168 CHENOPODIACEAE (GOOSEFOOT FAMILY) 



14. Atriplex Nuttallii Wats. Proc. Am. Acad. 9: 116. 1874. Perennial, 

 with more or less woody base, diffusely branched, 2-5 dm. high, greenish but 

 moderately appressed scurfy: leaves oblong-spatulate to narrowly oblancep- 

 late, entire: staminate flowers in dense leafless spikes; pistillate clustered in 

 the axils and in terminal spikes: fruiting bracts ovate, strongly convex, 

 united, with toothed margins and irregularly crested or tubercled sides. 

 (A. oblanceolata Rydb. 1. c.^403.) The "Great Plains;" on alkali free or 

 moderately saline soil. 



14a. Atriplex Nuttallii corrugata (Wats.) A. Nels. Lower and more closely 

 branched: leaves smaller and more crowded: fruiting bracts obovate and 

 smaller. (A. corrugata Wats. Bot. Gaz. 16: 345. 1891.) Arid plains ; Colorado. 



15. Atriplex pabularis A. Nels. Bull. Torr. Bot. Club 25: 203. 1898. Closely 

 appressed white-scurfy, the slender branches tufted on a lignescent base, mostly 

 erect, 2-5 dm. high, usually but slightly branched: leaves oblong to almost 

 linear, 2-5 cm. long: flowers panicled, densely clustered : fruiting bracts united, 

 oblong-cuneate, decidedly compressed, 4-5 mm. long, almost as broad at the 

 3-toothed summit, their sides not muricate. Moist strongly alkaline soil; 

 Wyoming and south into Colorado. 



15a. Atriplex pabularis eremicola (Osterh.) A. Nels. Base more shrubby, 

 more divaricately branched: fruiting bracts often broader and not rarely 

 with accessory teeth on the rounded summit. (A. eremicola Osterh. Bull. 

 Torr. Bot. Club 25: 284. 1898.) Same range as the species. 



9. GRAYIA H. & A. 



Slightly scurfy or mealy and often spiny undershrubs, with entire alternate 

 leaves, small flowers in axillary clusters or terminal spikes. Flowers dioecious ; 

 calyx mostly 4-parted. Fruiting bracts completely united, obcompressed, 

 orbicular-flattened, entire and wing-margined, the sides naked and somewhat 

 reticulate- veined. Radicle inferior. 



1. Grayia spinosa (Hook.) Moq. in DC. Prodr. 13 2 : 119. 1849. Erect, 

 diffusely branched, 3-8 dm. high, the branchlets frequently spinescent: 

 leaves rather fleshy, glabrous or at first with the young branches somewhat 

 mealy, oblanceolata, spatulate or obovate, 10-25 mm. long, obtuse or acute, 

 narrowed at base and sometimes petioled : staminate flowers in axillary clusters, 

 the pistillate mostly spicate: fruiting perianth 5-10 mm. in diameter, sessile, 

 smooth, emarginate, thin, white or pinkish, the seed usually central. G. 

 polygaloides H. & A. Alkaline soil; throughout our range and westward. 



2. Grayia Brandegei Gray, Proc. Am. Acad. 11: 101. 1876. Lower and 

 unarmed, more mealy: leaves linear-spatulate : fruiting bracts smaller, slightly 

 mealy, retuse at base, sometimes 3- winged, sessile: style short, included. 

 Southwest Colorado. 



10. SUCKLEYA Gray 



A nearly glabrous annual, with branching prostrate stems, and suborbicular 

 leaves on long petioles. Monoecious, the flowers in axillary clusters. Peri- 

 carp naked, subhastate, with crested margins and 2-toothed apex. 



1. Suckleya Suckleyana (Torr.) Rydb. Mem. N. Y. Bot. Gard. 1: 133. 1900. 

 Smooth, or somewhat scurfy; the stems prostrate or ascending, 2-3 dm. long: 

 leaves 12-25 mm. long, on somewhat longer slender petioles, acutely repand- 

 dentate: flowers in axillary clusters, the staminate above: calyx parted to 

 the base: fruiting bracts 5-6 mm. broad, flattened, surrounded by -a narrow 

 crenate-denticulate margin: seed large, filling the cavity. S. petiolaris Gray. 

 Throughout our range but rare. 



11. EUROTIA Adans. 



Low pubescent undershrubs with alternate entire leaves and monoecious 

 or dioecious flowers in small axillary and somewhat spicate clusters. Calyx 



