on the Genus Juncus of Linneus. 321 
Habitat in locis irriguis summarum alpium, rarissime. 
Peren. August. | 
Root fibrous. Stem three or more inches high, leafy, simple, stri- 
ated. Leaves compressed, jointed, erect, sheathing, pointed. 
Flowers terminal, binate, unilateral, one above the other; upper 
one on a short footstalk. Bractes two; larger one foliaceous, 
erect, forcing the fruit on one side. Calyz-leaflets lanceolate; 
pointed, equal, keeled, chocolate-coloured. Stamens longer than 
the calyx. Capsule large, turbinate, retuse, chocolate-coloured 
above, longer than the calyx. Seeds numerous; appendage elon- 
gated at each end. 
This rare plant has been found with us only in | Scotland, parti: 
cularly on Ben Lawers in Breadalbane. The old botanists were - 
unacquainted with it; and even Lightfoot suspected it might be 
a variety of J. triglumis. The two species are, however, perfectly 
distinct, and may be recognised at once by observing that one of 
the bractes in J. biglumis is much longer than the flowers, and the 
capsule turbinate. The seeds are remarkably distinguished by 
their covering. 
17. JUNCUS CASTANEUS. 
Ju uncus foliis planis amplexicaulibus, capitulo terminali subge- 
mino multifloro basi foliato, bracteis acutis. Flor. Brit. 383. 
Rost. Monograph. 49. Eng. Bot. xiii. 900. 
J. Jacquini, folio subulato, e terminali subquadrifloro. 
Sym. Syn. 87. Hull.76. | 
Habitat in alpibus Scotiæ, ‘solo micaceo Fido. 
Peren. July. | 
Root creeping, with runners. Stem erect, straight, from six to 
twelve inches high, cylindrical, solitary, leafy. Leaves princi- 
pally on the stem, alternate, erect, compressed, jointed abi ov 
sheathing, folded and dilated at the base so as to make a sharp 
keel. Heads terminal, erect, one above the other, from three 
to 
