Identifier: farmweedsofcana00clar (find matches)
Title: Farm weeds of Canada
Year: 1906 (1900s)
Authors: Clark, George Harold, 1872- Fletcher, James, 1852-1908 Criddle, Norman Canada. Dept. of Agriculture
Subjects: Weeds Weeds Botany
Publisher: Ottawa : Published by direction of the Minister of Agriculture
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: Ontario Council of University Libraries and Member Libraries

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thed with clusters ofleaves, which are smooth above, except for some very conspicuous long whitebristles, and are covered beneath with a thick felt of star-shaped hairs. Theflower heads are solitary, on slender stalks, pale yellow, over an inch acrossand sweetly scented. The seeds are a little longer than those of the OrangeHawkweed, but the seeds of all the four Hawkweeds here mentioned are prac-tically indistinguishable; all, however, are liable to occur in grass seeds ofwhich they are a dangerous impurity. The agricultural treatment for theeradication of all is the same and consists mainly of a short rotation withseeding down to clover and grass at short intervals. Acpordins? to Dr. X. L. Britton (Flora of the Xorthern States and Can-ada, 1901), the Prince Edward Island Mnttse-ear Hawkweed is the varietyPeleieriamim, Mer., of Hieracium Pilosella. The typical form of the speciesis found occasionally in the other provinces, having been introduced withEuropean grass seeds. 64 Plate 33
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BLUE LETTUCEI Lacfuca pulchella di) PLATE 33. BLUE LETTUCE, Laduca pulchclla. DC. Other English names: Showj Lettuce, Large-flowered Blue Lettuce.Other Latin names: Mulgedium pulchellum, Nutt.; Mulgedium acu-minatum, DC; Sonchus pulcliclliis, Pursh. Native. Perennial, deep-rooted. Stems 2 to 3 feet, leafy below. Wholeplant smooth and glaucous, filled with milky juice. Leaves very variable,nnear-lanceolate or oblong; entire, simply or runcinately dentate, or pin-uatifid; stem leaves less divided and sessile. Flower heads nearly 1 inchacross, pale blue, rather few, on scaly peduncles in a narrow panicle. Sef-<1<(Plate 56, fig. 68—natural size and enlarged 4 times) about ,,., of aninch, one-quurter of which is a short thick beak; tip of beak expandedinto a short cup-shaped disk; slaty gray when ripe, red when immature;,club-shaped, flattened, with thick rib-like margins and with narrower ridgeadown each face; in some seeds one or more of these ridges much thickened,whole surface

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