JUNCACEAE. 



55 



Auricles at summit of sheatiis short and carti- 

 laginous. 

 Auricles at summit of sheaths elongated and 

 scarious. 

 Capsule ovate or oval, 1-celled; perianth- 

 segments spreading, three-fourths the 

 length of the capsule. 

 Capsule oblong, 3-celled ; perianth-segments 

 erect, about equalling the capsule. 

 Perianth-segments straw-colored, 4 mm. 

 long, the outer scarious only at base; 

 cyme rather crowded. 

 Perianth-segments fuscous, 3.5-4 mm. 

 long, scarious margined to the apex; 

 cyme congested. 

 Flowers not bracteolate, in true heads. 



Auricles of leaf -sheaths present; perianth 



parts smooth. 

 Auricles of leaf -sheaths wanting; perianth 

 parts rough. 

 Seeds tailed. 

 Seeds not tailed. 

 Leaves provided with distinct cross partitions. 

 Blade of the leaves equitant. 



Head black, solitary; stem terete. 

 Heads black or brown, 2-many; stem 2-edged. 

 Blade of the leaves cylindric or only slightly com- 

 pressed. 

 Capsules subulate; bract exceeding the inflores- 

 cence. 

 Capsules oblong, acute ; bract not exceeding the in- 

 florescence. 

 Panicle loose; heads dark brown. 

 Panicle dense; heads cinnamon brown. 



/. tenuis. 



J. brachyphyllus. 

 J. confusus. 

 J. longistylis. 



J. regelii. 



J. orthophyllus. 



J. mertensianus. 

 J. ensifolius. 



J. nodosus. 



J. suksdorfii. 

 J. columbianus. 



Juncus subtriflorus (Meyer) Coville. Tufted; stems slender, 10-25 cm. 

 high; inner leaf-blades reduced to bristles; bract as long as or longer than the 

 inflorescence; perianth segments acute or acuminate, brownish, the outer 

 longer, exceeding the brown oblong retuse capsule. Alpine on the higher 

 parts of the Blue Mountains. 



Jtmcus parryi Engelm. Densely tufted; stems 20-40 cm. high; inner leaf 

 blades not reduced ; bract much exceeding the inflorescence ; perianth segments 

 brown, acute, the outer 7 mm. long, slightly exceeding the inner; capsule 

 oblong, acute, exceeding the perianth. Mt. Carlton, Kreager. 



Juncus balticus Willd. Stems erect, terete, naked, 30-60 cm. tall, from 

 stout horizontal rootstocks; leaves consisting only of sheaths; panicle appar- 

 ently lateral, the elongated bract appearing Hke a continuation of the stem; 

 panicle simple or compound, 1-10 cm. long; perianth segments lanceolate, 

 acute, or obtusish, about 4 mm. long, usually brown; stamens 6; capsule 

 acutely angled and short-beaked; seeds oblong, the surface reticulated. 

 Abundant in wet places. 



Juncus filifoTinis L. Stems very slender, 15-60 cm. high, most of them 

 usually sterile; sheaths obtuse, the blades small and bristle-like; inflorescence 

 few-flowered, cymose, nearly simple; segments of the perianth green, lanceolate, 

 acute, the inner a little shorter, about 3 mm. long; capsule green, obovoid, 

 shorter than the perianth; seeds thick, short-pointed at each end. Lake 

 Tesemini, Idaho. 



