on the Genus Juncus of Linnaus. 321 



Habitat in locis irriguis sumniarum alpium, rarissim^. 



Peren. August. 



Jloot 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. Cahjx-leajiets lanceolate, 

 pointed, equal, keeled, chocolate-coloured. Stamens longer than 

 the calyx. Capsule large, turbinate, retuse, chocolate-coloured 

 above, longer than the calyx. jSeerfs 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. 

 Juncus foliis plants amplexicaulibus, capitulo terminali subge- 

 mino multifloro basi foliato, bracteis acutis. Flor. Brit, 383. 

 Rost. Monograph. 49- -En^. Bot. xiii. 900. 

 J. Jacguini, folio subulato, capitulo terminali subquadrifloro. 



Sym. Si/n. 87- Hull. 76. ' 

 Habitat in alpibus Scotiae, solo micaceo udo. 

 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 above; 

 sheathing, folded and dilated at the base so as to make a sharp 

 keel. Heads terminal, erect, one above the other, from three 



to 



