368 FLORA. 



Family i. CHENOPODIACEAE Dumort. 

 Goosefoot Family. 



Annual or perennial herbs, rarely shrubs, with angled striate or terete 

 stems. Leaves alternate or sometimes opposite, exstipulate, simple, en- 

 tire, toothed or lobed, mostly petioled (in Salicornia reduced to mere 

 ridges). Flowers small, green or greenish, regular or slightly irregular, 

 variously clustered, occasionally solitary in the axils. Petals none. 

 Calyx persistent, 2-5-lobed, 2-5-parted or rarely reduced to a single sepal, 

 wanting in the pistillate flowers of some genera. Stamens as many as 

 the lobes or divisions of the calyx, or fewer, and opposite them ; filaments 

 slender; anthers 2-celled, longitudinally dehiscent. Disk usually none. 

 Ovary i-celled; ovule solitary, amphitropous ; styles 1-3; stigmas capi- 

 tate, or 2-3-lobed or divided. Fruit a utricle, with a thin or coriaceous 

 pericarp. Seed vertical or horizontal ; endosperm mealy, fleshy or want- 

 ing. About 75 genera and 550 species, of wide geographical distribution. 



* Embryo annular or conduplicate, not spirally coiled ; endosperm copious (except in 



Salicornia). 

 Leafy herbs ; endosperm copious. 



Fruit enclosed by or not longer than the calyx or bractlets. 



Flowers perfect or some of them pistillate ; calyx herbaceous or fleshy. 

 Calyx 2-5-lobed or 2-5-parted ; stamens 1-5. 



Fruiting calyx wingless, its segments often keeled. 



Calyx herbaceous or but slightly fleshy m fruit ; flowers in panicled 



spikes. I. Chenopodium. 



Fruiting calyx dry, strongly reticulated ; leaves pinnatifid. 



2. Roubieva. 

 Calyx very fleshy and bright red in fruit ; flowers densely capitate. 



3. Blttum. 

 Fruiting calyx horizontally winged. 4. Cycloloma. 



Calyx of i sepal ; stamen i. 5. Monolepis. 



Flowers monoecious or dioecious : calyx of pistillate flowers none ; fruit enclosed 

 by 2 bractlets. 



Bractlets flat or convex, not silky. 6. Atriplex. 



Bractlets silky-pubescent, conduplicate. 7. Eurotia. 



Flowers perfect ; calyx membranous ; leaves filiform-linear. 



8. Kochia. 



Fruit much exserted beyond the calyx. 9. Corispermum, 



Leafless fleshy herbs with opposite branches ; endosperm none. 10. Salicornia. 



* * Embryo spirally coiled ; endosperm little or none. 



Shrub; flowers monoecious, not bracteolate. u. Sarcobatus. 



Herbs ; flowers perfect, bracteolate. 



Fruiting calyx wingless ; leaves fleshy, not spiny. 12. Dondia. 



Fruiting calyx bordered by a thin horizontal wing ; leaves very spiny. 



13. Sal so la. 



i. CHENOPODIUM L. 



Annual or perennial herbs, with alternate petioled leaves. Flowers small, 

 green, perfect, sessile, bractless, clustered. Calyx 2-5-parted or 2-5-lobed, em- 

 bracing or enclosing the utricle, its segments or lobes often keeled or ridged. 

 Stamens 1-5 ; filaments filiform or slender. Styles 2 or 3 ; seed horizontal or 

 vertical, sometimes in both positions in different flowers of the same species ; endo- 

 sperm mealy; embryo completely or incompletely annular. [Greek, goose-foot, 

 from the shape of the leaves.] About 60 species, mostly weeds, of wide geographic 

 distribution. Besides the following, some 5 others occur in the western parts of 

 N. Am. 



* Embryo a complete ring. 



Leaves white-mealy on the lower surface. 



Leaves or some of them sinuate-toothed or lobed. 

 Sepals strongly keeled in fruit. 



Pericarp firmly attached to the seed ; stem erect, tall. 



i. C. album. 



