All Floras      Advanced Search
FNA Vol. 22 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 22 | Juncaceae | Juncus

61. Juncus castaneus Smith, Fl. Brit. 1: 383. 1800.

Juncus castaneus var. pallidus (Hooker ex Buchenau) B. Boivin; J. castaneus subsp. leucochlamys (W. J. Zinger. ex V. I. Kreczetowicz) Hultén; J. leucochlamys W. J. Zinger ex V. I. Kreczetowicz

Herbs, perennial, strongly rhizomatous, 1--4 dm. Culms solitary, 1--2 mm diam. Cataphylls 1--2. Leaves partially cauline, 3--5, auricles absent distally, rounded proximally; blade channeled, to 20 cm, reduced distally. Inflorescences glomerules, 1--3(--5), each with 2--10 flowers; peduncles 0.4--1.5 cm; primary bracts somewhat inflated, usually surpassing inflorescence. Flowers: bracteoles absent; tepals brown or occasionally paler, lanceolate, 4.5--6.6 mm, apex acute to obtuse; inner series slightly shorter; stamens 6, filaments 2.5--3.5 mm, anthers 0.6--1.3 mm; style 1--1.3 mm. Capsules chestnut brown, 3-locular, narrowly oblong, 6.5--8.5 x 1.8--2.3 mm. Seeds pale yellow, fusiform, body 0.6--0.7 mm, tails 0.8--1.1 mm. 2n = 60, 90, 120.

Flowering and fruiting late spring--summer. Tundra, subalpine and alpine bogs and meadows, and along streams in gravelly or clayey soils; 10--3700 m; Greenland; Alta., B.C., Man., Nfld. and Labr. (Labr.), N.W.T., Nunavut, Ont., Que., Sask., Yukon; Alaska, Colo., Mont., Nev., N.Mex., Utah, Wyo.; Europe; Asia.

In southern Alaska some plants with several many-flowered heads and capsules about double the length of the perianth have been referred to the Asian Juncus castaneus subsp. leucochlamys. The distinction, however, seems dubious without further investigation.


Related Objects  
  • Distribution Map
  • Map

    Flora of China  
  • Illustration
  • Illustration

     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |