and Yavapai cos.); nat. of Eur., Asia and Afr.; adv. and naturalized as a weed 

 throughout U.S. and Can.; also S.A. 



3. Chenopodium chenopodioides (L.) Aellen. 



Annual herb; stems prostrate and low-branching or upright; leaves glabrous 

 or promptly glabrate beneath, rhombic or spatulate, shallowly sinuate or entire; 

 flowers terminal and lateral in glomerules, these either separate or forming 

 contracted spikes in the axils of leaves or bracts, or in small or large panicles, 

 the terminal flowers with horizontal seeds, the lateral flowers with vertical 

 seeds; perianth parts (with vertical seed) 3 or 4, united nearly to the tips, the 

 free tips minutely but definitely apiculate; stigmas chiefly 0.2-0.3 mm. long, 

 usually ascending as in a V. C. rubrum sensu N. A. auth.. C. humile sensu N. A. 

 auth. 



Saline habitats and salt marshes, Wash, to Calif., Nev., Wyo., Col. and Tex.; 

 also N. Y. 



4. Chenopodium glaucum L. 



Prostrate to erect eglandular annual with numerous branches 1-4 dm. long; 

 leaves pale-green on upper surface, grayish-farinose on lower surface, very 

 gradually reduced upward; blades lanceolate to ovate-oblong or ovate-deltoid, 

 1-3 (-5) cm. long, rather coarsely sinuate-dentate, narrowed gradually to stout 

 petioles much shorter than the blades; flowers sessile, glomerate in numerous 

 short bracteate or ebracteate axillary spikes and a terminal simple or somewhat 

 compound spike; perianth cleft nearly to the base into (3 to) 5 (or 7) oblong- 

 obovate rounded lobes about 1 mm. long; pericarp very thin, greenish, free from 

 the seed; seed varying from commonly horizontal to sometimes vertical in the 

 same cluster of flowers; fruit laterally or dorsally flattened, about 0.8 mm. broad. 



In marshes and along streams in saline and alkaline soils, in N. M. (Dona Ana, 

 San Juan and Socorro cos.) and Ariz. (Apache and Navajo cos.). June-Sept.; 

 nat. of Euras., Afr., Austral, and Greenl.; adv. from N.B. to Va., Neb., Tex., 

 N.M. and Ariz. 



5. Chenopodium Fremontii Wats. 



Annual herb; stems erect, 2-10 dm. tall, the branches slender, ascending, often 

 flexuous, sparingly white-mealy to light-green, glabrous; leaves broadly triangular 

 to rhombic, sinuate-dentate, 15-65 mm. long and nearly as broad, rounded and 

 mucronate at the apex, the base with prominent hastate lobes, the lobes oval to 

 rounded-obovate, the slender petiole about half as long as the blade; flowers in 

 clusters, these forming slender spikes or an open panicle; perianth usually sparsely 

 farinose, deeply cleft, strongly carinate, nearly covering the fruit; stigmas short; 

 pericarp free; seed horizontal, smooth or slightly rugulose, black, shining, fully 

 1 mm. broad, the margin obtuse. C Watsonii A. Nels. 



In marshes and mud about lakes, in seepage about springs and on banks of 

 streams, in n.w. Okla. (Alfalfa Co.), w. Tex., N.M. (widespread) and Ariz. 

 (Apache to Mohave, s. to Cochise, Pima and Santa Cruz cos.), Mar.-Sept.; Sask, 

 and B. C. to N.D., s. to n.w. Okla., w. Tex., N.M., Nev., Ariz, and n. Mex. 



Forma farinosum Aellen. Plants more bushy in form and smaller; leaves 

 smaller, thicker, more grayish-farinose, with the habit and seed characteristics 

 of typical C. Fremontii. Mainly in mt. areas, Ida. to Tex. 



Var. Pringlei (Standi.) Aellen. Very similar to typical C Fremontii except the 

 leaves are serrate. N.D. to Tex. and Mex. 



6. Chenopodium album L. Pigweed, lamb's-quarters, quelite. Fig. 424A. 



Annual herb, pale-green, sometimes turning reddish; stems erect, stout, 6-30 

 dm. tall, usually simple below the inflorescence, paniculate branched above, 



855 



