. 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. 3iS CICHORIACEAE Vol. III. Leaves glabrous. Leaves entire to pinnatifid, hot sagittate at entire or denticulate, sagittate at base. 6. L. canadensis. 7. L. sagittifolia. B. Achenes truncate, or narrowed into stout beaks; rays blue to white. Perennial; achenes or biennials; achenes bright white. Achenes beakless ; leaves dentate, ac
. 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. 3iS CICHORIACEAE Vol. III. Leaves glabrous. Leaves entire to pinnatifid, hot sagittate at entire or denticulate, sagittate at base. 6. L. canadensis. 7. L. sagittifolia. B. Achenes truncate, or narrowed into stout beaks; rays blue to white. Perennial; achenes or biennials; achenes bright white. Achenes beakless ; leaves dentate, beaked ; leaves brown; achenes short-beaked. 8. L. pulchella. 9. 10. L. I. Lactuca virosa L. Prickly or WildLettuce. Fig. 4068. Lactuca virosa L. Sp. PI. 795. Serriola L. Cent. PI. 2: 29. Scariola L. Sp. PI. Ed. 2, 1119. 1763. Biennial, green and glaucous; stem stiff, leafy,usually paniculately branched, glabrous through-out, or bristly-hirsute at the base, 2°-7° oblong or oblong-lanceolate, spinulose-margined, dentictilate or pinnatifid, sessile orauriculate-clasping, the lowest sometimes 10long and 3 wide, the upper much smaller;midrib spinulose or hispid; heads 2-^ broad,6-i2-flowered; very numerous in an open pan-icle; involucre cylindric, i-ii thick, its outerbracts about one-third the length of the inner;rays yellow; achenes obovate-oblong, about aslong as the filiform beak; pappus white. In fields and waste places, Vermont to Georgia,west to the Pacific Coast. A troublesome from Europe. Consists of severalraces, differing in the form, lobing and position of the leaves. Milk- or hor
Size: 1407px × 1777px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
