UMBELLIFER.E. (PARSLEY FAMILY.) 179 



11. CRYPTOT^NIA, DC. 



Calyx teeth obsolete. Fruit obloug, contracted at the sides. Carpels 

 equally 5-ribbed, with very slender single vittte in each interval, and one 

 under each rib. — A smootli perennial herb, with trifoliolate leaves on long 

 petioles. Leaflets large, ovate, doubly serrate and mostly lobed. Rays of 

 the umbel few and very unequal. Involucre none. Involacels filiform. 

 Flowers white. 



1. C. Canadensis, DC. — Eich shady soil, chiefly in the upper districts 

 July. — Stem 2° high. 



12. SIUM, L. 



Calyx teeth small or obsolete. Fruit ovate or globular, flattened at the 

 sides ; the carpels with 5 equal corky ribs. Intervals usually with several 

 vittffi. — Marsh or aquatic perennial lierbs. Leaves pinnate; the immersed 

 ones dissected into numerous capillary divisions. Involucre several-leaved. 

 Flowers white. 



1. S. lineare, Michx. Leaflets varying from linear to oblong, finely and 

 sharply serrate ; calyx teeth minute , fruit globular, strongly ribbed. — Along 

 streams, commonly in water. West Florida and North Carolina. Rare. 

 July. — Stem 2° high. 



13. THASPIUM, Nutt. 



Calyx 5-toothed. Fruit ovoid or oblong, nearly terete, the carpels .5-winged. 

 Vittffi single in the intervals and two on the commissure. — Perennial herbs, 

 with 1 - 3-ternately divided leaves, or the lower ones entire, and yellow 

 (rarely purple) flowers. Involucre none. Fruit all pedicellate. 



1. T. aureum, Nutt. Glabrous; stem sparingly branched, 1°- 3° high ; 

 radical leaves simple, cordate ; stem leaves ternate, the leaflets oblong-lanceo- 

 late, sharply serrate ; flowers yellow or (in var. atropurpureum, C ^ R.) dark 

 purple; fruit ovoid, 2" long, the ribs winged. — Dry open woods. May- 

 July. 



2. T. barbinode, Nutt. Stem 2° -3° high, widely branching, pubescent 

 at the joints; leaves mostly 2- 3-ternate, the leaflets thin, ovate or ovate- 

 lanceolate, coarsely seri-ate and often lobed ; flowers yellow ; fruit elliptical, 

 3" long, with three of the ribs more narrowly winged. — Woods and rocky 

 hanks, chiefly in the up])er districts. May to July. 



Var. pinnatifidum, C. & R. More or less pubescent ; leaflets small 

 (i' long), coarsely toothed; fruit smaller, puberulent. — Rocky banks of the 

 Chipola River, West Florida. June. 



3. T. pinnatifidum, Gray. Branches and umbels roughish-puberulent ; 

 leaves 1 - 3-ternate ; leaflets 1 - 2-pinnatifid, the lobes linear or oblong ; fruit 

 oblong, narrowly 10-winged, 2" long, the intervals minutely scabrous. — 

 Mountains of North Carolina and Tennessee. — Stem 2° -3° high. 



14. ZIZIA, Koch. 

 Habit and most of the characters of Thaspium, but the fruit laterally com- 

 pressed, wingless, and the central one of each umbellet sessile. Flowers 

 yellow. 



