FLOWERING PLANTS AND FERNS OF ARIZONA 181 



17. Capsule oblong or ovoid to obovoid; stamens 3 or 6 (19). 



19. Perianth greenish or straw-colored; rhizomes very .-hort or obsolete; 

 stamens 3: capsule ovate-lanceolate in outline. 



18. J. ACUMIXATUS. 



19. Perianth chestnut-colored or dark brown; rhizomes well developed; 

 stamens 6 (rarely only 3 in ./. mertensianus) ; capsule oblong, ovate, 

 or obovate in outline (20). 

 20. Anthers shorter than the filaments: heads usually solitary; styles 

 included: capsule obovoid, obtuse: plant alpine. 



19. J. MERTEXSIAXUS. 



20. Anthers much longer than the filaments; heads usually 2 or more; 

 styles ex>erted: capsule oblong to ovoid, acutish. 



20. J. BADIUS. 

 16. Leaf blades ensiform, the septa incomplete (21). 



21. Stamens 3; bract eiisiform, more than half the length of the inflores- 

 cence 21. J. EXSIFOLIUS. 



21. Stamens 6; bract narrower, less than half the length of the inflores- 

 cence (22). 

 22. Perianth segments equal in length, very narrow and thin, often 

 shorter than the oblong, acute capsule, spreading, overlapping 

 only near base, thus exposing about three-fourths of the capsule; 

 blades of the larger leaves 7 to 12 mm. wide; stems .-tout. 



22. J. XIPHIOIDES. 



22. Perianth segments unequal, the inner one- shorter, the segments 

 broader, firmer in texture, usually exceeding the oblong-obovoid 

 capsule, appressed, overlapping most of their length, thus ex- 

 posing little of the capsule: valves of the capsule more rigid than 

 in the preceding species; blades of the larger leaves seldom more 

 than 5 mm. wide: stems relatively slender (23). 



23. Seeds tailed: styles long-exserted 23. J. tracyi. 



23. Seeds not tailed; styles little if at all exserted. 



24. J. SAXIMOXTAXUS. 



1. Juncus drummondii E. Mey. in Ledeb., Fl. Ross. 4: 235. 1853. 

 Represented from the State by a single collection only, above timber 



line on the San Francisco Peaks, Coconino County, 1 1 .500 feet {Little 

 4758). Alaska to California, northern Arizona, and New Mexico; 

 Europe and Asia. 



2. Juncus effusus L., Sp. PL 326. 1753. 



The typical form of this European species is not known from 

 America. In Arizona it is represented by the following 2 varieties, 

 each known in the State from a single collection only. The var. 

 brunneus Engelm. is characterized by a very dark-brown perianth 

 which is firm to almost rigid in texture, appressed to, and from slightly 

 shorter than to slightly exceeding the capsule, its segments with 

 narrow scarious margins which are scarcely if at all involute. In var. 

 exiguus Fern, and Wieg. the pale-brown perianth is thin iit texture, 

 spreading, about 1% times the length of the capsule, with the broadly 

 scarious-margined segments becoming more or less involute. The var. 

 brunneus has been collected in the Rincon Mountains. Pima County. 

 7,500 feet (NeaUey 158), and ranges from British Columbia to Cali- 

 fornia and southern Arizona. The var. exiguus was collected on Pinal 

 Peak, Gila County, 7.700 feet (Smith 14000), and is limited to Cali- 

 fornia and central Arizona. 



3. Juncus balticus Willd., Mag. Gesell. Naturf. Freund. Berlin. 3: 



298. 1809. 

 A European and Asiatic species represented in Arizona by var. 

 montanus Engelm. Common throughout the State in moist habitats, 



3,600 to 9,500 feet, July to September. Kansas to Alaska, Arizona. 

 and California. 



