124 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



decided to call the erect form canadensis. So he crossed out the "3 " on his specimen 

 and wrote "philadelphicus," but did not mark a specimen "canadensis." In this 

 case the specimen marked "philadelphicus" is the nomenclatorial type of both. 

 Each is described in the second edition of the Species Plantarum, but here he fails to 

 distinguish between theni. He copies the diagnosis of E. 'philadelphicus, but not the 

 distinction he has made between that and E. canadensis. He also copies the descrip- 

 tion of E. canadensis and distinguishes that from E. sibincus without mentioning 

 E. philadelphicus. There is no doubt that all the specimens considered above are the 

 same species, E. glaucifolius Muhl., which name must give way to E. canadensis. 

 Heretofore the green form with more slender spikes has been considered typical E. 

 canadensis. E. philadelphicus becomes a synonym of E. canadensis. It is interesting 

 to note that in an article on " Demonstrationes Plantarum," « in which Linnaeus 

 gives a list of plants cultivated in the Upsala garden, he says concerning E. canadensis, 

 " Duplex in Horto occurrit; alter spica incurvata, alter spica pendula ut in E. sibirico, 

 sed structura plantae vix admittit differentiam specificam."*- 



Elymus virginicus L. Sp. PI. 84. 1753. 



The type specimen is marked "4 virginicus." Glumes and lemmas smooth, the 

 former about 1.5 cm. long, including the awn point of about 5 mm., the latter with 

 awns 1 to 1 . 5 cm . long. The Clayton specimen (no . 44 6) , corresponding to the Gronoyian 

 synonym cited by Linnaeus, is not in the British Museum. 



Elymus hystrix L. Sp. PI. 560. 1753. 



The type specimen is from Gronovius. Linnaeus has written upon it "6 Hystrix." 

 The specimen in the Gronovian herbarium at the British Museum (Clayton no. 570) 

 is the same, Hystrix hystrix (L.) Millsp. (Hystrix patula Moench.). 



Hordeum jubatum L. Sp. PL 85. 1753. 



The type specimen is marked " 6 K jubatum. " It belongs to this species as described 

 in our manuals. 



Coix dactyloides L. Sp. PL 972. 1753. 



The type specimen is marked "2 dactyloides H U." Linnaeus later includes this 

 species in his new genus Tripsacum, & of which it is the type. The specimen is the 

 ordinary form of Tripsacum dactyloides (L.) L. with three spikes. 



Tripsacum hermaphroditum L. Syst. Nat. ed. 10. 2: 1261. 1759. 



Based upon Browne, Hist. Jam. 367. 1756. I did not find a specimen of this. The 

 species is Anthephora hcrmaphrodita (L.) Kuntze (A. elegans Schreb.). 



Olyra latifolia L. Syst. Nat. ed. 10. 2: 1261. 1759. 



This is based on " Olyra, Sloan. Jam. t. 64, f. 2." Sloane's plant, which is the type, 

 belongs to the species as usually described. The Linnaean specimen from "Br" is 

 the same. 



Zizania aquatica L. Sp. PI. 991. 1753. 



One specimen marked by Linnaeus " Zizania HU" and another marked "1 aquatica" 

 are both the small narrow-leaved form named Z. aquatica angustifolia Hitchc. c The 

 blades are not over 7 or 8 mm. wide. Linnaeus gives two synonyms, Gronovius's 

 Clayton no. 574 and Sloane's plate 67, both of which are the ordinary wide-leaved form. 



Later Linnaeus described a second species, Z. palustris.d There is no specimen 

 in the herbarium marked thus. The description is quite ample, but the only 

 character given which would enable us to tell which form he had in mind is 

 that the leaves are wider than those of Arundo phragmites. ' The latter (Phragmites 

 phragmites (L.) Karst.) has blades rarely as narrow as 1 cm. and usually 2 or 3 cm. 

 wide. We may conclude, then, that he is describing the wide-leaved form, or what 



a Amoen. Acad. 3: 401. 1756. e Rhodora 8: 210. 1906. 



b Syst. Nat, ed. 10. 2: 1261. 1759. d Mant. 2: 295. 1771. 



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