chenopodiace^e. (goosefoot family.) 363 



or less enveloping the depressed fruit. Stamens mostly 5 : filaments filiform. 

 Styles 2, rarely 3. Seed horizontal (sometimes vertical in Nos. 7 and 9), len- 

 ticular: embryo coiled partly or fully round the mealy albumen. — Weeds, 

 usually with a white mealiness, or glandular. Flowers sessile in small clusters 

 collected in spiked panicles. (Name from xh v > « goose., and novs, foot, in allu- 

 sion to the shape of the leaves.) — Our species are all annuals (except No. 9 ?), 

 flowering through the summer, growing around dwellings, in manured soil, 

 cultivated grounds, and waste places. 



§ 1. CHEXOPODIUM Proper. — Smooth or mealy, never pubescent or qlandular 

 nor sweet-scented : embryo a complete ring. 



* Leaves entin : herbage green, sometimes turning purplish, no mealiness : calyx- 



lobes not keeled nor icholly enclosing the fruit. 



1. C. polyspermum, L. Stems slender, ascending; leaves oblong or ovate- 

 oblong, obtuse or acutish, narrowed into a slender petiole. — A scarce garden- 

 weed, about Boston, C. J. Sprague. Woods, near Mercersburg and Reading, 

 Penn., Porter: the var. spicatuji (C. acutifolium, Smith). (Nat. from Eu.) 



# * Leaves strongly and Jim-ply toothed, green throughout (mealiness obscure or none), 

 on slender petioles: calyx-lobes slightly or hot at all keeled, not completely enclosing 

 the ripe, fruit (least enclosing in No. 2, most so in No. 4). 



2. C. hy" bridtjm, L. (Maple-leaved Goosefoot.) Bright green ; stem 

 widely much branched (2°-4°high); I, ana thin (2'-8 / long), somewhat trian- 

 gular and heart-shaped, taper-pointed, sinuate-angled, the angles extended into a 

 Jew large and pointed teeth ; racemes diffusely and loosely panicled, leafless; the 

 smooth calyx-lobes keeled ; seed sharp-edged, the thin pericarp adhering closely 

 to it. — Common. Heavy-scented, like Stramonium. (Nat. from Eu.) 



3. C. urbicum, L. Rather pale or dull green, with erect branches (l°-3° 

 nigh); leaves triangular, acute, coarsely many-toothed ; spikes erect, crotoded in a 

 long and narrow racemose panicle ; calyx-lobes not keeled; seed with rounded ■mar- 

 gins.— Var. rhombifolium, Moquin (C. rhombifolium, Muhl), is a form 

 with the leaves more or less wedge-shaped at the base, and with longer and 

 sharper teeth. — Not rare eastward. (Nat. from Eu.) 



4. C. jiurale, L. Ascending, loosely branched (l°-li° high); leaves 

 rhomboid-ovate, acute, coarsely and sharply unequally toothed, thin, bright green ; 

 spikes or racemes diverging and somewhat corymbed ; calyx-lobes scarcely keeled; 

 seed sharp-edged. — Boston, to Illinois : rare. (Adv. from Eu.) 



* * * Leaves toothed, repand-angled, or sometimes nearly entire, more or less white- 

 mealy, as well, as the flowers : calyx-lobes distinctly keeled, usually (but not always) 

 perfectly enclosing the fruit. 



5. C. opulif6lium, Schrad. Leaves nund-rhombic, spreading, long-petioled, 

 very obtuse, somewhat 3-lobed, toothed, tin; upper oblong-lanceolate ; racemes 

 panicled, rather loose ; seed with rather oh use margins. — Seen from U. S. by 

 Moquin : probably it has been confounded with the next ; perhaps justly. (Adv. 

 from Eu.) 



6. C. album, L. (Lamb's-Quarters. Pigweed.) Ascending ; haves ; 

 varying from rhombic-ovate to oblong-lanceolate, or the upper linear-lanceolate, acute, 



