GOOSEFOOT FAMILY. 575 
14. Chenopodium ambrosioides L. Mexican Tea. (Fig. 1372.) 
Chenopodium ambrosioides I,. Sp. Pl. 219. 1753- 
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 toa short peti- 
ole, repand-dentate, undulate or the upper en- 
tire, 1/-3%4’ 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- 
Yalized from tropical America. Introduced as a 
weed also intosouthern Europe and Asia. Aug.— 
Oct. 
15. Chenopodium anthelminticum I. Wormseed. (Fig. 1373.) 
Chenopodium anthelminticum L,. Sp. Pl. 220. 1753. 
Chenopodium ambrosiotdes var. anthelminticum 
A. Gray, Man. Ed. 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%°-314° long. Leaves lanceolate or 
ovate-lanceolate, usually acuminate at the apex 
and narrowed at the base, slender-petioled, 
coarsely dentate or incised, 2/-5’ long, the 
lower I’ or more wide, the upper gradually 
smaller, the uppermost commonly linear-lanceo- 
late and entire; flowers in linear usually bract- 
less panicled spikes, or the lower spikes leafy- 
bracted; seed horizontal or vertical; embryo an 
incomplete ring. 
In waste places, southern New York and .outhern 
Ontario to Wisconsin, south to Florida and Mexico. 
Naturalized from Europe. Aug.—Oct. 
2. ROUBIEVA Mog. Ann. Sci. Nat. (II.) 1: 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 5s. 
Styles 3, exserted. Wall of the pericarp thin, glandular. Seed vertical. Embryo a com- 
plete ring in the mealy endosperm. [Name in honor of G. J. Roubieu, French botanist. ] 
A monotypic genus of South America, often included in Chenopodium. 
37 
