English:
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
Text Appearing After Image:
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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