. Un manuale di erbacce : con le descrizioni di tutti i più perniciosi e fastidioso piante negli Stati Uniti e in Canada, le loro abitudini di crescita e di distribuzione, con metodi di controllo . Le erbacce. 336 BORAGINACEAE (Famiglia borragine) stretta forma lanceolata, da due a quattro pollici di lunghezza, quelle inferiori conicità- ing emarginati piccioli, quelle superiori sessili. Racemi lungo, ascendente, molti a fiore, di solito in coppie; corolla blu, più di un quarto di pollice broad, cinque lobi propagazione; pedicels quasi come lungo come il fiore, riflessi nella frutta. Frese a circa un quarto di pollice lungo i quattro nutlets keeled, margine

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. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. 336 BORAGINACEAE (BORAGE FAMILY) narrow lance-shaped, two to four inches long, the lower ones taper- ing to margined petioles, the upper ones sessile. Racemes long, ascending, many-flowered, usually in pairs; corolla blue, more than a quarter-inch broad, the five lobes spreading; pedicels nearly as long as the flower, reflexed in fruit. Burs about a quarter- inch long, the four nutlets keeled, margined with a single row of flattened, awl-like, barbed prickles. Means of control the same as for Ldppula echinata.. Fig. 233.— Yellow Burweed (Amsinckia in- termedia). X J. YELLOW BURWEED Amsinckia intermedia, F. and M. Other English names: Yellow Tarweed, Fireweed, Yellow Forget-me-not. Native. Annual. Propagates by seeds. Time of bloom: May to July. Seed-time: June to August. Range: Pacific Coast. Habitat: Grain fields, meadows, pastures, and vineyards. An unpleasant, hairy weed, with sticky, bristly burs which make it a pest to Cali- fornia wool-growers. Stem erect, clothed with stiff white bristles, one to three feet high, with spreading branches. Leaves rather thick, lance-shaped to linear, en- tire, and thickly covered with fine, bristly hairs much shorter than those on the stem. Flowers in crowded, terminal, leafy-bracted racemes which lengthen as the succession of bloom approaches the summit; when developed, the racemes may be five to ten inches long, peduncled, and have usually matured seeds at the base before the latest buds are unfolded. Co- rolla orange-yellow, about a quarter-inch broad, its five lobes spread salver-form, and the tube enclosed for about half its length in a bristly calyx with very narrow, . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectweeds
• bookyear1919