524 Morris : North American Plantaginaceae 



very probably to incomplete fecundation of the ovules. It is 

 highly significant, too, that the collections of this species in Cali- 

 fornia seem to have ceased with the 1890*5 ; especially significant, 

 with such men as Heller, Abrams, Orcutt, Parish, and others in 

 the field since that time.. Under the data available, the present 

 conclusion is that P. heterophylla Nuttall, 1837 {P. calif ornica 

 Greene, 1885), was for a few years adventive in CaUfornia, 



It is a pleasure gratefully to acknowledge the kindness and 

 interest of officers of institutions, and others, who have offered or 

 sent material for study ; and duly to credit them under each 

 species. 



Key to species treated iii tliis paper 



[Biennials (normally). P, virginica group.] 

 Annuals, seeds pitted. 



Seeds 4, small, symmetrical. 



Pacific Slope native species. Bracts carnulose- 



keeled, pitted when dry P, Bigdovii, 



Central and Eastern native species. Bracts not 



pitted when dry. 



Campestrian, above 305 meters elevation ( 



1000 ft.). Bracts saccate-keeled ; 



seeds four times as long (2' mm.) as 



broad..... P, elongata. 



Mississippi drainage, Gulf region, Atlantic 



Slope and Coast, low elevations. Bracts 



not keeled, though somewhat swollen ; 



seeds not more than three times as long 



as broad. 



Leaves usually entire ; seeds about two and 



a half times as long (i mm.) as broad. 



(Introduced and naturalized in Puget 



Sound region and tributaries.) P. pusilla. 



Leaves usually distantly laciniate-toothed ; 



seeds about three times as long (i.S 



mm.) as broad, (Known only from 



Indian Territory east to Missouri River. ) P, pusilla Engelmanni, 

 Seeds 10-30 (or fewer by abortion), minute, unsym- 



metrical..... />, heterophylla. 



Plantago Bigelovii a. Gray, in Whipple, Pacif. R. R. Rep. 4: 



117. 1857; descript, emend. Bot Calif, i: 612. 1876, Not 



P. Bigelovii S. Watson, Bot. King Exped 5: 212. 1871. 



A low, erect, subcarneous, acaulescent annual. Roots one or 

 two, with the secondaries fibrous, slender, numerous. Leaves 

 basal, erect to ascending, more or less carnulose, glabrous to spar- 



