70 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
vals (under the secondary ribs), 2 on the commissural side. Seed face 
deeply sulcate. 
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 com- 
missure, while the adjoining secondary ribs become marginal. Closely 
resembles Dawes. 
The first species cited by Linneus is C. grandiflora, which has 
proved to be a Daucus, the second species cited is C. daucordes, a true 
Caucalis. 
A group of 5 species, as restricted by Drude, but one of which is 
native in the Western Hemisphere. 
1. Caucalis microcarpa Hook. & Arn. Bot. Beechey, 348. 1840. 
Fie. 8. 
Erect, slender, 7.5 to 87.5 em. high, more or less hispid and some- 
times glabrate; leaves much dissected; umbels at the ends of stem and 
branches, very unequally 3 to 6-rayed, with involucre of foliaceous 
divided bracts, and involucels of entire or somewhat divided bractlets; 
rays slender, 7.5 cm. or less long; pedicels very unequal; fruit oblong, 
4 to 6 mm. long, armed with rows of hooked prickles; the primary 
lateral ribs near margin of commissural face. | 
Type locality, California; collected by Douglas. 
From Washington and Idaho to southern California and Arizona, 
and extending into Mexico. 
Specimens examined: 
Wasninaton: Klickitat County, Suksdorf 16, June 1,1881; near Pullman, Whit- 
man County, Henderson 1346, June, 1892; Wawawai, Whitman County, Piper, 
May 19, 1894; same station, /mer 98, May, 1897. 
Ipano: Nez Perces County, Sandberg 328, June 16, 1892; same station, A.A. & EF. 
Gertrude Heller 3097, May 20, 1896. 
OrEGon: John Day Valley, [/owell, May, 1885. 
CauiForNia: Bigelow, in 1858-54; Bolander 4699, in 1866; Kellogg &: Harford 1160, 
in 1868-69; near Los Angeles, //asse, April, 1888 and 1891; Oakland Hills, 
Lemmon 62, in 1889; near San Diego, Orcutt; Little Chico Canyon, Mrs. Bruce 
69, May, 1896; Santa Catalina Island, Blanche Trask, March, 1897; North 
Fork of San Gabriel River, altitude 550 meters, Letberg 3398, May 10, 1898. 
Nevapa: Mica Spring, altitude 1,200 meters, Jones 5045, April 13-14, 1894. 
Uran: Silver Reef, altitude 1,050 meters, Jones 5163, May 4, 1894. 
Arizona: Thumb Butte, Prescott, Rusby, May 28, 1883; Sierra Tucson, Pringle, 
April 15, 1884; near Tucson, Toumey 194, April 12, 1892; Pierce’s Spring, 
altitude 450 meters, Jones 5077, April 18, 1894. 
Yor introduced species see page 252. 
9. BIFORA Hofim. Umb. Gen. ed. 2. 191. 1816. . 
Calyx teeth evident. Fruit broader than long, flattened laterally, 
the globose carpels in contact only by a narrow commissure. Carpel 
