HEIOSOIADITIM. CAKtJM. 153 



of former leaves. St. branched, erect, 6—8 in, higli. Dioecious. 

 — Dry limeEjtone Mis, rare. P. V. Vl. E. 



9. Heloscia'dium Koch. 



1, JI^ nodi/ldrum (Koch) ; st, proouintent at the hase and 

 rooting, 1. pinnate, leaflets ovate or ovate-ianiceplate unequally 

 bluntly serrate, wmbeh opposite to the 1, longer than their pe- 

 duncles or nearly sessile.-— -Smm Sm. — St. 1 — 2 feet long. — a ; 

 general inv. soon falling of 1 — 8 Its,, anth. purple. — /S. Jl. re- 

 pens (Koch) ; St. procumbent. Its. roundish-ovate unequally and 

 acutely incise-serrate, umbels shorter than the peduncles, 

 general inv. persistent of several Its., anthers yellow. — ■Banks of 

 ditches and brooks. P. VII, Vni. E. S. I. 



2. JI, inunddtum (Koch); st. creeping,; 1. pinnate, Its. of 

 lower I. in capillary segments, of upper I. wedgeshaped and trifid, 

 umbels generally with 2 rays, tip of pet. scarcely at all inflexed. 

 — 'Sium Sm. — Usually subniersed, a few of t^ie upper 1. and the 

 fl. rising above the water. Partial umbels very small. — Ponds. 

 P. VI. VII. E. S. I. 



10. Si'soN Zinn. Stonewort. 



1. S. Amdmum (L.). — St. erect, panicled,, 2 — 3 feet high. 

 Lower 1. pinnate; Its. oblong Jobed cut and serrate. Upper 1. 

 divided into narrow segments. , Partial umbels aind fl. smaU.- — 

 Dampish places on a calcareous soU. ' B. VIII. E. 



11. ^gopo'dium Linn. Gout-weed. 



1. ^. Foda^rdriaiJ^.).—E. B. 94Q.— St. I— 3 feet high, erect, 

 furrowed. L. 2 or 3 times temate ; leaflets ovate-aCuminate, 

 unequal at the base, acutely serrate. Crebping.-^Damp places. 

 P. VI. VII. E. S. I. 



12. Ca'etjm Linn. 



\_C. Car'ui (L.) ; partial involucre. 0, general or of .1 leaf, 

 1. bipinnate, leaflets cut into linear aegmenta. — E. B. 1503. — St. 

 1^2 feet high, branched. ' Root fusiform. Carp, arofliatic. — 

 ileadows and pastures. B, VI, Caraway.'] E, S. 



1. C. verticUldtum (Koch) ; general and partial involucres of 

 many leaves small, 1. pinnate, leaflets divided to the base into 

 capiUaiy spreading, segments. — Slum Sm. — St. 1 — IJ foo.t high. 

 Root fasciculate. Segments of the leaflets spreading so as to 

 appear whorled and quite surrounding the petiole. L. mostly 

 lonff-stalkedi radical.— Damp and hilly pastures, rare. P. VIU. 

 ^ . E. S. I. 



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