162 CHENOPODIACEAE (GOOSEFOOT FAMILY) 



than the leaves: calyx about 1 mm. broad, its segments obtuse, not keeled, 

 not fully covering the depressed sharp-edged utricle. Widely distributed as 

 an introduced weed, but undoubtedly indigenous in saline areas of our range. 



7. Chenopodium incanum (Wats.) Heller, Cat. N. A. PI. 45. 1898. Densely 

 mealy throughout, low and diffusely branched, 1-2 dm. high: leaves rather 

 thick, somewhat fleshy and white-farinose, ovate, sinuate or hastately lobed, 

 7-14 mm. long: flowers crowded in close contracted panicles: sepals carinate 

 and mealy, covering the seed which readily separates from the pericarp. 

 C. Fremontii incanum Wats. Proc. Am. Acad. 9: 94. 1874. Dry loose soil of 

 the plains. 



8. Chenopodium Fremontii Wats. King's Rep. 5: 287. 1871. Erect, 

 slender, more or less branched, 2-6 dm. high, light green but somewhat mealy, 

 the stem striate: leaves broadly triangular-hastate, 7-20 mm. long, truncate 

 or cuneate at base, narrower and reduced upward : the small flowers in slen- 

 der spikes of the open panicle: the strongly carinate sepals nearly inclosing 

 the easily separable seed. Frequent; in the Rocky Mountains and westward. 



9. Chenopodium aridum A. Nels. Bull. Torr. Bot. Club 31: 240. 1904. 

 Annual, sparingly mealy: stem erect, 3-4 dm. high, often branched, striate: 

 leaves moderately thick, dark green, only slightly mealy; petioles about 1 cm. 

 long; blades 1-3 cm. long, oblong to ovate-lanceolate, entire or rarely slightly 

 hastately toothed, obtuse: inflorescence dense, narrow; flowers small: seeds 

 less than 1 mm., usually 0.75 mm. in diameter: pericarp thin and easily sep- 

 arated from the seed. (C. WolfiiRydb. Bull. Torr. Bot. Club 30: 240. 1903.) 

 Colorado and Wyoming. 



10. Chenopodium succosum A. Nelson, Bot. Gaz. 34: 361. 1902. Stout, 

 erect, 5-8 dm. high, freely branched, with ascending straw-colored branches; 

 the whole plant fleshy and exceedingly succulent: leaves lanceolate to ob- 

 lanceolate or even linear, irregularly toothed, 2-5 cm. long, on petioles about 

 half as long, green on both sides and not noticeably mealy: flower-clusters 

 axillary, crowded-spicate, very numerous: calyx membranous; the sepals 

 usually 3, suborbicular: pericarp thin, rather loosely covering the dark brown 

 seed. Wet saline soil; southern Wyoming. 



11. Chenopodium leptophyllum (Moq.) Nutt. DC. Prod. 13 2 : 71. 1849. 

 Usually densely mealy, the leaves sometimes glabrate and green above; 

 stems slender, erect, striate, branched, 2-4 dm. high: leaves linear, entire, 

 1-3 cm. long, acute or mucronate, shortly petioled: the small flowers clustered 

 in dense or interrupted spikes: the carinate sepals scarcely covering the 1 mm. 

 broad seed. Wyoming to Utah and southward to Mexico. 



lla. Chenopodium leptophyllum oblongifolium Wats. Proc. Am. Acad. 

 9: 95. 1874. Densely mealy, lower, stouter, more widely branched: leaves 

 oblong, often slightly hastate: flowers in dense clusters in short close spikes. 

 Colorado and New Mexico. 



12. Chenopodium desiccatum A. Nels. Bot. Gaz. 34: 362. 1902. Densely 

 white-mealy throughout, freely branched, low and spreading, about 1 dm. 

 high (broader than high) : leaves from linear to oblong, mostly acute, 1-2 cm. 

 long: floriferous throughout; the small clusters in dense panicles which are 

 naked towards the apex: calyx thickened and inclosing the rather large 

 shining-black seed, which is easily separable from the pericarp. Southern 

 Wyoming and northern Colorado. 



13. Chenopodium subglabrum (Wats.) A. Nels. Bot. Gaz. 34: 362. 1902. 

 Glabrous, bright green, loosely and slenderly branched, the branches very 

 widely divaricate: leaves linear-acute, 2-4 cm. long: flowers single or in 2-3- 

 flowered clusters, scattered on the branches. C. leptophyllum subglabrum 

 Wats. Wyoming to Oklahoma. 



14. Chenopodium rubrum L. Sp. PI. 218. 1753. Stout, erect, branching: 

 leaves triangular-hastate to lanceolate, cuneate at base, sparingly sinuate- 

 dentate, the upper narrowly lanceolate and entire: flower-clusters densely 

 spicate upon the leafy branchlets: sepals 2-5, rather fleshy: stamens 1 or 2: 

 stigmas short: seed horizontal, shining, separating from the pericarp. In 

 saline soil; across the continent, especially northward. 



