Its range overlaps with that of CE. mrmentosa, while the leaf characters 
depended upon to distinguish it ai'e not constant, but show every gradation 
to the leaf characters of that species. 
28. CYNOSCIADIUM DC. Mem. Umbel. 44, Glabrous 
annuals, with piiinately divided cauline leaves (leaflets linear), 
mostly undivided lower and radical leaves, involucre and invol- 
ucels of linear bracts, and white flowers. 
1. C. digitatum DC. 1. c. Slender, 1 to 2 feet high: radi- 
cal leaves linear-lanceolate, entire; cauline leaves palmately 3 to 
5-parted: umbels irregular, mostly 3 to 8-rayed; rays about an 
inch long; pedicels very unequal, 3 to 10 lines long: fruit a line 
long, contracted into a neck at summit, with veiy prominent ribs 
and minute calyx-teeth. (Fig. 101.) 
Wet ground, Arkansas, Alabama, Louisiana, and Texas- FI. May and 
June. 
2. C. pinnatum DC. 1. c. Smaller: cauline leaves pinnately 
divided into few distant segments, terminal one much the largest; 
radical leaves similar or often entire: umbels 5 to 10-rayed; rays % 
to 1 inch long; pedicels 1 to 4 lines long: fruit lines long, not 
beaked at summit, with less prominent ribs and very prominent 
calyx-teeth. (Fig. 102.) 
Wet ground, Arkansas, Indian Territory, and Texas. FI. April. 
Quite variable in size, often becoming very low and passing into 
Var. pumilum Engcdm. & Gray, PI. Lindh. 10, which is a 
cespitose form. 
Texas. 
29. ER\NGIUM Linn. Gen. n. 324. — Glabrous peren- 
nials, with leaves mostly rigid, coriaceous, spmosely toothed or 
divided, and white or blue flowers sessile in dense bracteate heads. 
The outer bracts form the involucre, the inner ones, bracilets^ 
intermixed with the flowers, represent the involucels. (Fig. 103.) 
* Stout^ with 'parallel-veined elongated linear coriaceous 
leaves^ which are mostly entire or with margin sparingly bristly: 
extending northward. 
1. E. yuccaefolium Michx. FI. i. 164. From 1 to 6 feet 
high, branching above: leaves broadly linear (from 2 lines to over 
an inch wide), tapering to a point, with remotely bristly margins. 
