. 1887. 
Apium butleri Fngelm. Proc. Am. Acad. 21: 453. 1886. 
Resembling A. popez, but smaller and nearly glabrous; leaf-seg- 
ments narrowly oblong or spatulate; fruit ovate, about 2 mm. long, 
with ribs smooth or minutely scabrous, and corky commissure much 
less prominent. 
Type locality, ‘*' Texas, in wet grounds near Houston”; collected by 
Flall, no, 244, March, 1872; type (or duplicate) in Herb. Gray. The 
type here given is the first specimen cited. Associated with it in the 
original description are /?everchon, near Dallas, Tex., and Butler in 
Indian Territory, south of the Arkansas. 
In wet ground, Texas and adjacent Indian Territory. 
Specimens examined: 
Texas: Near Houston, //all 244, Mareh 20, 1872; near Harrisburg, Joor 122, 
March 16, 1876; near Dallas, Reverchon 366, March, 1878 and 1880; Nealley, 
in 1888; Hockley, Harris County, Throw, March 28, 1889; near Galveston, 
Bodin, March 3, 1890; near Industry, Wurzlow, May, 1895; near Houston, 
Rose 4179, May 6, 1899. 
23. ZIZIA Koch, Nov. Act. Caes. Leop. Acad. 12: 128. 1824. 
Calyx teeth prominent. Fruit flattened laterally, ovate to oblong, 
glabrous. Carpel with 
filiform ribs. Stylopo- 
dium wanting; styles 
long. Oil tubes large 
and solitary in the 
broad intervals, 2 on 
the commissural — side, 
and a small one in each 
rib. Seed terete, sul- 
cate beneath the oil 
tubes. 
Smooth perennials (3 
to 9 dm. high) of open 
prairies and upland 
meadows, with simple 
to ternately compound 
leaves, no involucre, 
involucels of — small 
bractlets, yellow flowers, and central fruit of each umbellet. sessile. 
Type species, Smyrnium aurewn L. 
A group of 3 species, belonging to the United States and Canada. 
Fig, 22.—Zizia cordata: a,b, « 10. 
Basal leaves ternately divided. 
Stout plants with leaflets sharply serrate......2..0-0-2 2.22222. 1. Z. aurea 
Slender plants with leaflets coarsely serrate or toothed.........2......2. Z. bebbii 
Basal leaves simple ......22-..-2..-.---------.-+-----2----------- eee 3. Z. cordata 
