UMBELLIFER^. (l*A!{SLKV FAMILY.) 207 



21. CRYPTOTJENIA, DC IIon,:w<.ut. 



Calyx-teeth ohsolete. Fruit liiiear-ohloug, ^l:il>ruus, with »W)tuso e(inal rihs; 

 oil-tultes solitary iu the intervals and beneath each rib; styh.podiuni slender- 

 conical; seed-face plane. — A glal)rous perennial, with thin 3-foliulate leaves, 

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

 from KpvTTTos, Itldilm, and raivia, ajillct, 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 unecjually 

 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, T.mrn. Water Parsnip. 



Calyx-teeth minute. Fruit ovate to oblong, glal)rous, with prominent corkv 

 nearly equal ribs; oil-tubes 1-3 in the intervals; stylopodium depres.sed ; 

 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 cr'.oy, the Greek name of 

 some marsli plant.) 



1. S. eicutsefblium, Gmeliu. Stout, 2-6° high; leaflets 3-8 pairs^ 

 linear to lanceolate, sharply serrate and mostly acuminate, 2-5' loiu/ (lower 

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

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



2. S. Carsbnii, Durand. Weak; 1-2° high; leajiets 1 -3 pairs, linear, 

 sharply serrate, 1-2' long ; when submersed orjluatitn/, verij thin, ovate to oblong, 

 usuallij lac.iniately toothed or dissected, the leaf sometimes reduced to the ter- 

 minal leaflet; fruit about \" long. — Mass., P. I., Conn., and Penn^ 



23. BERULA, Koch. 



Calyx-teeth minute. Fruit nearly rounds .^margiuate at.^ase, glj^brous; 

 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. angUStifdlia, Koch. Erect, |- 3° high, leaflets 5-9 pairs, linear 

 to oblong or ovate, serrate to cut-toothed, often laciniately lobed, s<»metime8 

 crenate (^-3' long); fruit scarcely 1" long. (Siuiu augustifoliuni, L.) — 

 Tlu'oughout the U. S. July, Aug. 



24. ZIZIA, Koch. 



Calyx-teeth prominent. Fruit ovate to oblong, glabrous, with filiform ril>s; 

 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 iu open prairies and upland niv^adow.s. (Named for /. B. Ziz, a Rhen- 

 ish botanist.) 



