JUNCACEAE. 55 



Auricles at summit of sheaths short and carti- 

 laginous. J. dudleyi. 

 Auricles at summit of sheaths elongated and 



scarious. 



Capsule ovate or oval, 1-celled; perianth- 

 segments spreading, three-fourths the 

 length of the capsule. /. tennis. 



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. /. brachyphyllus. 



Perianth-segments fuscous, 3.5-4 mm. 

 long, scarious margined to the apex; 

 cyme congested. /. confusus. 



Flowers not bracteolate, in true heads. 



Auricles of leaf-sheaths present; perianth 



parts smooth. /. longistylis. 



Auricles of leaf-sheaths wanting; perianth 



parts rough. 



Seeds tailed. J. regelii. 



Seeds not tailed. /. orthophyllus. 



Leaves provided with distinct cross partitions. 

 Blade of the leaves equitant. 



Head black, solitary; stem terete. /. mertensianus. 



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

 Blade of the leaves cylindric or only slightly com- 

 pressed. 



Capsules subulate; bract exceeding the inflores- 

 cence. /. nodosus. 

 Capsules oblong, acute; bract not exceeding the in- 

 florescence. 



Panicle loose; heads dark brown. J. suksdorfii. 



Panicle dense; heads cinnamon brown. 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. 



Juncus 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, Kr eager. 



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 like 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 filiformis 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. 



