176 



ILLINOIS STATE ACADEMY OF SCIENCE 



Trifolium hybridum 

 Trifolium stoloniferum 

 Lespediza striata 

 Melilotus officinalis 

 Euphorbia Cyparissias 

 Riciniis communis 

 Malva moschata 

 Gaura parviflora 

 Carum Carvi 

 Daucus Carota 

 Lysimachia Nummularia 

 Anagallis arvensis 

 Convolvulus arvensis 

 Ipomoea Hederacea 

 Ipomoea coccinea 

 Myosotis scorpioides 

 Verbena officinalis 

 Leonurus sibirica 

 Galeopsis Tetrahit 

 Solanum rostratum 



Physalis barbadensis 

 Datura Tatula 

 Nicotiana rustica 

 Veronica agrestis 

 Lactuca scariola 

 Tragopogon porrifolius 

 Tragopogon pratensis 

 Galinsoga parviflora 

 Anthemis arvensis 

 Chrysanthemum Parthenium 

 Cichorium Intybus 

 Sonchus arvensis 

 Centaurea Jacea 

 Artemisia annua 

 Aster angustus 

 Anthemis nobilis 

 Chrysanthemum Balsamita 

 Artemisia longifolia 

 Leontodon autumnalis 

 Hieracium aurantiacum 



A large number of species in the above list are common 

 weeds of European nativity. A few are species which 

 have come in from the West, such as Gaura parviflora, 

 Amaranthus hlitoides, Ilosakia ainericana, Solarium- 

 rostratum, and possibly Cycloloma atriplicifoUa. Two 

 species of Agropyron, A. caninum and A. biflorum, are 

 supposed to have come in from the North or Northwest. 

 They are not common. There are several species orig- 

 inally from the tropics, such as Amaranthus paniculatus. 

 Datura Tatula, Galinsoga parviflora, and Ricinus com- 

 munis. Plants evidently escaping from cultivation are, 

 Tragopogon porrifolius, Lespediza striata, Trifolium 

 hybridum, Melilotus officinalis, Cichorium Intybus, Chry- 

 santhemum Parthenium, Alyssum maritimum, Alyssum- 

 alyssoides, Lepidium sativum. Reseda alba, Hemerocal- 

 lis fidva, Muscari botryoides, Myosetis scorpioides, Ipo- 

 moea coccinea, Daucus Carota, Carum Carvi, Sedum 

 purpureum, S&mpervivum tectorum and probably a few 

 others. Isatis tinctoria, the English Woad, was found at 

 one point in Chicago. Several others mentioned above 

 are quite rare. Sisymbrium altissimum, one of the most 

 notorious of the tumble weeds, appears to have been 

 noticed first about 1890. The greatest number of species 

 for any family during this period is in the Cruciferae, 

 with 9 representatives. 



The interval from 1897 to 1921 may be taken conven- 

 iently as the last period. The number of introductions 



