RUSH FAMILY 153 



13. J. tenuis Willd. Stem 2-6 dm. high, spreading, slightly flattened, 

 striate; leaf -blades nearly as long as the stem, 1-1.25 mm. wide, flat, soft; in- 

 florescence open, 1-7 cm. long, with the flowers near the end of the branches; 

 petals and sepals 3-4.5 mm. long, lanceolate, very acute, green, with white 

 scarious margins. Roadsides and meadows: Newf. Fla. -Tex. Mont. 

 Ore. Wash. Plain -Submont. My-S. 



14. J. Dudley! Wiegand. Stem 3-10 dm. high, stiff, erect, strongly striate; 

 leaf -blades half as long as the stem or less, narrow, flat or involute; inflorescence 

 small, dense, 2-5 cm. long; sepals and petals 4-5 mm. long, lanceolate, acute, 

 yellowish green, with scarious margins; capsule ovoid, somewhat shorter than 

 the petals, rounded and apiculate at the apex, imperfectly 3-celled. Damp 

 places and meadows: Me. N.Y. N.M. Ariz. Wash. Alta.; Mex. Plain 

 Submont. My-Au. 



15. J. bufonius L. Stem 0.5-2 dm. (seldom 3 dm.) high; leaf-blades flat, 

 0.25-1 mm. wide; flowers inserted singly on the branches; sepals 4-6 mm. long, 

 narrowly lanceolate, subulate-attenuate, scarious-margined ; petals somewhat 

 shorter, less attenuate; capsule shorter than the petals, obtuse, 3-celled. Wet 

 places: Greenl. -Fla. Calif. Alaska; Mex.; also Old World. Plain -Mont. 

 Ap-S. 



16. J. sphaerocarpus Nees. Stem 0.5-2 dm. high; leaf -blades 0.5 mm. or 

 less wide; sepals 3-4 mm. long, pale, lanceolate, acuminate, slightly longer than 

 the petals, with broader scarious margins ; capsule one-half to two-thirds as long 

 as the petals, 3-celled. Wet places: Ore. -Calif. Colo. Ida. Plain Sub- 

 mont. Ap-Jl. 



17. J. triglumis L. Stem 5-15 cm. high, erect, terete, 1 mm. or less thick; 

 blades terete, 1-7 cm. long; sepals and petals ovate-lanceolate, obtuse, brown, 

 about 4 mm. long; capsule cylindric, trigonous, imperfectly 3-celled. Arctic- 

 alpine regions: Greenl. n N.Y. N.M. Alaska; Eurasia. Subalp. Alp. Jl- 

 Au. 



18. J. biglumis L. Stem erect, subterete, 3-10 cm. (rarely 2 dm.) high; 

 blades terete or nearly so, 2-7 cm. long, about 1 mm. thick; sepals and petals 

 3 mm. long, oblong, rounded-obtuse, fuscous, with more greenish back; capsule 

 trigono-cylindric, retuse, imperfectly 3-celled. Arctic-alpine regions: Greenl. 

 B.C. Alaska; Eurasia. Alp. Jl-Au. 



19. J. castaneus J. E. Smith. Stems erect, terete, 1-3 dm. high, more or 

 less leafy; blades channeled, 3-10 cm. long, 1-2 mm. thick; sepals linear- 

 lanceolate, about 5 mm. long, acute, chestnut-brown; petals obtuse; capsule ovate- 

 prismatic, trigonous, acute, imperfectly 3-celled, almost black. Arctic-alpine 

 regions: Greenl. Newf. N.M. Alaska; Eurasia. Subalp. Alp. Je-Au. 



20. J. Regelii Buch. Stem erect, terete or compressed, 2-5 dm. high, leafy, 

 1-2 mm. thick; blades 5-20 cm. long, 1-3 mm. wide, soft, many-nerved; inflores- 

 cence consisting of 1-3 globose, several-flowered heads; bractlets scarious, broadly 

 ovate, cuspidate; sepals 4-5 mm. long, lanceolate, acuminate, narrowly scarious- 

 margined; petals ovate-lanceolate, acutish, broadly scarious-margined; capsule 

 equalling the perianth, ovate, trigonous, obtuse, dark brown above. Mountain 

 meadows: B.C. Wash. Utah Mont. Mont. Subalp. Jl-Au. 



21. J. Jonesii Rydb. Stem about 2 dm. high, terete; leaf-blades 3-5 cm. 

 long, about 2 mm. wide, spreading; inflorescence capitate, or rarely with a 

 second head; sepals lanceolate, 5-6 mm. long, acute or cuspidate, green on the 

 back, brown on the sides, and with narrow scarious margins; petals ovate or ovate- 

 lanceolate, with broad margins; capsule dark brown, ellipsoid, retuse and apicu- 

 late. Mountain meadows: Utah. Mont. Au. 



22. J. longistylis Torr. Stem erect, slender, compressed, 3-5 cm. high, 

 1-1.5 mm. thick; leaf -blades 1-2 mm. wide, 5-10 cm. long; inflorescence of 1-6 

 heads; heads 5-12-flowered; sepals as in the preceding; petals broader, more 

 obtuse and with broader margins; capsule shorter than the perianth, oblong, 

 brown, trigonous above, obtuse. Meadows: Alta. S.D. N.M. Calif. 

 Ore.; Mex. Plain 'Mont. Je-Au. 



