\ 



202 MISSOURI BOTANICAL GARDEN. 



ftcinale, Polanida gravedlens, Lychnis Githago, Silene media, 

 Ahidilon Avicennae, Tribulus grandifiorus, Dalea alopecu- 

 roides, Glycyrrhiza lepidota, Indigofera leptosepala, Melilotus 

 alba, Melilotus officinalis, Daucus Carota, Dipsacus sylvcstris, 

 Chrysanthemum Lcucanthemum, Lactuca Scariola, L. Scariola 

 integrata, Matricaria discoidea, Verhesina encelioides, Linaria 

 vulgaris, Solanum rostratum, Ballota nigra, Lamium amplexi- 

 caule, Leonurus Cardiaca, Alopecurus geniculatus, Bromus 

 secdinus, Dactylis glomerata, Eleusine indlca, Ilordeum 

 juhatum, Panicum sanguinale, Poa annua, Poa comprcssa, 

 Poa pratensis, Setaria glauca, Sctaria italica, Setaria viridis 

 and Sorghum halepense. It is probable that seed of each of 

 these species was introduced repeatedly, of some njore re- 

 cently, of others earlier. Among the latter must be classed 

 Lactuca Scariola integrata, sometimes designated by Ameri- 

 can authors as L. Scariola and again as L. virosa* This en- 

 tire leaved form, which is entirely distinct from the European 

 L. mrosa, was introduced into Missouri from IlHnois. Accord- 

 ing to Mr. J. H. Kellogg, it was plentiful in the American Bot- 

 tom thirty years ago. Some ten years later its occurrence 

 on this side of the IMississippi was noted. Since then it has 

 spread to an enormous extent, being one of the principal 

 weeds of roadsides and emi)ty lots. During the summer of 

 1907 Dr. Trelease noted the appearance, west of St. Louis, 

 of the cut-leaved form, the true L. Scariola. During the same 



vicm 



but 



not in the city itself. This year, 1908, there 

 has been a marked increase in the number of individuals of 

 Lactuca Scariola as well as in the number of localities where 

 the plant was encountered. It has also made its appearance 

 on lots well within the city limits. 



The plants which have escaped from cultivation and have 

 become established are Delphinium Ajacis, Brassica alba, 

 B. nigra, Nasturtium Armoracia, N. officinale, Raphanus 

 sativus, Saponaria officinalis, Linum usitatissimum, Ailan- 

 thus glandidosus, Medicago saliva, Robinia Pseudacacia, 

 Tri folium hybndum, T. pratcnse, T. repcns, Vicia sativa, 

 Primus Persica, Coriandnim sativum, Foeniculum officinale, 



* Dewey, L. H. Identity of Prickly Tjettuce. Rhodora. 7 : 9. 1905. 



