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. 



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

 petals and sepals spreading. 13. J. tenuis. 



Auricles 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, 2-3 mm. long; petals and sepals at maturity loosely 

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



V. Castanei. 



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 foUaceous, erect; capsule deeply retuse. 



18. J. biglumis. 

 Stem more or less leafy; leaves about 2 mm. in diameter; perianth 5-6 mm. long; root- 

 stock longer, stolon if erous. 19. J. castaneus. 



VI. Gr.\minifolii. 

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



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



20. J. Regelii. 

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

 2 mm. long. 21. J. Jonesii. 



Seeds not caudate; ligules with rounded auricles or none. 



Leaves long, erect; auricles present. 22. J. lonaistylis. 



Leaves short and broad, ascending, spreading; auricles none. 23. J. orthophyllus. 



VII. Unciales. 

 One species. 24. J. uncialis. 



VIII. NODOSI. 



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

 nials with creeping rootstocks. 

 Inflorescence with short branches; flowers echinate-snreading or the lowest of the 

 heads refle.xed; capsule narrowly lanceolate. 

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



sepals. 25. j. nodosus. ■ 



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

 the petals. 26. J. Torrevi. 



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

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

 Flowers dark brown. 



Capsule acute. 27. J. nevadensis. 



Capsule truncate or obtuse. 



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

 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. 



31. J. Richardsonianus. 

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



32. J. Ticeedyi. 

 IX. Ensifolii. 



Styles long, exceeding the petals by 1 mm. in length. 33. J. Tracy i. 



Style slightly, if at all exceeding the petals. 



Flower-clu.sters numerous, small, 5-12-flowered, light colored. 



^ 34. J. brunnescens. 



Flower-clusters few. 15-25-flQwered. 



Flowers greenish or light brown; stamens 6; ligules of the sheaths usually without 



auricles. 35. J. parous. 



Flowers fuscous or very dark brown. 



Stamens 6; ligules of the sheaths usually produced into small auricles. 



36. J. saiimontanus. 

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



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

 basal and reduced to brown sheaths; inflorescence 6-10-flowered, open; sepals 

 4^5 mm. long, lanceolate, acute, slightly exceeding the obtuse or acutish petals; 

 capsule obovoid, green, about equalling the petals, 3-celled; seeds acute, but 

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

 Plain — Siibmont. Je-Au. 



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

 loose, dark brown; flowers 5-20; sepals and petals 5-6 mm. long; capsule ob- 



