148 
very unequally few-rayed pedunculate umbels, calyx-teeth obsolete, 
ovate bristly or tuberculate fruit with prominent or obsolete ribs, some- 
what prominent conical stylopodium, and solitary oil-tubes. 
1. L. echinatus Nutt. From 1 to3dm. high: fruit about L mm. long, with rather 
narrow commissure, echinate with spreading hooked bristles; ribs obsolete.— 
Throughout Texas. 
2. L. divaricatus DC. From 3 to 6 dm. high, with spreading branches: umbels 
more diffuse than in the last and usually with fewer rays: fruit 1 mm. long, with 
broader commissure, tuberculate; ribs somewhat prominent.—A species of the Gulf 
States, and extending into Texas. 
25. DISCOPLEURA DC. 
Smooth branching annuals, with finely dissected leaves (filiform or 
lanceolate divisions), foliaceous bracts, prominent or minute bractlets, 
white flowers, small or obsolete calyx-teeth, ovate glabrous fruit, with 
filiform to ovate and obtuse dorsal and intermediate ribs, and very 
thick and corky laterals (forming a dilated obtuse or acute corky band 
about the fruit), conical stylopodium, and solitary oil-tubes. 
1. D. capillacea DC. From 3 to 18 dm. high: leaves tinely dissected into fili- 
form divisions: umbel 5 to 20-rayed, with involucre of filiform bracts usually cleft 
or parted, and involucels more or less prominent; rays 6 to 25 mm. long; pedicels 3 
to 6 mm. long: fruit 1 to 2 mm. long, with filiform or thick dorsal and intermediate 
ribs, the laterals forming a broad flat band about the fruit.—Wet ground throughout 
the Atlantic States and doubtless extend ing into Texas. Var. NUTTALLI Coult. & 
Rose (D. Nuttallii DC.) is usually stouter, with more numerous rays, entire involu- 
cral bracts and minute involucels, The variety belongs to the lower Mississippi 
Valley, and extends into Texas. 
9, D. laciniata Watson. From 6 to 9 dm. high : leaves dissected into lanceolate 
divisions, or the uppermost linear-setaceous : umbel nearly equally many-rayed, with 
involucre and involucels of numerous 3 to 5-parted setaceous bracts; rays 1 to 3 cm. 
long ; pedicels 4to 6mm. long: fruit about 4 mm. long, with broad and flattish dor- 
sal and intermediate ribs, the laterals forming a prominent acute ridge about the 
fruit. (Daucosma laciniatum Eng. & Gray.)—Throughout southern and western 
Texas. 
26. AMMI L. 
Probably a ballast plant, possibly an introduced weed, the follow- 
ing species being collected by Nealley near Brazos Santiago: 
1. A. majus L., with fusiform roots, pinnately divided leaves, with linear or lan- 
ceolate serrate segments, compound many-rayed umbels of white flowers, and small 
oblong fruit, with filiform ribs and solitary vil-tubes. 
27. BERULA Koch. 
Smooth aquatic perennial, with simply pinnate leaves and variously 
cut leaflets, usually conspicuous involucre and involucels of narrow 
bracts, white flowers, minute calyx-teeth, nearly round glabrous fruit 
emarginate at base, the nearly globose carpels with very slender in- 
conspicuous ribs, conical stylopodium, and numerous almost contigu- 
ous oil-tubes closely surrounding the seed-cavity. 
