. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 460 COMPOSITAE. Vol. III. series, pistillate, fertile, the ligules numerous, linear. Disk-flowers perfect but sterile, their corollas tubular, 5-toothed, the style undivided. Anthers minutely 2-toothed or entire at the base. Achenes broad, dorsally flattened, 2-winged, notched at the apex. Pappus none, or of 2 awns confluent with the wings of the achene. [Greek
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 460 COMPOSITAE. Vol. III. series, pistillate, fertile, the ligules numerous, linear. Disk-flowers perfect but sterile, their corollas tubular, 5-toothed, the style undivided. Anthers minutely 2-toothed or entire at the base. Achenes broad, dorsally flattened, 2-winged, notched at the apex. Pappus none, or of 2 awns confluent with the wings of the achene. [Greek, from the resinous juice.] About 12 species, natives of North America, known as Rosin-weed or Rosin-plant. Type species: Silphium Asteriscus L. Stem leafy, the leaves opposite, alternate, or verticillate. Leaves, or their petiole-bases, connate-perfoliate ; stem square. 1. 5. perfoliatum. Leaves not connate-perfoliate, sessile or petioled. Leaves opposite, or the uppermost alternate; cauline sessile. • 2. Leaves, or some of them, verticillate in 3's or a's, petioled. 3. Most or all of the leaves alternate, entire or dentate. 4. Leaves all alternate, pinnatifid or bipinnatifid, large. 5. Stem leafless or nearly so, scaly above; leaves basal, large. Leaves sharply serrate to pinnatifid; achenes obovate. 6. Leaves coarsely dentate; achenes suborbicular. 7. 5. integrifolium. S. trifoliatum. S. Asteriscus. S. laciniatum. S. terebinthinaceum. S. i. Silphium perfoliatum L. Cup- plant. Indian-cup. Fig. 4421. S. perfoliatum L. Sp. PI. Ed. 2, 1301. 1763. Stem square, glabrous, or rarely some- what hispid, branched above, or sometimes simple, 4°-8° high. Leaves ovate or deltoid- ovate, opposite, the upper connate-perfol- iate, the lower abruptly contracted into margined petioles, all thin, usually scabrous on both sides, or pubescent beneath, coarse- ly angulate-dentate, or the upper entire, the larger 6'-i2' long, 4'-8' wide; heads com- monly numerous, 2'~3' broad; rays
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
