[From the BULLETIN OF THE ToRRKY BOTANICAL CLUB, 31 : 399-4IO. July, 1904 ] 



Studies on the Rocky Mountain flora — XI. 



Per Axel Rydberg 



Juncus balticus vallicola var. nov. 



Stem from a horizontal rootstock, rather stout, 6-8 dm. high, 

 terete, 2-4 mm. in diameter ; sheaths at the base short, dark brown, 

 bladeless ; bract 1-2 dm. long ; bractlets broadly ovate, scarious, 

 brown, abruptly acuminate ; inflorescence open ; its branches 4-8 

 cm. long ; sepals narrowly lanceolate, slightly if at all scarious on 

 the margin, attenuate at the apex, about 6 mm. long ; petals much 

 broader and shorter with broad scarious margin, about 5 mm. long ; 

 anthers about 4 times as long as the filaments ; capsules short 

 ovoid, obtusish and mucronate, shorter than the petals. 



This variety has the open inflorescence and general habit of var. 

 litoralis but the fruit of var. montanus. It differs from both, how- 

 ever, in the long-attenuate sepals. It grows in wet ground, both 

 in alkaline and sandy or gravelly soil in the valleys of the Rocky 

 Mountain region. 



Wyoming : Point of Rocks, 1901, E. D. Merrill & E. N. Wil- 

 cox, 664 (type)* ; Big Sandy River, 730 ; Steamboat Mountain, 

 1900, Aven Nelson, 7073. 



Colorado: Mancos, 1898, Baker, Earle & Tracy, 438. 



Utah : Antilope Island, Stansbury. 



Juncus truncatus sp. nov. 



J. alpinus insignis Coult. Man. 358 (in part as to the Colorado 



specimens). 1885. 



Stems slender, 3-5 dm. high, terete or slightly flattened ; leaves 

 1.-3 dm. long, slightly flattened laterally or nearly terete, 1-2 mm. 

 in diameter, septate ; sheaths with scarious margins which end in 

 rounded auricles, which are I — 1 . 5 mm. wide ; bract 1-3 cm. long, 

 lanceolate or subulate, brown with green back ; inflorescence open, 

 2—5 cm. long, irregularly cymose with 4—10 heads ; bractlets ovate, 

 brown, acuminate-cuspidate ; heads 6-9 mm. in diameter, 5-10- 

 flowered ; petals and sepals lanceolate, dark brown, about 3 mm. 

 long, acuminate, longer than the capsule which at maturity is 

 truncate or slightly emarginate at the apex : seeds not caudate. 



* Unless otherwise stated the types are preserved in the herbarium of the New York 

 Botanical Garden. 



399 



