72 KEY AND FLORA 
6. P. dumetorum L. Fatse Buckwueat. Perennial. Stems slen- 
der, twining, branched, 2-10 ft. long. Leaves ovate, taper-pointed, 
heart-shaped to halberd-shaped at the base, long-petioled. Stipules 
cylindrical, truncate. Flowers in axillary, more or less compound and 
leafy racemes. Calyx greenish-white, the outer lobes winged and form- 
ing a margin on the pedicel. Stamens 8. Stigmas 3. Akene 3-angled, 
black, smooth, and shining. Margins of fields and thickets.* 
Il. FAGOPYRUM L. 
Smooth annual herbs, with more or less triangular leaves; 
the sheathing stipules cylindrical or funnel-shaped. Flowers 
bisexual, white, greenish or tinged with rose color, in terminal 
or axillary, often panicled, racemes. Calyx petal-like (Fig. 14), 
5-parted. Stamens 8. Styles 3, with knobbed stigmas. Akene 
3-angled, much longer than the persistent calyx (Fig. 14). 
Fic. 14. Buckwheat (Fagopyrum esculentum) 
A, flower; B, section of flower; C, fruit. (All somewhat magnified.) 
(After Marchand) 
1. F. esculentum Mcench. Buckwueat. Annual, nearly smooth. 
Leaves halberd-shaped, 1-3 in. long. Flowers white or nearly so, with 
8 yellow nectar-bearing glands between the stamens. Old fields and 
thickets, escaped from cultivation. Introduced from Europe or west- 
ern Asia. 
26. CHENOPODIACEH. Goosrroor Faminy 
Herbs or shrubs. Leaves simple, alternate, without stipules. 
Flowers small, actinomorphic, either bisexual or more or less 
moncecious or diccious. Calyx free from the ovary. Corolla 
wanting. Stamens usually 5, opposite the sepals. Styles or 
stigmas generally 2. Fruit with 1 seed, usually inclosed in a 
small, bladdery sac, sometimes an akene. 
