49 
Bcuthaxn & Hooker include PasHnaca under Peucedanum although tlie 
fruit characters are quite distinct and almost identical with those of ller- 
acleum. In comparison with Peucedanum, the fruit of Pantinaca is much 
more dorsally flattened, the lateral wings are nerved towards the outer 
margin, and. a remarkable layer of strengthening cells invests the seed- 
cavity (instead of occurring in small isolated groups beneath each rib); all 
of which characters it shares with Heracleurn. The length of the oil- 
tubes, a character sometimes used, is quite variable, in PasHnaca being 
sometimes as long as the fruit and sometimes shorter. 
P. sATivA L., the common parsnip, is introduced almost 
everywhere. The leaflets are ovate to oblong, and cut-toothed. 
(Fig. 29.) FI. July to September. 
18. POLYT.TINIA DC. Mem. Umbel. 58 — Perennial 
mostly glabrous herbs, with twice pinnate leaves, no involucre, iU’ 
volucels of narrow bractlets, and bright yellow flowers, 
1. P. Nuttallii DC. l.c. Two to three feet high, mostly 
glabrous except the pubescent pedicels and involucels: leaf-seg> 
merits cuneate and incised; upper leaves opposite and 8-cleft: 
umbel 6 to 12'rayed; rays about an inch long; pedicels 1 or 2 lines 
long: fruit 8 to 5 lines long. (Fig. 80.) 
Barrens, Wisconsin {Lapham), S- Michigan { Wright, Gray), and Indi- 
ana (Clapp), to Kentucky (Short), Tennessee (Oattinger), N. Alabama 
{Buckley), and Louisiana, westward to the Rocky Mountains. - 
O' 
14. COLOPTERA. — Dwarf sandy ground plants, with 
small leaves (lobed, simply pinnate, or bipinnate), no involuci'e, 
involucels of foliaceous more or less united bractlets, and mostly 
yellow flower's. 
The whole habit of this genus is very peculiar. The thick corky later al 
wings of the fruit are those of LeptoUenia, while the frequent winging of 
dorsal and intermediate ribs approaches Cymoptertis- It seems therefore 
somewhat to combine the characters of these two genera irr its fruit, while 
in habit it more nearl;/ approaches some species of Cymopterus. Such 
combination of characters is to be found in no genus, and therefore we pro- 
pose a rrew genus to contain the three following species: 
'1. C. Newberryi. Acaulescent, 2 to 6 inches high: leaves 
ovate to oblong in outline, 1 to 2 inches long, shorter than the 
petioles, pinnately 8 to 5-foliolate or simply lobed; terminal leaflet 
3-lobed, the lower mostly 2-lobed, all the lobes sparingly incised: 
umbel unec|ually 4 to 10-rayed, with conspicuous involucels of very 
