19 
Of these species of Luzu/a, two are new to North America, 
L. glabrata, Desv. (Rocky Mountains, Lyall, Howell), and Z. 
confusa, Lindenberg,(W ite M >1ntains, etc.) Tnis White Moun- 
tain plant has been called Z. arcuata, but that is found only 
farther north. Z. divaricata, Watson, is referred to L. parviflora, 
Desv., and Z. spadicea of American authors and its varieties be- 
come L. parviflora, Desv., the true L. spadicea, DC., not being 
credited to America. ZL. Caroline, Watson, is quoted with the 
original description and the note “ Planta mihi ignota, caruncula 
deficiente a ZL. pilosd valde diversa videtur”’ added, but the species 
is not numbered with the rest. 
The greater part of the monograph, pp. 167-463, is devoted 
to Juncus. The genus is separated into eight sub-generic 
groups: Subulati, Poiophylli, Genuini, Thalassici, Septati, Al- 
pini, Singulares, Graminifolii, of which all but two, Subulati and 
Singulares, are represented in North America. The group En- 
sifolii of Engelmann is included in the Septati. 
The new species and the changes of specific names from the 
current American nomenclature are condensed into the following 
table. The species, as recognized by Buchenau, are printed in 
Roman type, the synonyms in italics. 
Juncus Mexicanus, Willdenow = /. compressus, H.B.K. 
‘*  acutus sphaerocarpus, Engelmann = /. rodustus, Watson. 
‘*  brachycephalus Buchenau, n. sp. =_/. Canadensis brachycephalus, 
Engelm. 
‘© trigonocarpus, Steudel = /. caudatus, Chapman. 
‘«  ensifolius, Wikstrém = _/. xiphioides triandrus, Engelm. in part. 
‘* Engelmanni, Buchenau = /. scirpoides aoa Coane fet te delete, 
crassifolius, Buchenau, n. sp. ‘‘ we a a 
‘«  dubius, Engelmann = ‘« J. rugulosus, Engelmann. 
‘‘  paucicapitatus, Buchenau, n. sp. = a Sitkan plant collected by 
Mertens. 
‘*  lamprocarpus, Ehrhart, = /. articudatus, L. 
‘*  Regelii, Buchenau, n. sp. — Suksdorf, No. 678, (1888); M. E. 
Jones, /. longistylis lati folius,with- 
out number and No. 1199, (Utah). 
‘“-  Jatifolius, Buchenau, n. sp. = _/. Jongistylis latifolius, Engelm. 
In addition several changes in the disposition of varieties and 
their names are made, and a few of the species are arranged so 
as to show relationships different from those indicated by Engel- 
mann, In only one case (that of Juncus rugulosus) has one of 
. 
