RUSH FAMILY 151 



Stem slender; leaves narrow and long; sepals and petals 3.5-4 mm. long. 



scarious to the apex, fuscous; flowers few, congested. 



12. J. confusus. 



Capsule ovate or oval, 1-celled, three-fourths as long as the petals or less; 

 petals and sepals spreading. 13. J. tenuis. 



Aiiricles cartilaginous, yellowish brown; inflorescence greenish; capsule ovate; petals 

 and sepals spreading, 14. J. Dudleyi. 



IV. BUFONII. 



Capsule oblong to ovoid, trigonous, 3-4.5 mm. long, at maturity closely embraced by 

 the ascending petals. 15. J. bufonius. 



Capsule subglobose or short-ovoid r 2-3 ram. long: petals and sepals at maturity loosely 

 spreading, ascending, or squarrose. 16. J. sphaerocarpus. 



V. Castanet. 



Stem leafy only at the base, but the uppermost leaf often with a long sheath; perianth 



about 4 mm. long; leaves about 1 mm. in diameter; rootstock short, cespitose. 

 Lowest bract of the inflorescence more or less membranaceous, spreading; capsule 



obtuse or mucronate. , ^ 17- J* triglumis. 



Lowest bract of the inflorescence foliaceous, erect; capsule deeply retuse. 



18. J. bjglumts. 



Stem more or less leafy; leaves about 2 mm. in diameter; perianth 5^ mm. long: root- 

 stock longer, stoloniferous. 19« ^' castaneus. 



YI. Gr-\minifolii. 



Seeds caudate; ligules with lanceolate, acute auricles at the summit. 



Stem slender, 3-3 dm. high; leaves 5-20 cm. long; auricles about 1 mm. long. 



20. J. Regelit. 



Stem about 2 dm. high; leaves 3-6 cm. long, spreading; auricles of the ligiiles about 

 2 mm. long. , . , 21. J. Jonesii, 



Seeds not caudate; ligules with rounded auricles or none. «« r , • . j- 



Leaves long, erect; auricles present. 22. ./. Longtstyus, 



Leaves short and broad, ascending, spreadmg; auricles none. 23. J. orthophylius, 



VII. Unciales. 

 One species. 24. J. uncxahs, 



VIII. NODOSI. 



Stamens 6; seeds not caudate, or slightly so in J. Meriensianus and J. neradensis; peren- 

 nials with creeping rootstocks. , . ^ ,. ^-u t _ •*. ^r *^y.^ 

 Inflorescence with short branches; flowers echmat^spreadmg or the lowest of the 



heads reflexed; capsule narrowly lanceolate. 

 Heads 7-10 mm. in diameter; leaf-blades erect; petals usually longer than the 



sepals 2o. J. nodosus. 



Heads 10-16 mm. in diameter; leaf-blades usuaUy spreading; sepals longer than 



the petals 2^* '^^ ^orreyi. 



Inflorescence with elongated branches; flowers erect-ascending: capsule oblong. 

 Capsule shorter than or rarely equalling the acummate sepals and petals. 



Flowers dark brown. ^-, ^ j - 



Capsule acute. 27. J. nevadensis. 



Capsule truncate or obtuse. . . «o r . 



Heads several; leaves terete; seeds not caudate. 28. J. Iruncatus. 

 Heads solitary, or rarely 2-3; leaves somewhat flattened; seeds often 

 caudate. 29. J. Mertensianus, 



Flowers light brown or straw-colored. 36. J. columbianus . 



Capsule longer than the obtuse or acutish petals and sepals^^ ^ Richardsonianus, 



Stamens 3; seeds long-caudate; perennials with cespitose rootstocks. ^ j^^^^yi 



IX. Ensifolii. 

 Styles long, exceeding the petals by 1 mm. in length. 33. J". Tracyi, 



Style sUghtly, if at aU exceeding the petals. , ,. , ^ , ^ 



FlowerKTlusters numerous, small. 5-12-flowered. hght colored. ^^ ^ brunnescens. 



^'""Tl^^iT^^J^^i ir' Hgt^bTo^^^;- stameas 6; ligules of the ^^^eatl. usually without 

 auricles. '^^' po.rous. 



Flowers fuscous or very dark brown. , . ^ n - i „ 



St^ens 6; ligiiles of the sheaths usually produced mto^^mall aurj^es.^^^^^ 



Stamens 3; ligules without auricles. 37. J. ensifohus. 



1. J. filiformis L. Stem 1-5 dm. high, slender, 1-2 mm. thick; leaves 

 basal and reduced to bro^vn sheaths; inflorescence 6-10-flowered, open; sepals 

 4-5 mm. long, lanceolate, acute, sUghtly exceeding the obtuse or acutish petals; 

 capsule oboToid, green, about equaUing the petals, 3-celled; seeds acute, but 

 scarcely apiculate. In wet places : tJreenl.— Pa .— Utah— Wash.-Alaska ; Eurasia. 

 Plain — Submont. Je-Au. 



2. J. ater Rydb. Stem dark green, 2-6 dm. high, about 2 mm. thick; sheaths 

 InnsP. d.'irk brou-n! flowers 5-20: sepals and petals 5-6 mm. long; capsule ob- 



