Manchester Memoirs, Vol. xlvii. (1902), No. %. 3 



years although, so far as I know, no record of its occur- 

 rence at St. Anne's has been pubh'shed. I have had it 

 under continuous observation since March last, but was 

 unable to give it a name, awaiting further developments. 

 The first indication of its inflorescence appeared when I 

 conducted the Manchester Field Club to its station at 

 St. Anne's, on the 26th July last, when one of the 

 members of the Club picked up a plant with an 

 undeveloped flowering-spike. It was then seen to be a 

 species oi Ambrosia, very like Ambrosia maritima, Linn., 

 but the foliage was scarcely hoary enough for that 

 species ; with the advance of the season and the maturity 

 of its characters I have satisfied myself that it is a dwarf 

 form of the American ragweed. Ambrosia artemisicefolia^ 

 Linn. This plant is a great nuisance to agriculturists on 

 the other side of the Atlantic, where it is regarded as a 

 pernicious weed difficult to eradicate ; the reason for this 

 will be seen from what is said further on respecting its 

 mode of growth. Besides ragweed it has received the 

 names of Roman wormwood, hogweed, stickweed, bitter- 

 weed, stammerwort, wild tansy, and carrot-weed. It is 

 found all over the North American continent from Nova 

 Scotia in the north to Florida in the south, and westward 

 to British Columbia and Mexico. It also passes over 

 into South America, and into the West Indian Islands. 



Ambrosia artemisicBfolia has already established itself 

 on the European continent ; I have examples of it in my 

 herbarium from : — 



France; Loire, Saint Galmier, September, 1883. 



Leg. Frere Anthelme. 

 „ Allier, Moulins, 31 August, 1883. 



Leg. A. Perard. 

 Switzerland ; Zurich, Oberlikon, 23 September, 1878. 



Lesf. C. Hofstetter. 



