147 
ovate or broader glabrous fruit with prominent obtuse nearly equal 
ribs, depressed stylopodium (or wanting), and solitary oil-tubes. 
1. A. leptophyllum F. Muell. From 5 to 60 em. high: leaves ternately divided 
into filiform segments: umbels sessile or short-pedunculate: fruit 2mm. long. (Helos- 
ciadium leplophyllum DC.)—A species of the Gulf States and extending to Brazos 
Santiago, 
21. ZIZIA Koch. 
Smooth perennials (3 to 9 dm. high), with ternatel y divided leaves and 
broad serrate or toothed leaflets (or lower leaves sim ple), no involucre, 
involucels of small bractlets, yellow flowers, prominent calyx-teeth, 
oblong or ovate glabrous fruit with equal and prominent ribs, stylopo- 
dium wanting, and large solitary oil-tubes. 
1. Z. aurea Koch. Radical leaves very long-petioled, all but the uppermost leaves 
2 to 3-ternate; leaflets ovate to lanceolate, sharply serrate : rays 8 to 25, stout, 2.5 to 
5cm. long: fruit oblong, about 4 mm. long. ( Thaspium aureum, var. aplerum Gray. )— 
A species of the Atlantic States extending into Texas. 
2. Z. cordata Koch. Radical leaves mostly long-petioled, cordate or even rounder, 
crenately toothed, very rarely lobed or divided; stem-leaves simply ternate or 
quinate, the leaflets ovate to lanceolate, serrate, incised, or even parted: fruit ovate, 
3mm. long. (Lhaspium trifoliatum, var. aplerum Gray.)—Same range as the last. 
22. CICUTA L. (WATER-HEMLOCK.) 
Smooth poisonous marsh perennials, with pinnately compound leaves 
and serrate leaflets, few bracts or none, several slender bractlets, white 
flowers, rather prominent caly x-teeth, oblong to nearly orbicular glabrous 
fruit with strong flattish corky ribs (laterals largest), conical Stylopo- 
dium, and solitary oil-tubes, 
1. C. maculata L. (Srorrep COWBANE. MUSQUASH ROOT. BEAVER POISON. ) 
Stem stout, 6 to 18 dm. high, streaked with purple: leaves 2 to 3-pinnate, the lower 
on long petioles; leaflets lanceolate to oblong-lanceolate, 2.5 to 12.5 em, long, acumi- 
nate, coarsely serrate, the veins passing to the notches: pedicels numerous and very 
unequal: fruit broadly ovate to oval, 2 to 3 mm. long.—Throughout the United 
States, 
23. CRYPTOTZENIA DC. (Honeworr.) 
Glabrous perennials, with thin 3-foliolate leaves, no involucre, invo- 
lucels of minute bractlets or none, white flowers, calyx teeth obsolete, 
linear-oblong glabrous fruit with obtuse equal ribs, slender conical sty- 
lopodium, and solitary oil-tubes beneath each rib as well as in the 
intervals. 
1. C. Canadensis DC. From 3 to 9 dm. high: leaflets large, ovate,5 to 10 cm. 
long, pointed, doubly serrate, often lobed: umbels irregular and unequally few- 
rayed; pedicels very unequal, from 2 to 25 mm. long: fruit 4 to 6 mm, long, often 
becoming curved.—A species of the Atlantic States and extending into Texas. 
24. LEPTOCAULIS Nutt. 
Very slender smooth branching annuals, with finely dissected leaves 
having filiform or linear segments, small white flowers in involucellate 
