146 
1. A. patens Coult. & Rose, From 3 to 6 dm. high, branching above: leaves 2.5 
to 5 em. long, ternately or biternately divided, with long filiform segments: umbels 
long-peduncled ; rays from 2.5 cm. long to wanting; pedicels 1 em. long to wanting: 
fruit ovate, 1 mm. long. (Leptocaulis patens Nutt.)—Throughout Texas. 
17. CHA}ROPHYLLUM L. 
Moist ground annuals, with ternately decompound leaves, pinnatifid 
leaflets with oblong obtuse lobes, usually no involucre, involucels of 
many bractlets, white flowers, obsolete calyx-teeth, narrowly-oblong to 
linear fruit notched at base and with equal ribs, conical stylopodium, and 
mostly solitary oil-tubes. 
1, C. procumbens Crantz. More or less hairy : stems slender, spreading, 1 to 6dm, 
high : umbel sessile or peduncled, few-rayed ; rays 2.5 cm. to 5 cm. long; pedicels from 
8mm. long to almost wanting: fruit narrowly oblong, 5 to 8 mm. long, glabrous, con- 
tracted but not tapering at summit, the intervals broader than the ribs. —An exceed- 
ingly polymorphous species of the Eastern States, the typical form probably not 
reaching Texas, but represented throughout eastern and central Texas by two varie- 
ties: Var. TAINTURIERI Coult. & Rose, with fruit tapering at summit or beaked, and 
very prominent ribs much broader than the intervals; Var. DASYCARPUM Coult. & 
Rose, differing from the other variety in having pubescent fruit, with ribs prominent 
but narrower than the intervals. 
18. MUSENIOPSIS Coult. & Rose. 
Glabrous acaulescent perennials from thick elongated roots, with pin- 
nate leaves, no involucre, involucels of few small bractlets, yellow 
flowers, obsolete calyx-teeth, oblong glabrous fruit with equal filiform 
ribs (the intermediates somewhat distant from the laterals), depressed 
stylopodium, and 3 or 4 oil tubes in the intervals. 
1. M. Texana Coult. & Rose. Scape to 20 cm. high, longer than the leaves, some- 
what scabrous at base of umbels: leaves 5 to 7-pinnate ; lower pinnex petiolulate, 
pinnately parted ; segments cuneiform, 3 to 5-cleft: umbel 5 to 8-rayed: fruit 3 mm. 
long. (Tauschia Texana Gray.)—Western Texas, and extending into Mexico. 
19. SIUM L. (WATER PARSNIP.) 
Smooth perennials growing in water or wet places, with pinnate leaves 
and serrate or pinnatifid leaflets, involucre and involucels of numerous 
narrow bracts, white flowers, minute calyx-teeth, ovate to oblong gla- 
brous fruit with prominent corky nearly equal ribs, depressed stylopo- 
dium, and 1 to 3 oil-tubes in the intervals. 
1. S. cicutzefolium Gmelin. Stout, 6 to 18 dm. high: leaflets 3 to 8 pairs, linear 
to lanceolate, sharply serrate and mostly acuminate, 5 to 12.5 cm. long (lower leaves 
sometimes submersed and finely dissected): umbel many-rayed ; rays 2.5 to 3.5 em. 
long; pedicels 2 to 6 mm. long: fruit 3 mm. long, with prominent ribs. (8S. lineare 
Mx.)—Apparently throughout North America. 
20. APIUM L. 
Erect or prostrate glabrous herbs, with pinnately or ternately divided 
leaves, umbels of white flowers opposite the leaves, obsolete calyx-teeth, 
