432 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: 
I. SEMINA RETICULATA, Vix seu distincte apiculata., 
1. Semina levissime irregulariter reticulata seu leviuscula, non costata 
nec lineolata. Omnes e Juncorum genuinorum sectione. 
J. Pacificus, compressus, filiformis, Smithii. 
2. Semina regulariter reticulata, areis levibus seu levissime longitudi- 
naliter lineolatis. Nostrates e Juncorum articulatorum sectione, 
pauci exotici graminifoliz. 
J. militaris, Elliottii, seirpoides, pheocephalus; J. Tasmanicus,* squar- 
rosus capitatus. 
3. Semina regulariter reticulata, areis tenuiter transverse lineolatis, 
Omnes ad J. articulatos pertinent. 
J. pelocarpus, articulatus, alpinus, pallescens, Bolanderi, brachycarpus, 
nodosus, xiphioides, Mertensianus; J. sylvaticus, atratus, obtusiflo- 
rus, rudis, oxycarpus, supinus, Leschenaultii. 
IZ, SEMINA TRANSVERSE LINEOLATA, levissime costata ; vix seu distincte 
apiculata seu breviter caudata. 
1, Semina areis latioribus fere transverse reticulata. E Juncorum genut- 
norum et graminifoliorum sectionbus. 
J. Balticus, setaceus, dichotomus. 
Semina areis angustissimis transverse lineolata. FH Juncorum gen- 
uinorum et graminifoliorum sectionibus et Juncelli species unica. 
J. effusus, patens, tenuis, Gerardi, bufonius, repens, sayinoides; J. glau- 
cus, pauciflorus, bulbosus. 
i) 
HI. Semrna costatA, plus minus caudata. 
1, Semina inter costas plerumque pauciores conspicuas lineolata; apicu- 
lata seu breviter caudata, Juncorum genuinorum et graminifo- 
liorum sectionibus. os 
J. Remerianus, acutus, marginatus, longistylis, Buckleyi; J. mariti- 
mus. 
2. Semina inter costas plures distincte reticulata ; apiculata seu plus 
minus caudata. Lx omnibus Juncorum sectionibus. i 
J. arcticus, Drummondii, Hallii, biglumis, Greenii, Canadensis, var. 
sub-caudatus. 
3. Semina inter costas numerosissimas tenues seu tenuissimas trans- 
verse lineolata seu levia; caudata. Ex omnibus Juncorum sectioni- 
bus. 
J. Parrui,-Vaseyr, 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. Balticus, and the sub-caudate variety from J. 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. 
