on thé Genus Juncus of Linneus. 295 
varieties. The synonyms I have introduced are not numerous; but 
they have been collated with care, and I trust may be relied on. 
The Linnean genus Juncus includes a great variety of species. 
In the third edition of the Species Plantarum, eighteen are de- 
' scribed, besides a great number of varieties. Murray has twenty- 
two; Gmelin thirty-five; Lamarck, in the Encyclopedia Methodique, 
thirty-two; Willdenow, forty ; and Rostkov, fifty-two. Almost all 
the new ones belong to the true Junci; and it is fortunate for 
science that so numerous a tribe may be so naturally and easily 
subdivided: Ist, into those with LEAFLESS sTEMs, including 
the original and true Rushes, beginning with Juncus acutus and 
ending with J. filiformis: 2dly, Such as have cHANNELLED 
LEAVES, embracing among the British species the Linnean bulbo- 
sus, bufonius, trifidus, and uliginosus; J. squarrosus belongs to 
this series, but does not follow any other species with a very close 
affinity ; J. trifidus connects itself with the leafless subdivision by 
its entire want of leaves in some situations, and in some degree 
with the Luzude by its fimbriated scales: it is. nearly allied to 
uliginosus, with which it is linked by the supinus of Hoffman 
and Don’s Herbarium Britannicum: 3dly, Those with JoINTED 
LEAVES succeed, a most distinct and natural family, connected 
with the last subdivision by J. triglumis and biglumis, which have 
cellular-knotted leaves, and ending in the new species, which 
were included by Linnæus in his articulatus. This series, in order 
to connect it with the former, begins with those which are least 
complete in the joints of the leaves, and ends with such as have 
the most distinct and perfect articulations. It would seem, in- 
deed, as if the channelled leaves of this genus were imperfect 
articulate leaves. 
It is necessary to add a word or two in explanation of some 
terms I have used in | my descriptions differently from some other 
botanists. - 
