RUSH FAMILY 



363 



-1 '^ 



OS) 



Juncus richardsonianus Schiilt. 

 Richardson's Rush. Fisf. 887, 



Fig. 



Juncus richardsonianus Scluilt. in Koem. & Schult. Svst. 7 : 



201. 1829. 

 Juncus alpinus insignis Fries; Engelm. Trans. St. Louis Acad. 



2: 458. 1866. 



Stems erect. 15-25 cm. high, in loose tufts, from 

 creeping rootstocks. Stem leaves 1-3, usually borne 

 below the middle, conspicuously septate ; panicle 6-20 

 cm. high, loose, its branches strict or slightly spread- 

 ing ; heads 3-12-flo\vered ; perianth 2-2.5 mm. long ; 

 inner segments shorter than the outer, obtuse, usually 

 purplish toward the apex, the outer paler, obtuse, 

 mucronate or acute; stamens 6, one-half to two-thirds 

 as long as the perianth ; anthers much sliorter than 

 the tilaments ; capsule ovoid-oblong, slightly exceeding 

 the perianth, straw-colored or brown, broadly acute or 

 obtuse with a short tip ; seed ovoid to oblong, apiculate, 

 acute or acuminate at the base, shallowly reticulate, the 

 areolae smooth. 



Shores of lakes and ponds. Canadian Zone: .\laska to Greenland, south to Washington, Idaho, Nebraska 

 and Pennsylvania. In Washington it has been found in Chelan and Whatcom Counties. Type locality: 

 "In sylvis Americae arcticae." 



34. Juncus mertensianus Bong. 

 Mertens" Rush. Fig. 888. 



Juncus mertensianus Bong. Mem. Acad. St. Petersb. \'l. 2: 167. 1832. 

 Juncus mertensianus filifolius Suksdorf. Deutsch. Bot. Monatss. 19: 92. 1901. 



Stems slender and weak, 15-45 cm. high, from slender matted 

 rootstocks. Leaves 2-3 on the stem, sheaths with auricles, blades 

 very slender, somewhat compressed, equalling or shorter than the 

 stems, 1 mm. wide, the septa often obscure ; heads usually solitary, 

 densely many-flowered, becoming spheroidal ; perianth 4 mm. long, 

 dark brown, the segments nearly equal, lanceolate, the outer 

 acuminate, the inner acute ; stamens nearly equalling the perianth ; 

 anthers much shorter than the filaments ; capsule narrowly oval, 

 obtuse or emarginate at apex, mucronate, equalling the perianth, 

 dark brown ; seeds ovate-lanceolate, the reticulations finely cross- 

 lined. 



Mountain meadows, Canadian to Arctic Zones; Sitka to southern Cali- 

 fornia, east to Colorado. Type locality: Sitka, Alaska. 



35. Juncus chlorocephalus Engelm. 

 Green-headed Rush. Fig. 889. 



Juncus chloroceplialus Engelm. Trans. St. Louis .\cad. 2: 485. 1868. 



Stems tufted from slender matted rootstocks, very slen- 

 der, 2-6 dm. high. Basal sheath bladeless, often rose- 

 colored, stem leaves 3-4, the sheaths with broad scarious 

 margins and prominent auricles, the blades somewhat com- 

 pressed, 4-10 cm. long, scarcely 1 mm. in diameter, con- 

 spicuously septate ; heads solitary or in few-headed pan- 

 icles, few-many-flowered ; perianth 4 mm. long, light green 

 with broad scarious margins ; the segments equal, oblong- 

 lanceolate, obtuse ; stamens three-fourths the length of the 

 segments : anthers longer than the filaments ; capsule oblong, 

 obtuse, about two-thirds the length of the segments. 



Mountain meadows, Canadian Zone; Sierra Nevada, California 

 from Eldorado to Mariposa Counties. Also adjacent Nevada. Type 

 locality: Sierra Nevada, California. 



.^SCW't^ 



