204 Fr. Buchenau. — Juncaceae. 



cataphyllina usque 3 cm longa, sequentia et caulina (1 vel 2) frondosa; vagina an- 

 gusta; lamina gracilis, diam. 0,5 usque 0,8 mm; folium supremum parvum, vagina 

 saepe rubescente. Inflorescentia composita, umbelloides, rarius anthelata (vel simplex); 

 rami erecti; capitula hemisphaerica, 3- usque 10-flora. Flores ca. 4 mm longi; tepala 

 aequilonga vel subaequilonga, lanceolata, acuta vel mucronata, interna late membranaceo- 

 marginata; stamina 6, tepalis ca. J / 3 breviora; antherae filamentis usque duplo lon- 

 giores. Fructus perigonio paullo brevior, trigono-ovatus, mucronatus, nitidus. Semina 

 ca. 0,6 mm longa, oblique obovata, vitellina, apice et basi albo-apiculata, rectangu- 

 lariter reticulata. 



Provinz der pacifischen Goniferen: Auf feuchten Alpenwiesen und an Ge- 

 birgswassern von Californien, Oregon, Washington; Vancouvers-Insel (Macoun). 



Nota. Quid J. iruncatus Rydberg in Bull. Torr. Bot. Club, XXXI. (1904) 399? »J. alpinus 

 insignis Coult. Man. 358 (in part as to the Colorado specimens«. »Sterns 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 1 — 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 diam., 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«. 



> This species is mostly related to J. nevadensis, Mertensianus and Richardsonianiis, with 

 which three it has been confused. It differs from the first in the truncate capsule, from the 

 second in the paniculate inflorescence and not caudate seeds, and from the last in the dark 

 acuminate petals and sepals and the short capsule. It grows in wet meadows at an altitude 

 of 1800—2700 m«. 



Colorado: Shar et Bess. n. 4323; Crandall. 



Wyoming: Tweedy n. 4335; Av. Nelson n. 3981 ; Williams, 1897. 



12 4. J. chlorocephalus Engelm. in Trans. St. Louis Acad. II. (1868) 485; 

 Watson, Un. St. geol. Explor. fort. Parallel (1871) 359 et Botany of California II. 

 (1880) 210; Buchenau, Monogr. Juncac. (1890) 353. — Laxe caespitosus. Caules 

 graciles, 20 usque 45 cm alti, laeves, diam. 0,75 usque 1,2 mm. Lamina gracilis, 

 caule brevior. Inflorescentia simplex, vel e capitulis 2 vel 3 (lateralibus breviter stipi- 

 tatis) composita; capitula subglobosa, diam. 11 usque 14 mm, 15- usque 25-flora; 

 bractea infima frondescens, brevis. Flores ca. 4,5 mm longi, luteo- sive rubescenti- 

 albi ; tepala aequilonga, elongato-oblonga, obtusa, fere tota membranacea; stamina 6, 

 tepalis paullo breviora; stilus tenuis; Stigmata longa, exserta. Fructus .... (much 

 shorter than the sepals, Engelm.). 



Provinz der pacifischen Coniferen: An Bergbächen und auf alpinen Gras- 

 plätzen von Californien (Engelmann hb. norm, n 99; Bolander et Kellogg n. 6033; 

 Hillebrand n. 2304; Brewer n. 1804) und Nevada (Anderson teste Engelmann). 



125. J. dubius Engelm. in Trans. St. Louis Acad. II. (1868) 459; W^atson, Bot. 

 Calif. II. (1880) 209; Buchenau, Monogr. Juncac. (1890) 350; Coville in Contr. Un. 

 St. Nat. Herb. IV. (1893) 206. — Rhizoma horizontale, diam. 2 usque 3,5 mm, inter- 

 nodiis distinctis (rarius usque 30 mm longis). Caules plus minusve compressi, 30 

 usque 75 cm alti, diam. ca 2 mm. Folia basilaria cataphyllina, caulina (2 usque 5) 

 frondosa; lamina teres. Inflorescentia supradecomposita, anthelata, ramis elongatis, 

 plerumque erectis; capitula discreta, 6- usque 10-flora; bractea infima frondescens, 

 brevis. Flores ca. 3, cum fructu fere 4 mm longi; stamina 6, tepalis ca. y 3 breviora; 

 antherae lineares ; ovarium conico-elongatum ; Stigmata longissima. Fructus perigonium 

 superans, triquetro-prismaticus, brevius longiusve rostratus, nitidus; semina 0,35 usque 

 0,4 mm longa, obovata, apiculata, rectangulariter reticulata, areis transversim lineolatis. 



Provinz der pacifischen Coniferen: Auf feuchtem Sande und an Ufern große 

 Rasen bildend: Californien, Oregon. 



Nota. J. rugulosus Engelm. in Bot. Gazette VI. (1881) 224 — San Bernardino Mountains 

 und Castac Lake, Calif. — differt a J. dubio superficie caulium foliorumque transversim rugosa 



