134 



Journal of Agricultural Research 



Vol. V, No. 3 



their hosts. In this respect their development is similar to that of 

 plants of species of Phoradendron. 



Both C. umbellata and C. pallida very commonly are associated with 

 and parasitic upon species of Vaccinium, but are not at all dependent 

 upon this genus for host plants. This has especially been noted in the 

 case of C. pallida in the States of Colorado, Montana, Nebraska, South 

 Dakota, and Wyoming, and in C. umbellata in the States of Con- 

 necticut, Maryland, Michigan, Minnesota, New Jersey, New York, 

 Pennsylvania, Vermont, Virginia, and Wisconsin, and the District of 

 Columbia. Plants of both species are parasitic upon a great variety of 

 plants belonging to widely different sections of the Spermatophyta. 

 No attachment to plants of any member of the Pteridophyta has been 

 noted. 



C. umbellata has been found by the writer as a parasite on the roots 

 of the following species of plants in the Eastern States : 



Acer rubrum L. 



Achillea millefolium L. 



Andropogon -virginicus I/. 



Angelica villosa (Walt.) B. S. P. 



Antennaria plantaginifolia (L.) Richards. 



Aster ericoides L. 



Aster macrophyllus I/. 



Aster patens Ait. 



Aster undulatus L. 



Baptisia tinctoria (L.) Br. 



Betula nigra L. 



Betula populifolia Marsh. 



Car ex sp. 



Castanea dentata (Marsh.) Borkh. 



Chimaphila umbellata (L,.) Nutt. 



Chrysopsis mariana (L.) Nutt. 



Comptonia peregrina (L.) Coulter. 



Danthonia compressa Austin. 



Fragaria americana (Porter) Britton. 



Fragaria -virginiana Duchesne. 



Gaylussacia frondosa (L.) T. and G. 



Hieracium "venosum L. 



lonactis linariifolius (I,.) Greene. 



Lespedeza molacea (L.) Pers. 



Lysimachia quadrifolia L. 



Meibomia paniculata (L.) Kuntze. 



Panicum sp . 



Poa compressa L. 



Poa pratensis L. 



Populus tremuloides Michx. 



Potentilla monspeliensis I/. 



Quercus coccinea Muenchh. 



Quercus digitata (Marsh.) Sudw. 



Quercus marilandica Muenchh. 



Quercus nana (Wood) Britton. 



Rhus copallina L. 



Rosa blanda Ait. 



Rosa canina L. 



Rubus canadensis L. 



Rubus procumbens Muhl. 



Rubus -villosus Ait. 



Solidago bicolor L,. 



Solidago caesia L. 



Solidago juncea Ait. 



Solidago nemoralis Ait. 



Solidago speciosa Nutt. 



Spiraea salicifolia L. 



Vaccinium atrococcum (A. Gray) Heller. 



Vaccinium nigrum (Wood) Britton. 



Vaccinium vacillans Kahn. 



In addition to the foregoing and incomplete list there must be added 

 at least three unidentified species of grasses. 



During the last three years a number of attempts, with varying suc- 

 cess, have been made at Washington, D. C., to grow plants of C. um- 

 bellata and C. pallida, both by germinating the seed and by transplanting 

 rootstocks to beds and pots in greenhouses. In every case where living 

 rootstocks unattached to host plants have been transplanted to pots or 



