Chenopodium.| CVIt, CHENOPODIACER (BAKER AND CLARKE), 77 
1, CHENOPODIUM, Linn.; Benth, et Hook. f. Gen. PI. iti. 51. 
Flowers very small, mostly 2-sexual. Perianth of 5 lobes united 
below; lobes triangular or oblong, persistent, herbaceous in fruit. 
Stamens 5 or fewer; filaments short. Ovary superior, sessile, ovoid, 
smooth or often scabrid or glandular in the upper part; styles or 
stigmas 2 (or in C. ambrosioides 3), linear; ovule 1, usually oblique on 
a short basal stalk. Fruit a membranous utricle surrounded by or 
enclosed in the perianth. Seed globose, compressed, usually horizontal, 
brown or black, nearly or quite smooth; embryo annular, surround- 
ing or partly surrounding the albumen.—Herbs., Stems not trans- 
versely marked nor as though jointed. Leaves alternate, petioled ; 
blade flat, often toothed or pinnatifid. Flowers numerous; cymes 
axillary and running into copious terminal panicles, leafy or more often 
nearly leafless ; bracts (to the flowers) none. 
Species 50; mostly weeds, spreading throughout the world, abounding in tem- 
perate regions. 
*Ultimate branches of inflorescence straight, often 
1-2 in. long, with the flower-clusters sessile on 
them, without stalked glands. Perianth-seg- 
ments mealy, without hairs or stalked glands. 
Embryo forming one complete circle round the 
albumen, 
Styles 2. 
Leaves subentire, or obscurely lobed, or re- 
motely toothed. 
Leaves ovate, base obversely triangular . - 1. C. album. 
Leaves subquadrate, base very obtuse. . 2, C. opulifolium. 
Leaves with many teeth, sometimes twice 
serrate . . : ‘ : - 3. C. murale. 
Styles 3. Leaves oblong ‘ ° . 4, C. ambrosioides. 
**Ultimate branches of inflorescence short, dicho- 
tomous, slender, divaricate and often zigzag, 
papillose or glandular. Perianth-segments with 
stalked glands and no meal. Embryo forming 
about % of a circle round the albumen. 
Leaves broad in outline, deeply pinnatifid. 
Perianth-segments oblong, not keeled upwards . 5. C. Botrys. — 
Perianth-segments triangular, keeled . ° . 6. C. schraderianum. 
Leaves oblong, shallowly toothed . . . - 7. C. suberifolium. 
1. C. album, Linn. Sp. Pl, ed. i. 219, and ed. ii. 319. Suberect, 
1-3 ft. high. Leaves more or less mealy ; blade often 1-14 by 4-4 in., 
ovate or elliptic, subentire, obscurely lobed, or remotely toothed ; 
petioles of most shorter than the blade. Panicles axillary, running into 
a large terminal nearly leafless inflorescence; ultimate branches nearly 
Straight, linear, not papillose-scabrid. Perianth-segments ovate- 
triangular, mealy, thickened (hardly keeled) on the back, tips in fruit 
folded over the horizontal seed. Ovary glandular in the upper part; 
Styles 2. Nut dark brown, minutely puberulous, flat; the embryo 
