ii6 ALIEN FLORA OF BRITAIN 



Helianthus annuus, L. A native of river banks in 



North America. Long one of the commonest of 



English garden plants, and very frequently observed as 

 an escape. 



Helianthus tuberosus, L. Native of moist alluvial 

 ground in North America. Cultivated by the aborigines, 

 and long since introduced into Europe under the name 

 of Jerusalem Artichoke, and tending to become estab- 

 lished in and near garden ground. 



[Helmlnthia echioides, Gaertn. Although generally 

 recorded as a weed of roadsides and other artificial 

 situations, it is doubtless a true native of England. Its 

 natural stations are to be looked for in dry copses and 

 such-like places. These are the situations in which it is 

 indigenous throughout the whole of Europe.] 



Heiuizonia fasciculata, Torrey and Gray. A Cali- 

 fornian weed. Occasionally recorded as a grain intro- 

 duction in England. 



Hemizonia Kelloggii, Greene. A weed of dry ground 

 in the United States. Several times noticed in con- 

 nection with other grain-sifting aliens in Britain. 



Hemizonia pungens, Torrey and Gray. Native of 

 dry hills in the United States, and a common weed 

 there also. It is on record from several localities in 

 Britain, near cornmills where American grain has been 

 used. 



Hieracium amplexicaule, L. A native of Southern 

 Europe. Long cultivated in English gardens, and now 



