140 
* * * Qjil-tubes more than one in the intervals. 
+ Stylopodium conical. 
97. Berula. Fruit round, with globose carpels and very slender inconspicuous ribs. 
+ + Stylopodium depressed. 
18. Museniopsis. Acaulescent: fruit with filiform ribs and plainly concave seed- 
face: flowers yellow. 
19. Sium. Stout and canlescent: fruit with prominent equal corky ribs and plane 
or but slightly concave seed-face: flowers white. 
C. Fruit strongly flattened laterally. 
29, Hydrocotyle. Mursh or aquatic plants with simple leaves. 
1. DAUCUS Tourn. (CARROT.) 
Bristly annuals or biennials, with pinnateiy decompound leaves, folia- 
ceous and cleft bracts, entire or toothed bractlets, white flowers in con- 
cave umbels, obsolete calyx-teeth, oblong dorsally flattened fruit with 
bristly primary ribs and winged secondary ones each bearing a single 
row of prominent barbed prickles, depressed stylopodium (or none), 
and solitary oil-tubes. 
1. D. pusillus Mx. Stems retrorsely-hispid, from 2.5 to 60cm. high: leaves finely 
dissected into narrowly linear segments: umbels nnequally few to many-rayed; rays 
1 to 3.5 em. long; pedicels very unequal, from 16 mm. to almost wanting: fruit 3 to 
5 mm, long.—Throughout Texas. Very variable in its pubescence characters. 
2. D. Carota L., the common cultivated carrot, has become extensively natural- 
ized. The stems are bristly, leaves more coarsely divided (the ultimate segments 
lanceolate and cuspidate), umbels with more numerous and elongated rays and 
more prominent involucres, and fruit generally larger. 
2. CUMINUM L. (CuMIN). 
The common “cumin” of the Mediterranean region has been found 
growing spontaneously near El Paso. 
1. C. Cyminum L. is a small slender annual, 7.5 to 25 em. high, with long filiform 
leaflets and similar bracts and bractlets, awl-shaped sepals, rose-colored petals, fruit 
with long hairs and bristles, and oil-tubes solitary under the secoudary ribs. 
3. TREPOCARPUS Nutt. 
Glabrous annuals, with thin pinnately decompound leaves and linear 
segments, lateral few rayed umbels opposite the leaves, involucre and 
involucels of few linear entire or divided bracts, white flowers, prom- 
inent unequal ecalyx-teeth, linear-oblong laterally flattened smooth 
crustaceous fruit, no primary ribs, 4 prominent corky secondary ribs, 
conical stylopodium, and solitary oil-tubes veneath the secondary ribs. 
1. T. Althuse Nutt. From 1 to 9 dm. high: umbels 2 to 5-rayed; umbellets 
few-flowered, witb very short pedicels: fruit 8 to 10 mm. long.—Prairiesof northern 
and eastern Texas. 
4. BIFORA Hoffm. 
Slender smooth annuals, with leaves pinnately dissected into filiform 
segments, involucre and involucels of few small bracts, white flowers in 
