MIDDLESEX FLORA. 41 



-^THUSA, L. 



^. Cynapium, L. Fool's Parsley. 

 Roadsides, Medford to Watertown (Wm. Boott). Nat. from Eu. 

 This plant lias poisonous qualities, and serious results have some- 

 times ensued from confounding it with common Parsley, which it 

 somewhat resembles, but from which it may easily be distinguished, 

 when in flower, by its lack of a general involucie, and its long, hang- 

 ing involucels. July. 



LlGUSTICUM, L. 



*L. Scoticum, L. Scotch Lovage. 

 Cambridge (Bigelow's Fl. Bost.) ; Watertown (C. E. Perkins). 

 Pare. Aug. 



TlIASPIUM, Nutt. 



T. aureum, Nutt. Meadow Parsnip. 

 Common in the northern and western parts of the county. May- 

 June. 



ZiziA, Koch. (Not ZiziA of Man.) 



Z. aurea, Koch. (Thaspium aureum, Nutt., var. apterum Man.) 

 Dunstable (Dr. C W. Swan). 



BuPLEURUM, Tourn. 



B. rotundifoUum, L. 



Cambridge, one plant in gravel sidewalk (Walter Deane ; specimen 

 in herb. of). Adv. from Eu. 



CiCUTA, L. 



C. maculata, L. Spotted Cowbane. Water Hemlock. 

 Connnon. July-Aug. 



C. bulbifera, L. 



Common. Aug.-Sept. 



SiUM, L. 



S. cicutaefolium, Gmel. (S. lineare, Michx., Man.) Water 



Parsnip. 



Common. July-Aug. 

 S. Carson i, Durand. 



Tewksbury (Dr. C. W. Swan) ; Ashland (Rev. Thos. Morong). 



Very rare. 



Cryptot^nia, DC. 



C. Canadensis, DC. Honeavort. 

 Belmont, abundant in 1882 (Walter Deane: specimen in herb. of). 

 June-July. 



