13 



Solidago juncea 



" nemoralis 



" bicolor 



" puherula 



" rugosa 



" caesia 

 lonactis linariifoHus 

 Centaurca Jacea 

 Tri folium repens 

 " pra tense 

 " agrarium 

 " arvense 

 Rudbeckia hirta 

 Viola pedata 

 Verbascum Thapsus 

 Persicaria pennsylvanica 



Garden City. 



Oenothera luuricata 

 Melilotus alba 

 Nabalus sp. 

 Rubus sp. 

 Erigcron ramosus 



" canadensis 

 Gnaphalium obtusifolium 

 Plantago lanceolata 



" aristata 

 Chrysanthemum Leucanthemum 

 Brassica sp. 

 Lepidium 



Hieracium scabrum 

 Polygonella articulata 

 Dianthus Armeria 

 Eriocaulon septangulare 



William C. Ferguson 



Concerning Duplicate Types. — In the extensive array of 

 names compounded with "type," all of which agree in present- 

 ing some idea derived from or modifying the meaning of that 

 word, it seems strange that the conception which we taxonomists 

 most often have occasion to designate appears not to have re- 

 ceived any mononomial term. I allude to that which some of us 

 have erred in calling "co-type," and to which others, more con- 

 sistent, have applied the phrase "duplicate type" or "duplicate 

 of type." 



In 1905, Dr. A. S. Hitchcock indicated the distinction between 

 duplicate type and co-type. In Science 21: 832, he defines a 

 duplicate type as a specimen "of the same series or set as the 

 type as indicated by the number or other data," and a co-type 

 as a specimen "cited with the original description in addition 

 to the type specimen." In actual practice, in explaining our 

 application of names, we continually need a short expression for 

 the former — something as simple and easily remembered as the 

 really less important word co-type. To meet this need I sug- 

 gest the term isotype. 



