144 DICOTYLEDONOUS PLANTS. 



D. capillacta De Cand. : stem erect or procumbent ; umbels 3 10- 

 rayed ; leafets of the involucre 3 5, mostly 3-clefl Ammi maju* 

 Wait. Ammi capillaceum Sprang. 



HAB. Bogs. N. Y. to Geor. July Sept. 0. Stem 12 feet 

 long, geniculate, smooth. Leaves many-parted, with the seg- 

 ments all linear. Flowers white, on axillary umbels. 



Bishop Weed. 



9. CRYPTOTjENIA. DC Cand. 



Calyx with the margin obsolete. Petals obovate, sub- 

 entire, inflexed. Fruit laterally contracted, linear-oblong, 

 crowned with straight styles. Carpels with 5 equal filiform 

 obtuse ribs. Umbels numerous, arranged somewhat in the 

 form of a panicle. Rays few. General involucre none ; par- 

 tial one few leaved. Flowers white. Pentandria. Digynia. 



C. canadensis De Cand. : leaves ternate, smooth ; leafets rhomboid- 

 ovate, acute, incisely toothed, acutely serrate; umbels numerous, lower 

 ones rising from the axils of the upper leaves ; fruit oblong, rostrate 

 with the persistent styles. Sison canadense Linn. Charophyttum cana- 

 dense Pers. Pursh. Myrrhis canadensis Nutt. Torr. 



HAB. Rocky woods. Can. to Car. June. L. Stem2 3 feet 

 high, erect, smooth. Flowers white. 



10. SIUM. Linn. 



Calyx with the margin 5-toothed, often obsolete. Petals 

 obovate, emarginate, inflexed. Styles di verge nt-reflexed, ca- 

 pitulate at the apex. Fruit compressed or contracted at the 

 side, subdidymous, crowned with the styles. Carpels with 

 equal filiform and somewhat obtuse ribs. Mostly aquatics. 

 Leaves pinnate. Umbels terminal. Involucre many-leaved, 

 rarely wanting. Flowers white. Pentandria. Digynia. 



1. S. lattfolxum Linn. : root creeping ; stem erect, angular ; leavei 

 pinnate ; leafets ovate-lanceolate, unequal at base, sessile, smooth, 

 equally serrate, sometimes pinnatifid ; umbels terminal, large, many- 

 rayed ; involucres many-leaved. 



HAB. Swamps. Can. to Car. July. L. Stem 2 4 feet high. 

 Flowers white. When growing in water the lower leaves are 

 bipinnatifid, or have the leafets laciniate. Water Parsnip. 



2. & Uneart Mich. : stem erect, smooth, angular and sulcate ; lower 

 leaves pinnate, upper ones ternate ; leafets linear-lanceolate, acutely 

 and finely serrate ; umbel terminal, with short rays ; involucres many- 

 leaved, linear. & tcnu\folium Muhl. 



HAB. Swamps. N. S. July. H.Stan tall. LtaftU rerj 

 long and narrow. Flower $ white. 



