June, 1902.] 
Rosette Plants of Ohio. 
2 93 
the bottom of which is the terminal bud. This can be well seen 
in case of the Dandelion in Autumn. Probably this serves to 
protect the plant from cold as well. 
In making up a list, such as follows, one soon finds that a line 
must be drawn where none exists and that plants must be excluded 
that are very little different from some that are included. In an}' 
such group a series of gradations may be found that lead to one 
or more other groups. In these lists only those plants have been 
included in whose life history the rosette plays quite an important 
part. 
LIST OF BIENNIAL ROSETTE PLANTS. 
Alliaria alliaria 
Arabis canadensis 
Arabis braehycarpa 
Arabis glabra 
Arabis lyrata 
Arabis laevigata 
Arabis hirsuta 
Arabis patens 
Arabis virginica 
Arctium lappa 
Arctium majus 
Arctium minus 
Barbarea barbarea 
Bursa bursa-pastoris 
Cardamine hirsuta 
Carduus altissimus 
Carduus discolor 
Carduus lanceolatus 
Carduus muticus 
Carduus odoratus 
Carduus virginianus 
Caruin carui 
Cicliorium intybus 
Cynoglossum officinale 
Daucus carota 
Digitalis lutea 
Digitalis purpurea 
Dipsacus sylvestris 
Erysimum cheiranthoides 
Erysimum asperum 
Frasera carolinensis 
Gaura biennis 
Gaura parviflora 
Gnaphalium decurrens 
Gnaphalium purpureum 
Lactuca canadensis 
Lactuca floridana 
Lactuca hirsuta 
Lactuca sagittaefolia 
Lactuca saligna 
Lactuca scariola 
Lactuca spicata 
Lactuca spicata integrifolia 
Lactuca virosa 
Lappula virginiana 
Lepidium apetalum 
Lepidimn campestre 
Lepidium virginicum 
Linaria canadensis 
Lithospermum arvense 
Lobelia leptostachys 
Lobelia spicata 
Lychnis coronaria 
Mariana mariana 
Oenothera lacinata 
Oenothera rliombipetata 
Onagra biennis 
Onagra biennis grandiflora 
Onagra oakesiana 
Onopordon acanthium 
Pastinaca sativa 
Potenti'la argentea 
Potentilla canadensis 
Potentilla monspeliensis 
Potentilla paradoxa 
Potentilla pumila 
Ranunculus abortivus 
Ranunculus micranthus 
Ranunculus sceleratus 
Raphanus raphanistruin 
Raphanus sativus 
Roripa palustris 
Rudbeckia hirta 
Salvia lyrata 
Sisymbrium altissiinum 
Sisymbrium officinale 
Sophia pinnata 
Tragopogon porrifolius 
Tragopogon pratensis 
Verbascum blattaria 
Yerbascum thapsus. 
