GOOSEFOOT FAMILY. 575 



14. Chenopodium ambrosioides L. Mexican Tea. (Fig. 1372.) 



Chenopodium ambrosioides L. Sp. PI. 219. 17^. 



Annual, glabrous or slightly glandular-pu- 

 bescent, green, not mealy, strong-scented, 

 stem much branched, ascending or erect, 

 leafy, 2-3 high, angular and grooved! 

 Leaves oblong or oblong-lanceolate, obtuse or 

 subacute at the apex, narrowed to a short peti- 

 ole, repand-dentate, undulate or the upper en- 

 tire, i'-3X' long, the upper numerous and 

 much smaller; flowers in small dense axillary 

 spikes, mostly shorter than the subtending 

 leaves; calyx usually 3-parted, completely en- 

 closing the fruit; pericarp readily separable 

 from the seed; seed horizontal or vertical, 

 shining; embryo an incomplete ring. 



In waste places, Maine and Ontario to Florida, 

 west across the continent to California. Natu- 

 ralized from tropical America. Introduced as a 

 weed also into southern Europe and Asia. Aug - 

 Oct. 



15. Chenopodium anthelminticum L/. Wormseed. (Fig. 1373.) 



Chenopodium anthflmintiiinn 1.. Sp. PI. no. 1753. 



Chenopodium ambmsioides var. anthelnn 

 A. Gray, Man. Kd. 5, 408. 1867. 



Annual or sometimes perennial, rather dark 

 green, similar to the preceding species and per- 

 haps intergrading with it, stem somewhat 

 stouter, 2;/ z "-3# long. Leaves lanceolate or 

 ovate-lanceolate, usually acuminate at the apex 

 and narrowed at the base, slender-petioled, 

 coarsely dentate or incised, a'-s' long, the 

 lower i' or more wide, the upper gradually 

 smaller, the uppermost commonly linear-lanceo- 

 late and entire; flowers iu linear usually bract- 

 less panicled spikes, or the lower spikes leafv- 

 bracted; seed horizontal or vertical; embryo an 

 incomplete ring. 



In waste places, southern New York and southern 



Ontario to \Vi.--o m-in. smith to Horulaand >: 

 Naturalized from Kurope. Aug. -Oct. 



2. ROUBIEVA Moq. Ann. Sci. Nat. (II.) i: 292. 1834. 



A perennial herb, glandular-pubescent, strong-scented, prostrate, and diffusely branched, 

 with narrow small short-petioled deeply pinnatifid leaves. Flowers small, green, perfect, or 

 pistillate, solitary, or in small axillary clusters. Calyx urn-shaped, 3-5-toothed, narrowed 

 at the throat, in fruit becoming obovoid, strongly reticulated and closed. Stamens 5. 

 Styles 3, exserted. Wall of the pericarp thin, glandular. Seed vertical. Embryo a com- 

 plete ring in the mealy endosperm. [Name iu honor of G. J. Roubieu, French botanist.] 



A monotypic genus of South America, often included in Chenopodium. 



37 



