Parr 1, 1916] CHENOPODIACEAE 71 
100. Atriplex aptera A. Nelson, Bot. Gaz. 34: 356. 1902. 
Atriplex odontoptera Rydb. Bull. Torrey Club 31: 404. 1904. 
Perennial, 1-4 dm. high, suffirutescent and much branched at the base, the stems erect or 
decumbent, terete, furfuraceous, simple below, often branched above, the branches ascending; 
leaves subsessile, the blades narrowly oblong to oblanceolate-oblong, 1.5—4 cm. long, 4-8 mm. 
wide, rounded or obtuse at the apex, cuneate or attenuate at the base, firm, furfuraceous, en- 
tire; flowers dioecious, the pistillate in axillary glomerules or in nearly naked, dense, terminal 
spikes; fruiting bracts on short stout pedicels, 4-5 mm. long, united nearly to the apex, in- 
durate, 4-winged on the back, the wings thick, densely furfuraceous, deeply and irregularly 
dentate, or some of them sometimes subentire, the free portion of the bracts about equaling 
the wings, often 3-dentate, the body of the bracts sometimes tuberculate; seed reddish-brown, 
1.5+2 mm. long, the radicle superior. 
TYPE LOCALITY: Laramie, Wyoming. 
Distrriution: In alkaline flats, southern Alberta to northern Colorado, 
101. Atriplex canescens (Pursh) Nutt. Gen. 1: 197. 1818 
Calligonum canescens Pursh, Fl. Am. Sept. 370. 1814. 
Atriplex Berlandiervi Moq. Chenop. Enum. 65. 1840. — 
Obione canescens Moq. Chenop. Enum. 74. 1840. 
Obione tetyaptera Benth. Bot. Voy. Sulph. 48. 1844. 
Pterochiton occidentale Torr. in Frém. Rep. Calif. 318. 1845. 
Pterochiton canescens Nutt. Jour. Acad. Phila. II, 1: 184. 1847. 
Obione occidentalis Moq. in DC. Prodr. 13?: 112. 1849. 
Lophocarya spinosa, Nutt.; Moq. in DC. Prodr. 132: 112, assynonym. 1849, 
Pterocarya spinosa Nutt.; Mog. in DC. Prodr. 13?: 112, assynonym. 1849. 
Obione Berlandieri Moa. in DC. Prodr. 13?: 114. 1849. 
Airiplex occidentalis D. Dietr. Syn. Pl. 5: 537. 1852. 
Obione occidentalis angustifolia Torr. Bot. Mex. Bound. Surv. 184. 1859. 
Atriplex canescens angustifolia S. Wats. Proc. Am. Acad. 9: 121. 1874, 
Atriplex angustior Cockerell, Proc. Davenp. Acad. 9: 7. 1902. 
Atriplex tetrapiera Rydb. Bull. Torrey Club 39: 311. 1912. 
Atriplex canescens macilenta Jepson, Fl. Calif. 442. 1914. 
Erect shrub, 6-15 dm. high, much branched throughout, the branches ascending or some- 
times spreading, stout, terete, whitish-furfuraceous, the bark on the older branches exfoliating; 
leaves numerous, sessile or subsessile, alternate, the blades linear to spatulate or narrowly 
oblong, broadest above the middle, 1-5 cm. long, 1.5—-6 or rarely 10 mm. broad, flat or revo- 
lute, entire, rounded at the apex or the upper ones acute, narrowly cuneate to attenuate at the 
base, thick and firm, furfuraceous; flowers dioecious or rarely monoecious, the yellow staminate 
glomerules in slender or stout, dense or interrupted, simple or paniculate spikes, the pistillate 
flowers in few- or many-flowered axillary glomerules, or in dense, nearly naked spikes; calyx 
5-cleft, densely furfuraceous, sometimes tinged with red; fruiting bracts united nearly to the 
apex, on slender or stout pedicels 2-15 mm. long, these often recurved, the body of the bract 
ovoid or oval, 7-13 mm. long, indurate, bearing on each side 2 longitudinal wings, these 3~13 
mm. broad, 7-25 mum. long, usually much surpassing the triangular free portion of the bracts, 
rather thin, conspicuously veined, densely furfuraceous or glabrate and green, the margins 
undulate to sharply dentate, the teeth often with rigid subulate tips; seed 1.5-2 mm. long, the 
radicle superior. 
TypE Locality: In the plains of the Missouri River, near the Big-bend [South Dakota]. 
DISTRIBUTION: Plains and hillsides, South Dakota to Oregon, Lower California, and Zacatecas. 
ILLUSTRATIONS: Britt. & Brown, Ill. Fl. f. 1385; ed. 2. f. 1702; Jepson, FI. Calif. f. 85; Bull. U.S. 
Dep. Agr. Bot.27: p1.6, f.1; Clements, Rocky Mt. Fi. pl. 10, f. 1,2; Pammel, Man. Pois. Pl. f. 202, 
102. Atriplex linearis S. Wats. Proc. Am. Acad. 24: 72. 1889. 
Erect shrub, 3-25 dm. high, much branched, the branches slender, terete, spreading or 
ascending, densely white-furfuraceous, the older branches with dark-gray or black bark; 
leaves sessile, the blades linear, 1-5 cm. long, 1.5-2.5 mm. wide, revolute, obtuse, firm, densely 
white-furfuraceous; flowers dioecious, the staminate in small glomerules arranged in slender, 
interrupted or dense, simple or paniculate spikes, the pistillate in few-flowered axillary glom- 
erules or in dense naked terminal spikes; calyx 5-cleft, densely furfuraceous; fruiting bracts 
