3(1). Seeds usually erect or with some horizontal in the terminal and subterminal 

 glomerules, the fruit laterally flattened; leaves rather fleshy, green- 

 ish on both surfaces; flowers in axillary glomerate clusters and in 

 terminal sometimes branched spikes 3. C. chenopodioides. 



3. Seeds mostly but not always horizontal, sometimes at least some vertical, the 



fruit flattened on top; leaves not especially fleshy, usually farinose 

 (at least on lower surface); flowers more diffusely borne, not all in 

 axillary glomerules or axillary and terminal spikes (4) 



4(3). Plant prostrate or low with spreading-ascending stem and branches; leaves 

 lanceolate to ovate-oblong, green above, grayish-farinose beneath, 

 sinuate-dentate; at least some of the fruits with the seed vertical 

 4. C glaucum. 



4. Plant typically erect; leaves various; seeds all horizontal (5) 



5(4). Leaf blades entire to once or twice hastately lobed at base, the margin 



mostly not toothed; pericarp not tightly adherent to the seed 



5. C. Fremontii. 



5. Leaf blades usually toothed on the margin as well as frequently hastately 



lobed, the teeth sometimes inconspicuous; pericarp generally very 

 tightly adherent to the seed 6. C. album. 



1. Chenopodium ambrosioides L. Mexican tea, wormseed, epazote. 



Annual or perennial herb, glabrous or glandular, ill-scented; stems erect or 

 ascending, 3-10 dm. tall; branches stout, simple or paniculately branched, 

 glabrous or puberulent below, usually glandular-villous or tomentulose about the 

 inflorescence but occasionally glabrous; leaves oblong to ovate or lanceolate, 2-12 

 cm. long, 15-55 mm. broad, sinuate-dentate or sinuate-pinnatifid, the lobes acute 

 or obtuse, copiously gland-dotted or the glands absent, puberulent to short-villous 

 or glabrous; flowers solitary or usually glomerate in dense or interrupted slender 

 or stout elongate spikes, these naked or leafy (the blades much smaller than 

 the lower ones, lanceolate to oblanceolate or spatulate to linear, obtuse to acute 

 or attenuate); perianth about 1 mm. high, glabrous or short-villous, usually 

 gland-dotted, the lobes rounded-ovate and obtuse, completely enclosing the fruit; 

 stamens exserted; pericarp very thin and deciduous; seed horizontal or vertical, 

 0.6-0.8 mm. broad, nearly black, the margin obtuse. Incl. var. anthelminticum 

 (L.) Gray. 



Waste places, cult, grounds and shores, salt marshes, in floodplains of alkaline 

 and salt regions, and along interior streams, a weedy and medicinal herb, rare 

 in Tex., Okla. {Waterfall) and Ariz. (Cochise, Maricopa, Pinal and Yuma cos.); 

 Ont. and Me., s. to Fla., Tex. and Calif.; summer-fall; Berm.; naturalized in 

 Eur., Asia and Afr.; nat. of trop. Am., W.I. and Mex. and C.A. to S.A. 



2. Chenopodium Botrys L. Jerusalem oak, feather-geranium. 



Annual herb, with a strong but not unpleasant aromatic scent; stems erect, 

 2-6 dm. tall, densely glandular-viscid throughout, much-branched, the branches 

 ascending; leaves oblong or oval, 1-5 cm. long, sinuate-pinnatifid, entire or 

 sinuately lobed, the lobes obtuse or rounded, truncate to cuneate at the base, 

 petioles half as long as or shorter than the blades, the blades of leaves in the 

 inflorescence reduced and often entire; inflorescence of numerous densely many- 

 flowered cymes, the whole finally forming a narrow elongate nearly naked panicle; 

 flowers subsessile, 1 mm. long; perianth cleft nearly to the base, the lobes oval 

 or oblong and acute or acuminate, densely glandular-pubescent, imperfectly en- 

 closing the fruit at maturity; pericarp thin, whitish, firmly attached to the seed; 

 seed subglobose, 0.6 mm. in diameter, dark-brown, dull, vertical or horizontal. 



In waste places, ditches, low wettish places, cinder dumps and railroad beds, 

 uncommon in Tex., N.M. (San Juan and Santa Fe cos.) and Ariz. (Maricopa 



854 



