52 JUNCACEAE 



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



obtuse or mucronate. , 17. J. tri^umis. 



Lowest bract of tbe inflorescence foliaceous, erect; capsiile deeply retiise. 



18. J. biglumis. 

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

 stock longer, stoloniferous. 19. J. castaneus, 



VI. GRAMINIFOLn. 



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. Begelii. 



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. longistylis. 



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



VII. Unciales. 



One species. 24. J. uncialis. 



VIII. NODOSI. 



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

 nials with creeping rootstoclS. 

 Inflorescence with short branches; flowers echinate-spreadlng 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. 25. J. nodosus. 



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

 the petals. 26. J. Torreyi. 



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. truncatus. 

 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. Tweedyi. 

 IX. ENiSIFOUI. 

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



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-flowered. 



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



auricl^. 35. j'. parous. 



Flowers fuscous or very dark brown. 



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



_, o ,. . .^^ ^ . , 36. J. saximontanus. 



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



2. JUNCOIDES (DiU.) Adans. WooD-RUf3H. 



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. 



Flowers and capsule dark brown; leaves thick, duU; seeds yeu'ow," constrtated'at 

 each end. 2 »/ Pineri 



Petals and sepals 3-3.5 mm. long. 3' j aldbraium 



Flowers subsessUe in head-like or spike-like clusters. ■ ■ y 



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

 Spikelets peduncled, forming a corymb. 



Flowers Ught yeUow. 4 j comosum. 



Flowers brown or ferruginous. 5 j intermedium 



Spikelets subsessile, forming a compound spike. miermeaium. 



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



bractlets not ciliate. r r ,,,}„.„„ii„u,m 



Plant 1-2, dm. rarely 4 dm. high. ^- ^^'"^'^P^tatum. 



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

 narrow, attenuate. 7 j^nicaturn 



T>i ., , Bractlets lacerate, not ciUate; spike short, capitate. 8. J.'arcticum 

 Blades of the leaves attenuate mto subulate, almost pungent tips 



Spikelets many-flowered; the lower on subereot or ascending peduncles; le.aves 



Spikelets few-flowered on arcuate-spreading peduncles; leaves^arcuat£siHSidUug. 



10. J. arcualum. 



Family 20. ALLIACEAE. Onion Family. 



Perianth-segments distinct or nearly so; style articulate to the 3-lobed capsule- bracts 

 broad, spathaceous. 1_ Allium "'•^^''^ 



