. Les herbes de la ferme des États-Unis ; un traité pratique sur l'herbe, à l'ensemencement des cultures et la gestion des prairies et pâturages, la description des meilleures variétés, les semences et de ses impuretés, des herbes pour des conditions spéciales, etc., etc. être presencemay prise comme une bonne preuve de l'origine de la semence.Chess (^Bromus secalinus), marguerite blanche (^Chrysanthe-mom, leucanthemum), mince-(Juncus tenuis) {^Lepedium,peppergrass virginicum), étroit-leavedplantain, cinq doigts, et l'oseille sont aussi frequentlyfound. California blue-grass contient généralement des semences de ressortir des carex (^Carcx spp.), le rush,

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. Farm grasses of the United States; a practical treatise on the grass crop, seeding and management of meadows and pastures, descriptions of the best varieties, the seed and its impurities, grasses for special conditions, etc., etc. presencemay be taken as good evidence of the origin of the seed.Chess (^Bromus secalinus), ox-eye daisy (^Chrysanthe-mum leucanthemum, ), slender-rush (Juncus tenuis), peppergrass {^Lepedium virginicum), narrow-leavedplantain, five-finger, and sorrel are also frequentlyfound. Kentucky blue-grass usually contains seed of someof the sedges (^Carcx spp.), slender-rush, and oftenshepherds purse (Ca/i^f//a bursa-pastoris), chickweed(Cerastium spp.), peppergrass, and sorrel. Dealers frequently attempt to distinguish Canadafrom Kentucky blue-grass by running the hand into theseed to see if Canada thistle spines are present. As Ken-tucky blue-grass frequently contains spines of horse-nettle (^Solanum carolinense), which closely resemblethose of Canada thistle, this test cannot be relied uponand is apt to be misleading. Contrary to the commonbelief, Canada blue-grass seldom contains seed ofCanada thistle, although the spines are usually present.While the seed is much easier cleaned than that of. FIG. 14—WEED-SEEDSa, Peppergrass {Lepidium virginimm); b^ Slender Rush {Juncus tenuis);c, Velvet-grass {Holcus lanaius); d, Fivefinger {JPotentilla monspeliensis);€?, Oxeye Daisy {Chrysanikemum. leucanthemuvi); _/, Sorrel {Rumexaceiosella); g^ False Flax {Cameiina sativa) k, Canada Thistle{Carduus arvensts). 67 68 FARM GRASSES OF THE UNITED STATES Kentucky blue-grass, it often contains dog-fennel (An-themis cotula), peppergrass, and five-finger. Redtop seed usually contains but few weed seeds, among the most common being slender-rush and sor-rel. (The seeds of some of the most common weedsare shown in Fig. 14.) ADUI^TERATION A few of our common grass-seeds are frequentlyand wilfully adulterated. The most important of theseare orchard-grass and Kentucky

Recherche dans la banque de photos par tags

• bookcentury1900
• bookdecade1910
• booksubjectgrasses
• bookyear1916