34 
leaflets, and more regularly compounded umbels, seems to be 
naturalized near Buffalo, N. Y. ( G. W. Clinton)^ Cincinnati, Ohio 
( C. G.Lloyd^ Bot. Gazette, iv. 148), and Painesville, Ohio ( W. 
C. Werner). 
C. i.ATiFOLiA L., with pinnate leaves having few subpinnatifid 
leaflets, and large spiny fruit, has been found on ballast ground 
near Philadelphia (/. C. Martindale). 
3. TREPOCARPUS Nutt, in DC. Mem. Umbel. 56.— 
Glabrous annuals, with thin pinnately decompound leaves and 
linear segments, lateral few-rayed umbels opposite the leaves, in- 
volucre and involucels of few linear entire or divided bracts, and 
white flowers. / 
1. T. iEthusae Nutt, 1. c. From a few inches to 3 feet 
high: umbels 2 to 5-rayed; umbellets few-flowered, with very 
short pedicels: fruit 4 or 5 lines long. (Fig. 4.) 
Prairies, from Arkansas to Louisiana, Texas, and Indian Territory, 
FI. June and July. • 
4. BIFORA Hoffm. Umb. Gen. 191. — Slender smooth an- 
nals, with leaves pinnately dissected into filiform segments, in- 
volucre and involucels of few small bracts, and white flowers in 
few-rayed umbels. 
1. B. Americana Benth. & Hook. Gen. PI. i. 926. A foot 
or more high, branching above, rays and angles of stems (espec- 
ially summit of internodes) roughened with minute callous points: 
umbels 5 to 8-rayed; rays 6 to 9 lines long; pedicels about a line 
long: fruit 1^ lines long, 2^4 lines broad. (Fig. 5 .) — Atrenia 
Americana DC. 
Dry ground, mostly in Texas, and extending into Arkansas. The 
reference of this species to Missouri (Tracy), in Bot. Gazette, xii. 295, was 
a mistake. 
B. RADIANS Bieb, from the Mediterranean region, has been 
collected on ballast near Philadelphia, Penn. {Martindale) and 
Providence, R. I. {Bennett) 
5. CORIANDRUM Linn. Gen. n. 356.-— Annual slender 
branching glabrous herbs, with pinnately compound leaves, no 
