128 THE FLORA OF THE ALPS 



13. ClCUTA, L. 



Bracts of general involucre few or o, of partial involucre 

 many, small; flowers white; calyx -teeth acute; petals 

 with an inflexed point; vittae 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. TRINIA, Hoffm. 



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

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

 incurved point ; vittae 1-2 in each furrow. Not alpine. 



T. vulgaris, 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 incurved 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. 



1 6. FALCARIA, Riv. 



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

 in hermaphrodite, o in male flowers; petals with an 



