Jiuicus Duirylnatus and its Varieties. 125 



Texas: Di-uminond, F. Liudheiiuer, No. 193, 184.']; Corpus Christi, H. 



W. Ravenel, April 30, 1869; Houston, Eliliu. Hall, PI. Tex. No. 657, 



April 20, 1872. 

 Arkansas: Little Rock, F. L. Harve}-, June, 1880. 

 Louisiana: Port Eads, on ballast ground, A. B. Langlois, May 6, 1885. 

 Mexico : Near Morales, San Luis Potosi, J. G. Schaffner, No. 500, 1876 ; 



Rio Blanco, Jalisco, Edward Palmer, No. 13, June 8, 1886. 



The considerations whicli have led to the disposition of the 

 species formulated above may be given in sufficient detail to 

 aid the future student who goes over the same ground. 



The type s})ecimen of Jaiicus marginatuSj which is probal)ly at 

 Berlin, it has not been possible to consult, but Rostkovius's ex- 

 cellent figure, as well as his description of the plant, " culmns 

 eredus 'pedalis vel sesqidpedalis,^^ " corymbas tenninalis simplex,'''' 

 and " capitula octo- vel decemflora,^^ besides the type locality, Penn- 

 sylvania, leave no doubt as to the identity of the type form. 

 The ty})e specimen of Jimcus cylindricus, a fragment of which I 

 have been able to examine in the Engelmann herbarium, bears 

 heads with abnormally elongated axes and many flowers. It 

 belongs clearly to some form of Jimctts marginatus, probably to 

 the type form. Dr. Engelmann, following a practice in com- 

 mon European use, gave to what he considered the type form a 

 varietal name, vulgaris, which, by reference to No. 38 of his 

 Herbarium Normale, is seen clearly to be identical with Rost- 

 kovius's plant. An examination of the type specimen ofjimcus 

 marginatus paucicapitatus in the Engelmann herl:)arium shows 

 that it belongs to the ty|)e form of Juncus viarginatus, and indeed 

 closely resembles Rostkovius's original figure of the species. 



The plant for which the name Juiicu~s marginatus aristalatus is 

 here ado})ted has been known currently as Juncus marginatus 

 bifiorus. Micluiux's Juncus aristulatus has been referred by vari- 

 ous authors to Juncus marginatus without particular com{)arison 

 with any of its forms, but an examination of his description 

 leaves no doubt regarding the plant he was descrilnng, for in 

 the expression " glomerulis trijioris " he names the most con- 

 spicuous external feature of this variety. Persoon's specific name 

 aristatus is an error for aristulatus, for Persoon cited Michaux as 

 the author of the name, with reference to the page of publica- 

 tion, and quoted his description with but slight changes. Re- 

 garding Juncus bifiorus, it should be said that Elliott included 

 in his book descriptions of two plants of the marginatus group, 



