Ranging across the continent from the S. Atlantic states to S. Cali- 
fornia, and along the Pacific coast to Vancouver Island {Macoun) and 
Nootka Sound {Scouler). 
The varieties microphyllus and scaher depend entirely upon the vary- 
ing character of the hairs, a character not to be relied upon. This species 
is evidently the American representative of the widely distributed 
D. Car Ota L. 
D. Carota L., the cultivated carrot, has become extensively 
naturalized. The stems are bristly, leaves more coarsely divided 
(the ultimate segments lanceolate and cuspidate), umbels with 
more numerous and elongated rays and more prominent in- 
volucres, and fruit generally larger. 
2. CAUCALIS Linn. Gen. n. 331. — Mostly hispid annuals, 
(ours) with pinnately dissected leaves (with very small segments), 
and white flowers. The primary lateral ribs are pushed around 
upon the commissural face, making a very narrow commissure, 
while the adjoining secondary ribs become marginal. Closely 
resembles Daucus. 
1. C. microcarpa Hook. & i\rn. Bot. Beechey, 348. Erect, 
slender, 3 to 15 inches high, nearly glabrous: leaves much dis- 
sected, slightly hispid: umbels at the ends of stem and branches, 
very unequally 3 to b-rayed, with involucre of foliaceous divided 
bracts, and involucels of entire or somewhdt divided bractlets; rays 
slender, 3 inches or less long; pedicels very unequal: fruit oblong, 
2 to 3 lines long, armed with rows of hooked prickles; the primary 
lateral ribs near the margin of commissural face. (Fig. 2.) 
Washington Territory (Suksdorf), Oregon {Henderson), California, 
and Arizona (Palmer, Pringle). FI. Aprii and May. 
C. NODOSA Hudson. Decumbent, branching only at base, 
stems 1 or 2 feet long, retrorsely hispid: umbels naked, opposite 
the leaves and nearly sessile, of 2 or 3 very short rays: fruit ovate- 
oblong, a line long, entirely covered with rough tubercles or 
usually with stout barbed or hooked prickles; the primary lateral 
ribs near the very narrow commissure. (Fig. 3.) 
Native of Europe and'-N. Africa, introduced into Chili and Peru, and 
thence into California; Texas (Hall); ballast ground. Port Eads, Louisiana 
(Langlois); near Baltimore (Foreman); ballast ground near Philadelphia 
(Martindale); near Ames, Iowa (Burgess). 
C. Anthriscus Hudson, with 1-2-pinnate leaves and broad 
