UMBELLIFER^ 127 



Tribe Ammine^. — Resembling the last, but the seeds 

 flattened ventrally. Genera 10-20. 



10. SiUM, L. 



Leaves pinnate, with toothed leaflets ; bracts of general 

 and partial involucre many ; flowers white ; calyx-teeth 

 acute ; petals with an inflexed point ; vittae many in each 

 furrow. Glabrous marsh plants ; not alpine. 



5. latifolium, L. ; umbels terminal, lower leaves very 

 large ; and angustifoliuin, L. {Berula angustifolia^ Koch) ; 

 umbels opposite the leaves, leaves not so large; wet 

 places, the latter very common. 



II. Helosciadium, Koch. 



Bracts of general involucre few or o, of partial involucre 

 many ; flowers white ; calyx-teeth o ; petals without an 

 inflexed point ; vittae solitary in the furrows. Glabrous 

 marsh plants ; not alpine. 



H. repensy Koch ; stem prostrate, umbels stalked, leaf- 

 segments oval ; and nodijioriini, Koch ; umbels nearly 

 sessile, leaf-segments oval-lanceolate; wet places and 

 ditches, both rather local. 



12. SiSON, L. 



Bracts of general and partial involucre few ; flowers 

 small, white ;' calyx-teeth o ; petals with an inflexed point ; 

 vittae one in each furrow, very obscure. Not alpine. 



6'. Aiiiomum, L. ; foetid, stem 2-3 ft., very slender, 

 solid, flowers very small and few, stem-leaves very small, 

 3-lobed or entire ; road-sides, rare ; Geneva, Carniola. 



