246 CHENOPODIACEAE 



Bracts nearly free; shrub spinescent. 19. A. Torreyi. 



Bracts larger, 510 mm. long, not veined. 



Leaves reniform, coarsely sinuately dentate; free portion of the bracts 



reniform. 20. A. hymenolytra. 



Leaves entire; bracts not reniform. 



Leaves broadly oval or obovate; bracts obovate or suborbicular. 

 Bracts entire. 21. A. conferti folia. 



Bracts dentate or denticulate, at least near the base. 



22. A. collina. 



Leaves oblanceolate ; bracts lance-oblong. 23. A. subconferta. 

 Bracts with a distinctly toothed margin or appendaged on the back. 

 Bracts broadest above the middle. 



Bracts more or less toothed on the margin, only rarely tuberculate on 



the back. 



Bracts 3-toothed at the apex, the middle tooth the longest. 

 Bracts oblong-cuneate ; leaves oblanceolate-cuneate. 



24. A. Gardneri. 

 Bracts broadly obovate-cuneate ; leaves linear. 



25. A. tridentata. 

 Bracts several-toothed at the apex. 26. A. pabularis. 



Bracts entire, spongy, strongly tuberculed or appendaged on the back. 



27. A. corrugata. 



Bracts broadest below the middle, strongly tuberculate or appendaged. 

 Leaves oblanceolate to spatulate. 



Leaves oblanceolate, oblong, or narrowly spatulate, subsessile, or 



short-petioled. 



Plant low; staminate flowers brown, in panicles; leaves short- 

 petioled. 28. A. oblanceolata. 

 Plant usually tall; staminate flowers yellow, in interrupted 



spikes; leaves sessile. 

 Bracts ovate, sessile or nearly so ; leaf -blades oblanceolate to 



oblong. 29. A. Nuttallii. 



Bracts fusiform, stalked; leaf-blades oblong-linear to linear. 



30. A. falcata. 

 Leaves broadly spatulate, conspicuously petioled; staminate flowers 



brown, in interrupted spikes. 31. A. cuneata. 



Leaves oval, sessile. 32. A. buxifolia. 



Bracts broadly 4- winged. 



Leaves oval, abruptly acuminate. 33. A. Garrettii. 



Leaves from oblong or spatulate to linear, not acuminate. 



Wings thick, laciniate-toothed. 34. A. aptera. 



Wings thin, sinuately dentate or subentire. 



Wings when fully developed 4-6 mm. wide, distinctly dentate. 



Leaves comparatively broad, linear-oblong to spatulate, 4-10 mm. 

 wide; sinus at the apex of the fruit narrow; free portion of the bract 

 one-half to three-fourths as long as the width of the wing. 



35. A. canescens. 



Leaves very narrow, linear, 2-5 mm. wide; sinus of the strongly reticu- 

 late bract broad; free portion of the bract less than half as long as 

 the width of the wing. 36. A. tetraptera. 



Wing very broad and thin, fully 8 mm. wide, merely sinuate; leaves linear. 



37. A. occidentalis. 



1. A. hortensis L. Stem 1-1.5 m. high; leaves petioled; lower leaf -blades 

 from cordate or hastate to ovate, sinuately toothed, 1-2 dm. long, the upper 

 lanceolate and entire; bracts rounded-ovate, about 1 cm. in diameter, thin, 

 reticulate. Waste places: N.Y. Colo. Utah Mont.; escaped from cultiva- 

 tion; native of Eu. Plain Submont. Jl-Au. 



2. A. lapathifolia Rydb. Stem strict, 4-6 dm. high; leaves petioled; blades 

 somewhat fleshy, dark green, lanceolate, 3-6 cm. long, entire; bracts in fruit 

 about 4 mm. long and 5 mm. wide, often slightly hastate, sometimes with 1 or 

 2 tubercles on the back, thin, veiny, acute. Alkaline flats: Mont. Wyo. 

 Neb. Plain. Au-S. 



3. A. hastata L. Stem branched, 5-10 dm. high, subglabrous; leaf -blades 

 fleshy, rarely sinuately-toothed, 3-7 cm. long; flowers numerous, in large fleshy 

 clusters forming interrupted spikes; fruiting bracts triangular-ovate, about 5 mm. 

 long and broad, usually with 1 or 2 small teeth on each margin, and sometimes 

 with 1 or 2 fleshy tubercles on the back. A. carnosa A. Nels. A. subspicata 

 Rydb., a low spreading form. Alkaline meadows or flats: Alta. Kans. N.M. 

 Nev. Ida. Plain Son. Au-S. 



4. A. phyllostegia (Torr.) S. Wats. Stem stout, 2-6 dm. high, simple or 

 branched; leaves thin, rhombic-triangular, hastate, or ovate, 2-5 cm. long, 

 entire; flower-clusters axillary and in short naked spikes at the ends; bracts 



