14 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



and ferns of Ward's Flora and of the several supplements were 

 included by Mr. P. L. Ricker in "A List of the Vascular Plants of the 

 District of Columbia and Vicinity," mimeographed copies of which 

 were distributed among Washington botanists. Besides these there 

 are many articles dealing with certain groups, a list of which papers 

 is included in the bibliography appended to Mr. llicker's account 

 referred to above. 



The plan of the present Flora was announced at the annual meeting 

 of the Botanical Society of Washington in the spring of 1915. This 

 plan involved the cooperation of 28 botanists under the leadership 

 of Frederick V. Coville and A. S. Hitchcock, each being responsible 

 for certain families or genera. During the first season keys to the 

 genera and species of nearly all the families were prepared by the 

 contributors and mimeographed copies were distributed, in order 

 that they might be tested for one collecting season. The contribu- 

 tors prepared the finished 1 manuscript in 1917. In 1916 Mr. Coville 

 withdrew from active participation in the work and the leadership 

 was assumed by A. S. Hitchcock and Paul C. Standley. 



Following is a list of the persons who have contributed the final 

 text and of the groups assigned to each. 



Ball, C. R.: Salix. 



Blake, S. F.: Junca^eae (in part). 



Chase, Agnes: Poaceae (in part), Cyperaceae (except Carex), Xyridaceae, Eriocaula- 



ceae, Ceratopbyllaceae. 

 Coville, F. V.: Juncaceae (in part), Ericaceae, Vacciniaceae. 

 Eggleston, W. W.: Malaceae. 

 Hillman, F. H.: Cnscutaceae. 

 Hitchcock, A. E.: Solanaceae. 

 Hitchcock, A. S.: Poaceae fin part), Podostemaceae, Penthoraceae, Saxifragaceae, 



Hydrangeaceae, Escalloniaceae, Grossulariaceae, Hamamelidaceae, Platanaceae, 



Rosaceae, Amygdalaceae, Aceraceae, Clethraceae, Pyrolaceae, Monotropaceae. 

 Lewton, F. L.: Malvaceae. 

 McAtee, W. L. : Sparganiaceae, Potamogetonaceae, Naiadaceae, Pontederiaceae, 



Callitrichaceae, Capri foliaceae. 

 Maxon, W. R.: Pteridophyta, Polygonaceae, Primulaceae, Orobanchaceae, Phryma- 



ceae, Valerianaceae, Dipaacaceae, Campanulaceae, Lobeliaceae, Antcnnaria. 

 Norton, J. B.: Lemnaceae, Melanthiaceae, Liliaceae, Convallariaceae, Smilacaceae, 



Amaryllidaceae, Iridaceae. 

 Norton, J. B. S.: Commelinaceae, Euphorbiaceae. 

 Rose, J. N.: Crassulaceae, Cactaceae, Apiaceae. 

 Rosen, IT. R.: Dioscoreaceae, Anacardiaceae, Ilypericaccae, Elatinaceae, Cistaceae, 



Lythraceae, Melastomataceae, Onagraceae, Haloragidaceae. 

 Safford, W. E.: Magnoliaceae, Annonaceae, Lauraceae, Passi florae eae, Cucurbita- 



ceae. 

 Skeels, H. C: Orehidaeeao. 



Smith, C. P.: Asclepiadaceae, Convolvulaeeae, Polemoniaceae, Hydrophyllaceae. 

 Standley, P. C: Araceae, Saururaceae, Urtica f, eae, Loranthaceae, Santalaceae, 



Aristolochiaceae, Chenopodiaceac, Amaranthaceae, Allioniaceae, Phytolaccaceae, 



Aizoaceae, Portulacaceae, Corrigiolaceae, Alsinaceae, Silenaceae, Nymphaeaceae, 



