82 CHENOPODIACEAE 



11. Atriplex expansa var. mohavensis M. E. Jones. Mojave Silver-scale or 



Fogweed. Fig. 1511. 



Atriplex trinervata Jepson, Pittonia 2: 305. 1892. 



Atriplex expansa var. mohavensis M. E. Jones, Contr. West. Bot. no. 11: 20. 1903. 



Atriplex mohavensis Standley, N. Amer. Fl. 21: 47. 1916. 



Atriplex sordida Standley, N. Amer. Fl. 21: 47. 1916. 



Annual, with erect or spreading much branched stems, 2-5 dm. high, the branches obtusely 

 angled, furfuraceous. Leaves broadly deltoid to broadly ovate, 1-7 cm. long, the lower short - 

 petioled, upper sessile, truncate or subcordate or the uppermost smaller and clasping, entire or 

 somewhat sinuate-dentate, thin, more or less furfuraceous, becoming glabrate; staminate flowers 

 mostly in terminal spikes, the pistillate in axillary clusters; fruiting bracts sessile, cuneate- 

 orbicular, 3-5 mm. long, compressed, united to above the middle, the margins free and green, 

 acutely dentate, the sides usually smooth, rarely tuberculate or cristate. 



Alkaline soils, Upper and Lower Sonoran Zones; Sacramento Valley to southern California and western 

 Arizona. The typical species is in western Texas and New Mexico, the two merging in Arizona. July-Nov. 



12. Atriplex Serenana A. Nels. Bracted Saltbush or Bract-scale. Fig. 1512. 



Obione bracteosa Dur. & Hilg. Pacif. R. Rep. 5: 13. 1858. 



Atriplex bracteosa S. Wats. Proc. Amer. Acad. 9: 115. 1874. Not Trautv. 1870. 



Atriplex Serenana A. Nels. Proc. Biol. Soc. Wash. 17: 99. 1904. 



Annual, with erect or decumbent usually much branched stems, 3-10 dm. high, the branches 

 obtusely angled, furfuraceous when young. Leaves numerous, sessile or subsessile, grayish green 

 and sparsely mealy, oblong or oval, 2-8 cm. long, cuneate at the base, dentate or the upper usually 

 entire ; flowers monoecious, the staminate in terminal spikes, the pistillate in small axillary clus- 

 ters ; fruiting bracts short-pedicelled, broadly cuneate, 2-2.5 mm. long, compressed, united below, 

 rounded and acutely toothed at apex, the sides rarely obscurely tuberculate. 



Saline soils, Sonoran Zones; Sacramento Valley to northern Lower California and western Nevada. Type 

 locality: Poso Creek, Kern County, California. April-Oct. 



13. Atriplex Davidsonii Standley. Davidson's Saltbush. Fig. 1513. 



Atriplex Davidsonii Standley, N. Amer. Fl. 21: 57. 1916. 



Annual with prostrate much branched stems, the branches slender, terete, stramineous, 1-4 dm. 

 long. Leaves numerous, sessile or subsessile, 7-14 mm. long, oblong to lanceolate-oblong, acute 

 or acuminate at the apex, obtuse or cuneate at base, repand-denticulate or dentate or the upper- 

 most entire, finely furfuraceous, staminate flowers in short naked terminal spikes or in axillary 

 glomerules, pistillate in few-flowered axillary clusters ; fruiting bracts sessile, suborbicular, 3 mm. 

 long, compressed, united to the middle, acutely dentate, the terminal tooth usually longest, sides 

 smooth or usually with 2 tubercles. 



Alkaline soils, Upper Sonoran Zone; near the coast, southern California. Type locality: Balboa, Orange 

 County, California. May-Oct. 



14. Atriplex pacifica A. Nels. Pacific Saltbush. Fig. 1514. 



Obione microcarpa Benth. Bot. Sulph. 48. 1844. 



Atriplex microcarpa D. Dietr. Syn. PI. 5: 536. 1852. Not Waldst. & Kit. 1812. 



Atriplex pacifica A. Nels. Proc. Biol. Soc. Wash. 17: 99. 1904. 



Annual, with prostrate much branched stems, 1-4 dm. long, the branches slender, obtusely 

 angled, furfuraceous when young. Leaves numerous, sessile or the lower short-petioled, 6-14 

 mm. long, oblong to obovate-oblong or oval, acute or obtuse at apex, cuneate at base, densely 

 furfuraceous ; staminate flowers in the upper axils, usually in large glomerules, the pistillate in 

 small clusters in the lower axils, fruiting bracts sessile, obovate to suborbicular, 1-1.5 mm. long, 

 united to the middle, minutely 3-5-toothed at apex, the sides smooth or rarely obscurely tubercu- 

 late. 



Saline soils near the coast, Sonoran Zones; Los Angeles County, California, to Lower California, and on the 

 adjacent islands. Type locality: San Diego, California. March-Oct. 



15. Atriplex Coulteri (Moq.) D. Dietr. Coulter's Saltbush. Fig. 1515. 



Obione Cmdteri Moq. in DC. Prod. 13 2 : 113. 1849. 

 Atriplex Coulteri D. Dietr. Syn. PI. 5: 537. 1852. 



Perennial or flowering as an annual, often woody at base, much branched, the branches 1-10 

 dm. long, terete, furfuraceous at least when young, often glabrate and reddish in age. Leaves 

 numerous, sessile or short-petioled, 7-15 mm. long, obovate to oblanceolate or elliptic, obtuse to 

 acuminate at apex, cuneate at base, entire, thin, loosely furfuraceous ; staminate flowers in the 

 upper axils or in short naked spikes, pistillate in small axillary clusters ; fruiting bracts sessile, 

 2-3 mm. long, obovate, obtuse at apex, united to the middle, the free margins sharply dentate, the 

 sides with a few pointed tubercles or smooth. 



Saline soils near the coast, Sonoran Zones; southern California to Lower California and on the adjacent 

 islands. Type locality: California. March-Oct. 



