432 TRANS. OF THE ACAD. OP 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 

 hitter 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 Iseviuscula, non costata 



nee lineolata. Omnes e Juncorum genuinorum sectione. 

 J. Pacificus, compressus,filiformis, Smithii. 



2. Semina regulariter reticulata, areis laevibus seu levissime longitudi- 



naliter lineolatis. Nostrates e Juncorum articulatorum sectione, 

 pauci exotici graminifolii. 

 J. militoris, Elliottii, scirpoides,phozocephalus ; J. Tasmanicus,* squar- 

 rosus capitatus. 



3. Semina regulariter reticulata, areis tenuiter transverse lineolatis. 



Omnes ad J. articulatos pertinent. 

 ■ J. pelocarpus, articvlatus, alpinus, pallescens, Bolanderi, brachycarpus, 

 nodosus, xiphioides, Mertensiamts ; J. sylvaticus, atratus, obtusiflo- 

 rus, rudis, oxycarpus, supinus, Leschenaultii. 



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 sectiombus. 

 J. Balticus, seiaceus, dichotomus. 



2. Semina areis angustissimis transverse lineolata. E Juncorum gen- 



uinorum et graminifoliorum sectionibus et JuncelU species unica. 

 J. effusus, patens, tenuis, Gerardi, bufonius, repens, saginoides; J. glau- 

 cus, pauciflorus, bulbosus. 



HI. Semina costata, plus minus caudata. 



1. Semina inter costas plerumque pauciores conspicuas lineolata; apicu- 



lata seu breviter caudata. E Juncorum genuinorum et graminifo- 

 liorum sectionibus. 

 J. Rozmirianus, acutus, marginatus, longistylis, Buckley i; 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 seu lsevia; 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. 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. 



* Tbe Tasmanian J.falcatus, which. I consider a distinct sepcies. 



