141 
few-rayed umbels, evident calyx-teeth, laterally flattened smooth fruit 
with globose carpels in contact only by a narrow commissure, no pri- 
mary ribs, 4 filiform secondary ribs, a thin very hard pericarp, conical 
stylopodium, no oil tubes, and a deeply concave seed-face. 
1. B. Americana Gray. Branching above, 3 dm. or more high, rays and angles 
of stem (especially summit of internodes) roughened with minute callous points: 
umbels 5 to 8-rayed; rays 12 to 18 mm. long; pedicels about 2 mm. long: fruit 3 
min. long and 5 mm. broad.—Dry ground, throughout Texas east of the Pecos. 
5. BURYTENIA Torr. & Gray. 
Glabrous branching herbs, with pinnately dissected leaves, involucre 
and involucels of cleft bracts, white flowers, prominent calyx-teeth, 
ovate glabrous dorsally flattened fruit, filiform dorsal and intermediate 
ribs, very prominent thick- winged lateral ribs, depressed stylopodium, 
and solitary very broad oil tubes. 
1. E. Texana Torr. & Gray. From 3 to8 dm, high: leaflets long, narrowly linear 
to oblong, serrate or toothed: umbels 8 to 15-rayed; rays 2.5 to 5 cm. long; pedicels 
very short: fruit 4 mm. long.—Kastern Texas. 
6. HERACLEUM L. (Cow-parsnip.) 
Tall stout perennials, with large ternately compound leaves, decidu- 
ous involucres, involucels of numerous bractlets, large many-rayed 
umbel of white flowers, small or obsolete calyx-teeth, obcordate petals 
(the outer ones often dilated and 2-cleft), broadly obovate very much 
dorsally flattened somewhat pubescent fruit, dorsal and intermediate 
ribs filiform, the laterals broadly winged, thick-conical stylopodium, 
and solitary oil-tubes (about half as long as the car pel). 
1. H. lanatum Mx. Very stout, 12 to 24dm. high, pubescent or woolly above: petioles 
much dilated ; leaflets petiolulate, round-cordate, 10 to 25 em. broad, irregularly cut- 
toothed: rays 5 to 15 em. long: fruit 8 to 12 mm. long, somewhat pubescent,—Un- 
doubtedly occurring in Texas in wet ground. 
7. PASTINACA L. (PARSNIP). 
Tall stout biennial, with pinnately compound leaves, mostly no invo- 
lucre, yellow flowers, obsolete calyx-teeth, oval very much dorsally flat- 
tened glabrous fruit, filiform dorsal and intermediate ribs, broad lateral 
wings, depressed but prominent stylopodium, and small solitary oil- 
tubes, 
1. P. sativa L., the common parsnip, with ovate to oblong cut-toothed leaflets, is 
naturalized almost every where. 
8. POLYTANIA DC. 
Perennial mostly glabrous herbs, with twice pinnate leaves, no in- 
volucre, involucels of narrow bractlets, bright yellow flowers, conspic- 
uous calyx-teeth, obovate to oval much dorsally flattened glabrous 
fruit, dorsal aud intermediate ribs small or obscure in the depressed 
