. 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 102nd meridian. adiant. Waste grounds, Massachusetts to New Jersey andPennsylvania. July-Aug. Genus io8. THISTLE FAMILY. 559 7. Centaurea americana Nutt. AmericanStar Thistle. Fig. 4662. C. americana Nutt. Journ. 2: 117. 1821. Plectocephahis americanus Don, in Sweet, Brit. (II) pi. 51. 1831. Annual, roughish; stem stout, simple, or littlebranched, 2°-6° high. Leaves ent
. 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 102nd meridian. adiant. Waste grounds, Massachusetts to New Jersey andPennsylvania. July-Aug. Genus io8. THISTLE FAMILY. 559 7. Centaurea americana Nutt. AmericanStar Thistle. Fig. 4662. C. americana Nutt. Journ. 2: 117. 1821. Plectocephahis americanus Don, in Sweet, Brit. (II) pi. 51. 1831. Annual, roughish; stem stout, simple, or littlebranched, 2°-6° high. Leaves entire or denticu-late, the lower and basal ones spatulate or oblong,2-5 long, narrowed into petioles, the upper ob-long-lanceolate, sessile, mucronate; heads solitaryat the much thickened ends of the leafy stem orbranches, very showy, 2-^ broad; involucrenearly hemispheric, its bracts ovate or lanceolatewith conspicuously pectinate appendages; flowerspink or purple, the marginal ones with enlargedand radiant corolla-limbs; achenes somewhatcompressed, obliquely attached at the base; pap-pus of copious unequal bristles longer than theachene. Dry plains, Missouri and Arkansas to Louisiana,Mexico and Arizona.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
