. Botany, an elementary text for schools. Botany. 496. Xanthium Canadense. 1. TARAXACUM. Dandelion. Stemless herbs, the 1-headed scape short, leafless and hollow: florets all perfect and strap-shaped: fruit ribbed, the pappus raised on a long beak. T. officinMe, "Weber {T. Dens-leonis, Desf.). Common dandelion. Figs. 8, 275. Perennial, introduced from the Old World: leaves long, pinnate or lyrate: heads yellow, opening in sun. 2. CICHORITJM. Chicory. Tall, branching perennials, with deep, hard roots: florets perfect and strap-shaped : fruit lightly grooved, with sessile pappus of many sma
. Botany, an elementary text for schools. Botany. 496. Xanthium Canadense. 1. TARAXACUM. Dandelion. Stemless herbs, the 1-headed scape short, leafless and hollow: florets all perfect and strap-shaped: fruit ribbed, the pappus raised on a long beak. T. officinMe, "Weber {T. Dens-leonis, Desf.). Common dandelion. Figs. 8, 275. Perennial, introduced from the Old World: leaves long, pinnate or lyrate: heads yellow, opening in sun. 2. CICHORITJM. Chicory. Tall, branching perennials, with deep, hard roots: florets perfect and strap-shaped : fruit lightly grooved, with sessile pappus of many small, chaffy scales. C. tntybus, Linn. Common chicory, run wild along'roadsides (from Europe): 2-3 ft.: leaves ob- long or lanceolate, the lowest pinnatifld : flowers bright blue or pink, 2-3 together in the axils on long nearly naked branches. 3. XANTHIUM. Clotbur. Coarse homely annual weeds with large alter- nate leaves, flowers monoecious: in small involucres: sterile involucres composed of separate scales, in short racemes: fertile involucres of united scales forming a closed body, clustered in the leaf axils, becoming spiny burs. X. Canadense, Mill. Common clotbur. Fig. 496. One to 2 ft., branch- ing: leaves broad-ovate, petioled, lobed and toothed: burs oblong-conical, 1 in. long, with 2 beaks. Waste places. X. spindsum, Linn. Spiny clotbur. Pubescent, with three spines at the base of each leaf: bur % in. long, with 1 beak. Tropical America. 4. AMBROSIA. Ragweed. Homely strong-smelling weeds, monoecious: sterile involucres in racemes on the ends of the branches, the scales united into a cup: fertile involucres clustered in the axils of leaves or bracts, containing 1 pistil, with 4-8 horns or projections near the top. Following are annuals: A. artemisisefdlia, Linn. Common rugiveed. Fig. 497. One to 3 ft., very branchy: leaves opposite or al- ternate, thin, once- or twice-pinnatifid : fruit or bur globular, with 6 spines. Roadsides and waste places. A. trifida, Linn. Great r
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
