JUNCACEAE (RUSH FAMILY) 109 



1. Luzuk parviflora (Ehrh.) Desv. Journ. Bot. 1: 144. 1808. Stems slen- 

 der, tufted, 3-6 dm. high: leaves narrowly lanceolate, 7-15 cm. long, 6-12 mm. 

 wide: inflorescence a loose decompound panicle, commonly 7-10 cm. high, its 

 lowest bract foliaceous, seldom more than one fourth the length of the panicle: 

 flowers borne singly or 2-3 together on the branches of the panicle, on slender 

 pedicels; bractlets ovate: perianth 2-3 mm. long, its segments ovate, acumin- 

 ate, slightly exceeded by the green to brown ovoid capsule. Either moist or 

 dry ground in the woods; throughout our range and across the continent 

 northward. 



2. Luzula spicata (L.) DC. Fl. Fr. 3: 161. 1805. Closely tufted, without 

 rootstocks: stems erect, 1-4 dm. high, distantly 1-3-leaved, tapering to a fili- 

 form summit: leaves 4-6 mm. wide, often involute, tapering to a sharp apex: 

 inflorescence a nodding spike-like often interrupted panicle, commonly 15-30 

 mm. long, usually exceeded by the lowest leaf -like bract, ovate-lanceolate, 

 acuminate, equaling the perianth: segments of the perianth brown with 

 hyaline margins, 2-3 mm. long, lanceolate, aristate-acuminate : capsule broadly 

 ovoid, about two thirds as long as the perianth. In the high mountains of our 

 range, and across the continent northward. 



3. Luzula intermedia (Thuill.) A. Nels. Stems slender, 1-4 dm. high, 

 leafy: leaves 6-10 cm. long, 2-6 mm. wide; the foliaceous bract usually ex- 

 ceeding the narrow panicle: peduncles 2-12, unequal, the longer 3-5 cm. long: 

 spikes simple, usually oblong, loosely-flowered: perianth pale or somewhat 

 tinged with brown, about 3 mm. long; its segments narrowly acuminate, 

 equaling the obtuse capsule: anthers small, as long as the filaments: seed 

 dark brown with a white caruncle. L. comosa. [Juncus intermedium Thuill. Fl. 

 Env. Paris, Ed. 2. 178. 1799; Juncoides intermedium (Thuill.) Rydb. Bull. 

 Torr. Bot. Club 32: 610. 1905]. From the Rocky Mountains to California 

 and Alaska. 



2. JUNCUS L. RUSH. Boa RUSH 



Chiefly perennials, and in wet soil or water, with pithy or hollow and simple 

 (rarely branching) stems, and panicled or clustered small (greenish or brown- 

 ish) flowers, chiefly in summer. Plant never hairy. Capsule many-seeded, 

 3-celled, or 1 -celled by the placentae not reaching the axis. Stamens when 3 

 opposite the 3 outer sepals. 



Leaves knotted by internal cross-partitions; panicles terminal. 

 Leaves compressed and equitant. 



Stamens 3 . . . . . . . . 1. J. ensifolius. 



Stamens 6. 



Heads two or more . . . . . . . 2. J. saximontanus. 



Heads solitary . . . . . . 3. J. Mertensianus. 



Leaves terete or only slightly compressed. 

 Stamens 6; seeds pointed. 



Perianth-segments and capsule obtuse . '. . 4. J. Richardsonianus. 



Perianth-segments and capsule acute or acuminate. 



Inner segments longer than the outer . . . 5. J. nodosus. 



Outer segments longer than the inner. 



Heads pale 6. J. Torreyi. 



Heads dark brown . . . . . 7. J. nevadensis. 



Stamens 3; seeds caudate 8. J. Tweedyi. 



Leaves not knotted, the cross-partitions at least not externally 



evident, flat, terete or semiterete. 

 Panicle terminal. 

 Flowers capitate. 

 Leaves fistulous. 



Leaves flattened upward . . . . . 9. J. triglumis. 



Leaves terete, channeled at base . . . , . 10. J. castaneus. 



Leaves flat, not fistulous. 

 Stamens 6. 



Perianth-segments smooth 11. J. longietylis. 



Perianth-segments rough . . . . . . 12. J. orthophyllus. 



Stamens 3 . . . . . . . 13. J. marginatus. 



Flowers solitary, in panicles. 

 Stems simple, naked. 



Leaf-blade terete 14. J. Vaseyi. 



Leaf-blade flat. 



Perianth-segments pale ...... 15. J. tenuis. 



Perianth-segments brown with green midrib . . 16. J. confusus. 



