. Botany; an elementary text for schools. Plants. 2. RtTMEX. Dock. Sorrel. Perennial often deep-rooted plants with herbage bitter or sour: sepals 6, the 3 outer large and spreading, the 3 inner (kn»wn as "valves") enlarging after flowering and one or more of them often bearing a grain-like tubercle on the back: stamens 6,styles 3: flowers in pan- icles or interrupted spikes. a. Docks: herbage hitter: valves often grain- hearing: floivers mostly perfect: leaves not arroiv-shaped. R, obtusifdlius, Linn. Bitter dock. Lower leaves long-cordate and obtuse, not wavy: one valve usually grai
. Botany; an elementary text for schools. Plants. 2. RtTMEX. Dock. Sorrel. Perennial often deep-rooted plants with herbage bitter or sour: sepals 6, the 3 outer large and spreading, the 3 inner (kn»wn as "valves") enlarging after flowering and one or more of them often bearing a grain-like tubercle on the back: stamens 6,styles 3: flowers in pan- icles or interrupted spikes. a. Docks: herbage hitter: valves often grain- hearing: floivers mostly perfect: leaves not arroiv-shaped. R, obtusifdlius, Linn. Bitter dock. Lower leaves long-cordate and obtuse, not wavy: one valve usually grain-bearing. Weed from Europe. R. crispus, Linn. Curly dock. Leaves lanceo- late, wavy or curled: all valves usually grain-bear- 453. Rumex Acetosella. ing. Weed from Europe. aa. Sorrels: herbage sotir: valves not grain-bearing: flowers dioecious: leaves arrow-shaped. R. Acetos611a, Linn. Common or sheep sorrel. Fig. 453. Low (1 ft. or less): leaves mostly arrow-shaped at base: flow- ers brownish, small, in a terminal panicle. Common in sterile fields. Europe. 3. FAGOPtRUM. Buckwheat. Fast-growing annuals, with somewhat triangu- lar leaves, and fragrant flowers in flattish, panicle- like clusters: calyx of 5 parts: stamens 8: fruit a triangular akene. Old World. F. escul^ntum, Moench. Common hucktvheat. Fig. 454. Leaves triangular-arrow-shaped, long-peti- oled: flowers white, in a compound cluster: akene with regular angles. Flour is made from the grain. F. Tatdricum, Gaertn. India ivheat. Slen- derer, the leaves smaller and more arrow-shaped and short-petioled: flowers greenish or yellowish, in simple racemes: akene notched on the angles. Somewhat cultivated. 4. POL'tGONUM. Knotweed. Smartweed. Low weedy plants, or some exotic ones tall and cultivated, blooming in summer and fall, the small pinkish or greenish flowers mostly in racemes or spikes (in the Knotweeds in the leaf-axils): calyx usually 5-parted: stamens 4-9: stigmas 2 or 3: black akene lenticular or triangular. a. Kn
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