. 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. 8. Centaurea Calcitrapa L. Star Thistle. Fig. 4663. Centaurea Calcitrapa L. Sp. PI. 917. 1753. Annual, pubescent or glabrous, green; stem much branched, not winged, i°-ii° high. Leaves 1-2-pinnatifid into oblong-lanceolate to linear, serrulate-spinulose, dentate or entire mostly acute lobes, the upper sessile and slightly clasping, the lower and basal short-pet
. 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. 8. Centaurea Calcitrapa L. Star Thistle. Fig. 4663. Centaurea Calcitrapa L. Sp. PI. 917. 1753. Annual, pubescent or glabrous, green; stem much branched, not winged, i°-ii° high. Leaves 1-2-pinnatifid into oblong-lanceolate to linear, serrulate-spinulose, dentate or entire mostly acute lobes, the upper sessile and slightly clasping, the lower and basal short-petioled, 4'-7' long, the uppermost somewhat involucrate at the bases of the sessile heads which are about 1' broad; invo- lucre ovoid, its outer bracts ovate-oblong, tipped with stout, spreading, yellowish spines which are simple, or commonly with 2-6 bristles at the base; flowers purple, none of them radiant; achenes compressed or obscurely 4-sided; pappus none. In waste places and ballast, southern New York and New Jersey to Virginia. Also from British Co- lumbia to California. Adventive or naturalized from Europe. Called also caltrops, maize- or mouse- thorn. Knop-weed. June-Oct. 9. Centaurea melitensis L. Rayless Winged Centaury. Fig. 4664. Centaurea melitensis L. Sp. PI. 917. 1753- Annual, i°-4° high, grayish-pubescent, much branched, the stem and branches narrowly winged by the decur- rent leaf-bases. Basal leaves lyrate, their lobes obtuse; stem leaves few-lobed or entire, the upper ones 1' long or less; heads sessile or nearly so; involucre about V thick, its principal bracts tipped by a slender purplish divergent spine 5" long or less, which is often branched below and with smaller spines at its base; flowers yel- low, none of them radiant; pappus scales unequal. Waste and cultivated grounds, Georgia to Missouri, Ari- zona, California and Oregon, and in ballast about the Atlantic seaports. Naturalized or adventive from Europe. Widely naturalized in South America
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
