. Fiori di campo. La botanica. PERSICARIA tribù 249. Polygonum Convolvulus (arrampicata Persicaria) 3. P. convolvulus (arrampicata Persicaria). - Stelo twining ; foglie, cuore - freccia - ; a forma di segmenti di cade schiettamente keeled ; frutto di forma triangolare, roughish. Un mis- chievous erbaccia, con l'abitudine del campo Convolvuhis, twining round tlie steli di mais e altre piante, e li del cuscinetto verso il basso dal suo peso. I fiori di colore verdastro ad arco - bianco e crescere in allentato cluster ascellare circa 4 insieme. Culti- vated terreno ; abbondanti. - Fl, luglio e agosto. Annuale. 4. P. dumetorum (Copse Buck-frumento). -Disti

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. Flowers of the field. Botany. PERSICARIA TRIBE 249. Polygonum Convolvulus (Climbing Persicaria) 3. P. convolvulus (Climbing Persicaria). — Stem twining ; leaves, heart - arrow - shaped ; segments of the perianth bluntly keeled ; fruit triangular, roughish. A mis- chievous weed, with the habit of the Field Convolvuhis, twining round tlie stems of corn and other plants, and bearing them down by its weight. The flowers arc greenish - white, and grow in loose axillary clusters about 4 together. Culti- vated ground ; abundant. — Fl, July, August. Annual. 4. P. dumetorum (Copse Buck-wheat). —Distinguished from the last by its more luxuriant growth, its winged perianth, and shining fruit. By some botanists classed as a variety of the last. It grows in bushy places in the south of England. —Fl. August, September. Annual. 5. P. viviparimi (Viviparous Bistort).—Stem simple, erect, bearing a single, loose spike, which has in tlie lower part small bulbs in place of flowers ; perfect flowers with 3 styles, and producing tri- angular frxdts ; leaves very narrow, their margins rolled back. A slender plant, 6-8 inches high, remarkable for its tendency to propagate itself by small, red bulbs, which supply the place of flowers in the lower part of the spike; the flowers are light flesh- coloured. Mountain pastures in the highlands of Scotland, and the north of England.—Fl. June, July. Perennial, 6. P. bistorta (Bistort Snake-root).— A rather handsome plant, with a large twisted root, and several simple, erect stems, 12-18 inches high, each of which bears a cylindrical spike of flesh-coloured flowers ; leaves egg-shaped, the radicle ones on long stalks, and sometimes as much as 6 inches long. Moist meadows, chiefly in the north ; not common.—Fl. June. Perennial. 7. P. amphibium (Amphibious Persicaria).—Stem erect, or sup- ported in the water by the floating leaves ; flowers in oblong spikes ; stamens 5 ; styles 2 ; fruit flattened ; leaves oblong, heart-shaped at t

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• booksubjectbotany
• bookyear1908