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General:
Perennial, tufted herb from short rhizomes; stems numerous, erect, 40-90 cm tall.
Leaves:
Located on the lower part of the stem, nearly circular in cross-section, tapered, stiff, with prominent complete cross-walls; sheaths open, with short, rounded, ear-shaped lobes.
Flowers:
Inflorescence terminal, conic, as wide as long to twice as long as wide, 5-20 cm long, the heads with more than 10 flowers, the branches spreading; perianth segments greenish-brown, 3.5-4.5 mm long, pointed, the inner shorter than the outer; stamens 6; anthers 0.7-1 mm long, shorter than the filaments.
Fruits:
Capsules, pointed, about as long as the perianth segments or only slightly longer; seeds spindle-shaped, about 0.4 mm long, with long, tail-like appendages on both ends that are more than 1/2 of the seed bodies.
Notes:
This species was erroneously treated as J. brevicaudatus in Ceska (1994).
Source: The Illustrated Flora of British Columbia
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