. Key and flora : northern and central states . Botany. 72 KEY AND FLORA 6. P. dumetorum L. False Buckwheat. 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.* ni. FAGOPYRUM L. Smooth annual herbs, with more or less triangul
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. Key and flora : northern and central states . Botany. 72 KEY AND FLORA 6. P. dumetorum L. False Buckwheat. 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.* ni. 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, mucli longer than the persistent calyx (Fig. 14).. A B Fig. 14. Buckwheat (Fagopyrum esculentum) A, flower; B, section of flower; C, fruit. (All somewhat magnified.) (After Marchand) 1. F. esculentum Moench. Buckwheat. 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. CHENOPODIACE.a;. Goosefoot Family Herbs or shrubs. Leaves simple, alternate, without stipules. Flowers small, actinomorphic, either bisexual or more or less monoecious or dioecious. 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.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston : Ginn