RUSH FAMILY 155 



petals 4 mm. long, lanceolate, acute or acuminate, light brown; capsule dark 

 brown, oblong, acute, 3-angled, about one-fourth longer than the perianth. J. 

 canadensis coarctalus Coulter, not Engelm. J. canadensis Kuntzei Buch. Bogs 

 and wet meadows: Mont. -Wyo. Utah. Submont. Mont. Jl. 



33. J. Tracyi Rydb. Stem stout, 3-6 dm. high, compressed; blades 5-20 

 cm. long, 2-4 mm. wide; sheaths with a scarious margin which usually is pro- 

 duced into a very short auricle; inflorescence of 5-9 heads; these about 1 cm. in 

 diameter; sepals and petals lanceolate, acute, light brown, 3-4 mm. long, slightly 

 scarious-margined ; capsule oblong, mucronate, shorter than the perianth, im- 

 perfectly 3-celled. Meadows: Utah Nev. Ida. Submont. Jl-O. 



34. J. brunnescens Rydb. Stem 4-6 dm. high, more or less winged; leaves 

 1-2.5 dm. long, 2-5 mm. wide; sheaths with scarious margins, abruptly contracted 

 above, but scarcely auricled; panicle open, 5-10 cm. long, with 10-60 small 

 heads,' petals and sepals subequal, lanceolate, acuminate, about 3 mm. long, 

 light brown, with green midrib; capsule lance-ovoid, acute. Mountain meadows: 

 Colo. N.M. Ariz. Nev. Submont. Je-Jl. 



35. J. parous Rydb. Stem 3-6 dm. high, distinctly winged; leaves 2-3 dm. 

 long, 3-5 mm. wide; petals and sepals lanceolate, sharply acuminate, subequal, 

 light brown or greenish on the back; capsule oblong, acute, shorter than the 

 petals. Mountain meadows: Colo. N.M. Submont. Subalp. Je-Jl. 



36. J. saximontanus A. Nels. Stem winged, 2-5 dm. high; leaf-blades 

 3-20 cm. long, 2-4 mm. wide; inflorescence of 2-15 heads; these about 1 cm. 

 thick; sepals and petals lanceolate, acuminate, about 3 mm. long, dark brown; 

 capsule oblong, mucronate, a little shorter than the perianth, dark brown. J. 

 xiphioides montanus Engelm. Meadows and wet places: B.C. Calif. N.M. 

 Alta. Submont. Mont. Je-S. 



37. J. ensifolius Wikstr. Stem erect, 3-6 dm. high, winged; leaf -blades 

 more or less falcate, 5-30 cm. long, 3-6 mm. wide; heads about 1 cm. thick, 

 about 25-flowered; sepals and petals dark brown, lanceolate, acuminate, about 

 3 mm. long; capsule oblong, acute, often slightly exceeding the perianth, 3- 

 gonous. J. xiphiodes triandrus Engelm. Meadows and wet places: Alaska 

 Calif. Utah Alta. Submont. Je-Au. 



2. JUNCOIDES (Dill.) Adans. WOOD-RUSH. 



Perennial caulescent herbs, with rootstocks, glabrous or sparingly pubescent. 

 Leaf -sheaths closed; blades grass-like. Inflorescence umbel-like, capitate or 

 spike-like. Flowers always subtended by usually lacerate or dentate bractlets. 

 Stamens 6. Capsule 1-celled; ovules and seeds 3, basal. Seeds reticulate, 

 sometimes apiculate but never tailed. [Luzula DC.] 



Flowers on slender pedicels in a corymbiform inflorescence. 

 Petals and sepals 1.5-2 mm. long. 



Flowers and capsule pale green; leaves thin, shining; seeds brown, ellipsoid. 



1. J. parviflorum. 

 Flowers and capsule dark brown: leaves thick, dull; seeds yellow, constricted at 



each end. 2. J. Piveri. 



Petals and sepals 3-3.5 mm. long. 3. J. glabratum. 



Flowers subsessile in head-like or spike-like clusters. 



Blades at least of the lower leaves flat, not attenuate into a subulate tip. 

 Spikelets peduncled, forming a corymb. 



Flowers light yellow. 4. J. comosum. 



Flowers brown or ferruginous. 5. J. intermedium. 



Spikelets subsessile, forming a compound spike. 



Plant tall, 4-5 dm. high; inflorescence subcapitate; stem-leaves broad and flat; 

 bractlets not ciliate. 6. J. subcapitatum. 



Plant 1-2, dm. rarely 4 dm. high. 



Bractlets ciliate; spike usually elongate and often nodding; stem-leaves 



narrow, attenuate. 7. J. spicatum. 



Bractlets lacerate, not ciliate: spike short, capitate. 8. J. arcticum. 

 Blades of the leaves attenuate into subulate, almost pungent tips. 



Spikelets many-flowered; the lower on suberect or ascending peduncles; leaves 



erect. 9- J- hypcrboreum. 



Spikelets few-flowered on arcuate-spreading peduncles; leaves arcuate-spreading. 



10. J. arcuatum. 



