tJMBELLIFER^E. (PARSLEY FAMILY.) 207 



21. CRYPTOTJENIA, DC. HONE WORT. 



Calyx-teeth obsolete. Fruit linear-oblong, glabrous, with obtuse equal ribs ; 

 oil-tubes solitary in the intervals and beneath each rib ; stylopodium slender- 

 conical ; seed-face plane. A glabrous perennial, with thin 3-foliolate leaves, 

 no involucre, involucels of minute bractlets or none, and white flowers. (Name 

 from Kpvirrds, hidden, and rawta, aflllet, referring to the concealed oil-tubes.) 



1 . C. Canadensis, DC. Plant 1-3 high , leaflets large, ovate (2 - 4' 

 long), pointed, doubly serrate, often lobed ; umbels irregular and unequally 

 few-rayed ; pedicels very unequal ; fruit 2 - 3" long, often becoming curved. 

 N. Brunswick to Ga., west to Minn., E. Kan., and Tex. June - Sept. 



22. SIUM, Tourn. WATER PARSNIP. 



Calyx-teeth minute. Fruit ovate to oblong, glabrous, with prominent corky 

 nearly equal ribs; oil-tubes 1-3 in the intervals; stylopodium depressed; 

 seed-face plane. Smooth perennials, growing in water or wet places, with 

 pinnate leaves and serrate or pinnatifid leaflets, involucre and involucels of 

 numerous narrow bracts, and white flowers. (From <riov, the Greek name of 

 some marsh plant.) 



1. S. Cicutsefdlium, Gmelin. Stout, 2-6 high; leaflets 3-8 pairs* 

 linear to lanceolate, sharply serrate and mostly acuminate, 2-5" long (lower 

 leaves sometimes submersed and finely dissected, as in the next) ; fruit 1|" 

 long, with prominent ribs. (S. lineare, Michx.) Throughout N. America. 



2. S. Carsonii, Durand. Weak, 1-2 high; leaflets 1 -3 pairs, linear, 

 sharply serrate, 1-2' long ; when submersed or floating, very thin, ovate to oblong, 

 usually laciniately toothed or dissected, the leaf sometimes reduced to the ter- 

 minal leaflet; fruit about \" long. Mass., R. I., Conn., and Penn. 



23. BE HIT LA, Koch. 



Calyx-teeth minute. Fruit nearly round, emarginate at base, glabrous; 

 carpels nearly globose, with very slender inconspicuous ribs and thick corky 

 pericarp ; oil-tubes numerous and contiguous about the seed-cavity ; seed terete. 

 Smooth aquatic perennial, with simply pinnate leaves and variously cut 

 leaflets, usually conspicuous involucre and involucels of narrow bracts, and 

 white flowers. (The Latin name of the Water-cress, of Celtic origin.) 



1. B. angUStifblia, Koch. Erect, |- 3 high, leaflets 5-9 pairs, linear 

 to oblong or ovate, serrate to cut-toothed, often laciniately lobed, sometimes 

 crenate (|-3 X long); fruit scarcely 1" long. (Sium angustifolium, L.) 

 Throughout the U. S. July, Aug. 



24. ZIZIA, Koch. 



Calyx-teeth prominent. Fruit ovate to oblong, glabrous, with filiform ribs ; 

 oil-tubes large and solitary in the broad intervals, and a small one in each rib ; 

 stylopodium wanting; seed terete. Smooth perennials (1-3 high), with 

 mostly Thaspium-like leaves, no involucre, involucels of small bractlets, yellow 

 flowers, and the central fruit of each umbellet sessile. Flowering in early 

 spring in open prairies and upland meadows. (Named for /. B. Ziz, a Rhen- 

 ish botanist.) 



