482 
TRANS, OF THE ACAD. OF SCIENCE. 
distinct ribs— semina lineolata. In some species the marks 
are coarser, in others more delicate. 
We divide the seeds, then, into semina reticulata , lineolata , 
and costata; to "both the former belong the tailless, to the 
latter the tailed seeds. 
I arrange all the species, the seeds of which I have been 
able to study, according to their surface markings, in the 
following table. Our species are in italics, the foreign ones 
in Roman type: 
l. Semina reticulata, vix seu distincte apiculata., 
1. Semina levissime irregulariter reticulata seu Iseviuscula, non costata 
nec lineolata. Omnes e Juncorum genuinorum sectione. 
J. Pacificus, compressus, filiformis, Smithii. 
2. Semina regulariter reticulata, areis lsevibus seu levissime longitudi- 
naliter lineolatis. Nostrates e Juncorum articulatorum sectione, 
pauci exotici graminifolii. 
J. militaris , Elliottii, scirpoides,pkceocephalus; J. Tasmamcus,* squar- 
rosus capitatus. 
3. Semina regulariter reticulata, areis tenuiter transverse lineolatis. 
Omnes ad J. articulatos pertinent. 
J. pelocarpus, articulatus, alpinus, pallescens, Bolanderi, hr achy carpus, 
nodosus, xiphioides, Mertensianus; J. sylvaticus, atratus, obtusiilo- 
rus, rudis, oxycarpus, supinus, Lescbenaultii. 
H. Semina transverse lineolata, levissime costata ; vix seu distincte 
apiculata seu breviter caudata. 
1. Semina areis latioribus fere transverse reticulata. E Juncorum genui¬ 
norum et graminifoliorum sectionibus. 
J.Balticus, setaceus , dichotomus. 
2. Semina areis angustissimis transverse lineolata. E Juncorum gen¬ 
uinorum et graminifoliorum sectionibus et Juncelli species unica. 
J. effusus,patens, tenuis, Gerardi, bufonius, repens, saginoides; J. glau- 
cus, pauciflorus, bulbosus. 
m. Semina costata, plus minus caudata. 
1. Semina inter costas plerumque pauciores conspicuaslineolata; apicu¬ 
lata seu breviter caudata. E Juncorum genuinorum et graminifo¬ 
liorum sectionibus. 
J. Rcemerianus, acutus, marginatus, longistylis, Buchleyi; J. mariti- 
mus. 
2. Semina inter costas plures distincte reticulata ; apiculata seu plus 
minus caudata. Ex omnibus Juncorum sectionibus. 
J. arcticus, Drummondii, Hallii , biglumis, Greenii, Canadensis, var. 
sub-caudatus. 
3. Semina inter costas numerosissimas tenues seu tenuissimas trans¬ 
verse lineolata seulaevia; caudata. Ex omnibus Juncorum sectioni¬ 
bus. 
J % Parryi, Vaseyi, triglumis, castaneus, stygius, trifidus. Canadensis, 
caudatus, asper; J. Jacquini. 
It will be observed that in this arrangement some forms 
which I consider as belonging to one specific type had to be 
separated; thus, the Pacific form has been removed from 
J. JBalticus , and the sub-caudate variety from /. Canadensis , 
proving that differences in the surface or in the shape of the 
seed alone are not sufficient to establish specific distinction. 
The Tasmanian J. falcatus, which I consider a distinct sepcies. 
