48 NORTH AMERICAN FLORA [VoL.umE 21 
flowers monoecious, the pistillate solitary or in small glomerules in the axils, usually mixed 
with the staminate ones, the staminate glomerules 3-3.5 mm. in diameter, axillary and also 
forming slender interrupted simple terminal spikes, these sometimes 8 cm. long; fruiting 
bracts short-pedicellate or subsessile, flabelliform, united nearly to the middle, the free portion 
green, deeply and coarsely dentate, the sides smooth or sparsely muricate; radicle superior. 
Type collected along the road between Moab and Monticello, Utah, July 22, 1911, P. A. Ryd- 
berg & A. O. Garrett 9110 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Dry mesas, vicinity of the type locality. 
25. Atriplex Caput-Medusae Eastw. Proc. Calif. Acad. II. 6: 316. 
1896. 
Erect annual, 1-5 dm. high, much branched, the branches ascending, stout, obtusely 
angled, densely furfuraceous, or glabrate and stramineous in age; lowest leaves opposite, the 
others alternate, the petioles half as long as the blades or shorter, the uppermost leaves very 
shortly petiolate; leaf-blades deltoid-ovate to deltoid-oblong, deltoid,’ or the lowest often 
suborbicular, 1-3 cm, long, rounded to acute at the apex and apiculate, truncate to broadly cune- 
ate at the base, entire or sinuate, rather thin, densely grayish-furfuraceous, the uppermost 
blades shorter and narrower than the lower ones; flowers monoecious, in few-flowered axillary 
glomerules; calyx 5-cleft, densely furfuraceous; fruiting bracts ovoid, 5-7 mm. long, on pedicels 
3-5 mm. long, united nearly to the apex, not compressed, indurate, the margins deeply lacini- 
ate, the sides densely covered with narrow flat acute herbaceous processes; seed about 1.5 mm. 
long, reddish-brown, the radicle superior. 
TypPE LocaLity: Near Recapture Creek, along the banks of the San Juan River, Utah. 
DISTRIBUTION: Dry alkaline soil, southwestern Colorado, southeastern Utah, northwestern 
New Mexico, and northeastern Arizona. 
ILLUSTRATION: Proc. Calif. Acad. II. 6: pl. 46. 
26. Atriplex Hillmani (M. E. Jones) Standley, sp. nov. 
Atriplex argentea Hillmani M. E. Jones, Contr. West. Bot. 11: 21. 1903. 
Erect or decumbent annual, 1-2 or rarely 3 dm. high, densely branched, the branches 
spreading or ascending, slender, obtusely angled; lowest leaves opposite, the others alternate, 
the petioles half as long as the blades or usually shorter, the uppermost blades very shortly 
petiolate; leaf-blades ovate-oval, oval-deltoid, oval, or broadly oblong, or the lowest rhombic- 
orbicular, 0.8-1.5 or rarely 3 cm. long, obtuse to acuminate at the apex, acute to subtruncate at 
the base, entire, rather thin, densely and finely grayish-furfuraceous; flowers monoecious, in 
‘small axillary glomerules; calyx 5-cleft, densely furfuraceous, broad, sometimes tinged with 
red; fruiting bracts sessile, ovoid or obovoid, about 4 mm. long, indurate, not compressed, 
the margins deeply and acutely dentate, the sides covered with numerous rather short, stout 
flat, acute appendages; seed about 1.5 mm. long, the radicle superior. 
Type LocaLIty: Reno, Nevada. 
DistRiBuTION: In dry soil, Nevada and southeastern Oregon. 
1X. Powellianae. Erect annuals, densely furfuraceous. Leaves alternate, petiolate, or 
the uppermost sessile, the blades broad, entire, conspicuously 3-nerved. Flowers monoecious, 
in axillary glomerules. Fruiting bracts sessile, panduriform, truncate at the apex, the sides 
coarsely cristate. Radicle superior. 
27. Atriplex Powellii S. Wats. Proc. Am. Acad. 9: 114. 1874. 
Atriplex philonitra A. Nelson, Bot. Gaz. 34: 358. 1902. 
Atriplex Nelsoni M. E. Jones, Contr. West. Bot. 11: 21. 1903. 
Erect annual, 1.2-6 dm. high, simple or branched at the base, much branched above, 
the branches slender or stout, obtusely angled, ascending, whitish-furfuraceous; leaves numer- 
ous, alternate, the petioles of the lower leaves nearly equaling the blades, the uppermost leaves 
sessile or subsessile; leaf-blades broadly rhombic-ovate to ovate, the lowest suborbicular, 1-4 
cm. long, obtuse or acute at the apex, obtuse, cuneate, or abruptly cuneate at the base, entire, 
rather thick, densely white-furfuraceous beneath, greener above, prominently 3-nerved; flowers 
