. The Indiana weed book. Weeds. WEEDS OF THE THISTLE FAMILY. 169 bright yellow with 5-9 rays. (Fig. 10, g.) Both species are too handsome to be called weeds, but if their room is needed they can be easily killed out by repeated mowing or by fertilization and cultivation of the soil. 136. Buti-iamia gbaminifolia L. Swamp Golden-rod. Bushy or Fra- grant Golden-rod. (P. N. 3.) Stem erect, glabrous, much branched, 2-A feet high; leaves numerous, linear-lanceolate, 3-5 nerved, pointed, the margins and nerves minutely rough-hairy. Heads small, numerous, sessile in a flat-topped terminal cyme or clus
. The Indiana weed book. Weeds. WEEDS OF THE THISTLE FAMILY. 169 bright yellow with 5-9 rays. (Fig. 10, g.) Both species are too handsome to be called weeds, but if their room is needed they can be easily killed out by repeated mowing or by fertilization and cultivation of the soil. 136. Buti-iamia gbaminifolia L. Swamp Golden-rod. Bushy or Fra- grant Golden-rod. (P. N. 3.) Stem erect, glabrous, much branched, 2-A feet high; leaves numerous, linear-lanceolate, 3-5 nerved, pointed, the margins and nerves minutely rough-hairy. Heads small, numerous, sessile in a flat-topped terminal cyme or cluster; involucre club-shaped, its bracts oblong, appressed, over- lapping, slightly viscid; flowers golden-yellow, the rays 12-20, disk-flowers S-12. Achene top-shaped, velvety-hairy. Very common in low moist grounds along borders of marshes and streams. July-Oct. From the golden-rods belonging to the genus Solidago this one is now separated by the rays being more numerous than the disk-flowers and by the receptacle being min- utely fringed, not closely pitted as there. The flat-topped flower cluster and narrow leaves also distinguish it from most of the others. It spreads both by long running rootstocks and seeds and, if left undisturbed, soon forms large patches and becomes trouble- some as a weed in damp hay meadows, being the most common of all golden-rods in low grounds. Since the roots are near the surface it can be easily destroyed by cultivation or shallow plowing and also by repeated mowings. 137. Inula helenium L. Elecampane. Horseheal. (P. I. 3.) Stems stout, tufted from large thick roots, simple or few branched, densely hairy above, 2-6 feet high; basal leaves broadly oblong, 10-20 inches long, 4-8 inches wide, long-stalked, rough above, woolly beneath; stem leaves smaller, ovate, alternate, sessile or clasping, pointed. Heads few or solitary, terminal, 2-4 inches broad; involucre saucer-shaped the bracts over- lapping in several rows, the outer ones ovate, leaf-like;
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1912
