128 THE FLORA OF THE ALPS 



13. CiCUTA, L. 



Bracts of general involucre few or o, of partial involucre 

 many, small; flowers white; cal3^x- teeth acute; petals 

 with an inflexed point; vittse one in each furrow, long. 

 Not alpine. 



C. virosa, L., Water-Hemlock ; umbels opposite the 

 leaves, root-stock hollow^, chambered, leaves ter-pinnate, 

 with lanceolate doubly serrate leaflets ; ditches, occa- 

 sional ; very poisonous. 



14. Trinl\, Hoffm. 



Bracts of each involucre I, 2, or o ; flowers white ; 

 calyx-teeth small or o ; petals entire or with a short 

 incur\^ed point; vittae 1-2 in each furrows Not alpine. 



T. viilgajisy DC. ; glabrous, bracts i or o, leaves bi- 

 or ter-pinnate, with linear segments ; open hill-sides. 



15. Ptychotis, Koch. 



Involucre variable ; calyx-teeth 5 ; petals obcordate, 

 with a short incur\'ed point ; vittae one in each furrow. 

 Not alpine. 



P. heterophylla^ Koch ; flowers white, radical leaves 

 pinnate, with nearly round incised segments, stem-leaves 

 multifid, with linear segments ; dry places ; Geneva, 

 Tirol, Pyrenees. 



16. Falcaria, Riv. 

 Bracts of each involucre many, Hnear; calyx-teeth 5 

 in hermaphrodite, o in male flowers; petals with an 



