248 CHENOPODIACEAE 



15. A. tenuissima A. Nels. Stem branched from the base, 2-3 dm. high; 

 branches slender, decumbent; flower-clusters small, axillary; fruiting bracts very 

 small, less than 2 mm. long, triangular-ovate, with thick appendages on the faces. 

 Arid ground: Utah. Submont. S. 



16. A. Greenei A. Nels. Stem 1.5-4 dm. high, much branched; branches 

 strongly ascending, finely f urf uraceous ; flowers in small axillary clusters; fruit- 

 ing bracts ovate-oblong or oblong, 2 mm. long, minutely tuberculate, 3-nerved. 

 Arid ground: Wyo. Submont. 



17. A. gracilliflora M. E. Jones. Annual (?) or perennial; stem diffusely 

 branched, 3-6 dm. long, round, sparingly mealy; leaves petioled; blades cordate- 

 ovate, 1-2 cm. long, entire, fleshy; pistillate flowers in small axillary clusters, 

 the staminate ones in terminal panicles; fruiting bracts orbicular, entire, about 1 

 cm. broad. Alkaline soil: Utah. Son. Jl. 



18. A. lentiformis (Torr.) S. Wats. Shrubby perennial; stems diffusely 

 branched, 6-35 dm. high; leaves short-petioled; blades ovate or oblong-rhombic, 

 1-3.5 cm. long, entire, cuneate at the base; flowers paniculate; fruiting bracts 

 orbicular, obscurely crenate, 4-5 mm. broad. Alkaline flats: Ariz. s Utah 

 Calif.; n Mex. L. Son. S-F, 



19. A. Torreyi S. Wats. Shrubby perennial; stem diffusely branched, 6-15 

 dm. high; leaves short-petioled; blades ovate or oblong-triangular, often sub- 

 hastate, 1-3 cm. long, bluish gray; flowers densely paniculate; fruiting bracts 

 orbicular or reniform, obscurely denticulate, 3-4 mm. broad. Desert valleys: 

 Nev. s Utah Ariz. Calif. L. Son. Jl-S. 



20. A. hymenolytra (Torr.) S. Wats. Shrubby perennial; stem 6-10 

 dm. high; leaves petioled; blades 2-3 cm. long; flowers usually in small panicles, 

 but also in axillary clusters; fruiting bracts reniform, entire, about 1 cm. broad. 

 Alkaline plains: N.M. Utah Calif. Son. D-Ap. 



21. A. confertifolia (Torr.) S. Wats. Shrubby dioecious perennial; stem 

 3-15 dm. high; branches terete, spinescent; leaf-blades ovate or obovate to or- 

 bicular, 0.5-2 cm. long, short-petioled; flowers in axillary clusters; fruiting bracts 

 broadly ovate or suborbicular, about 1 cm. broad. SHAD-SCALES. Alkaline 

 valleys and bluffs: N.D. N.M. Calif. Ore. Son. Plain Submont. My- 

 Au. 



22. A. collina Woot.& Standl. Shrubby dioecious perennial; stem 2-3 dm- 

 high, much branched; branches spinose; leaf -blades oval-oblong to obovate* 

 1-2.5 cm. long; flower in axillary clusters, forming densely leafy spikes; fruiting 

 bracts ovate-orbicular, 5-8 mm. long, acute or acutish. Dry hillsides: Colo. 

 N.M. Ariz. Utah. Son. 



23. A. subconferta Rydb. A low dioecious shrub, with ascending, rather 

 slender, spinescent branches; leaf -blades oblanceolate, acutish or obtuse, 1-2 

 cm. long, short-petioled, entire; flowers in axillary clusters; fruiting bracts lance- 

 oblong, usually acute, 5-8 mm. long, entire. Dry bench-lands: Ida. Submont. Jl. 



24. A. Gardner! (Moq.) Standl. Suffruticose perennial; sterns decumbent 

 at the base, 2-4 dm. high; leaves sessile or nearly so; blades 3-6 mm. wide, 1.5-3 

 cm. long; flowers in axillary capitate clusters or the staminate more paniculate 

 above; fruiting bracts 5-6 mm. long; faces smooth and reticulate; staminate 

 flowers brown. A. Gordoni Hook. A. fruticulosa and A. eremicola Osterh. 

 Alkaline flats or dry lake beds: Wyo. 'Colo. Plain. My-Jl. 



25. A. tridentata O. Kuntze. Suffruticose dioecious perennial; stem with 

 erect branches, 3-8 dm. high; leaves sessile, linear, 3-6 cm. long, 2-5 mm. wide, 

 entire; flowers in axillary clusters. Saline soil: Utah Wyo. Colo. Son. 



26. A. pabularis A. Nels. Suffruticose perennial; stem with erect branches > 

 2-5 dm. high; leaves sessile or nearly so; blades oblong to almost linear, 1-5 cm- 

 long; flowers in leafy panicles; fruiting bracts cuneate-obovate, usually 5-toothed 

 at the apex; faces smooth. Alkaline flats: Wyo. Jl-S. 



27. A. corrugata S. Wats. Suffruticose perennial; stem much branched, 

 2-3 dm. high; leaf-blades linear-oblanceolate to oblong, entire, 6-18 mm. long; 



