 Why weeds are so pertinacious and aggressive is too large and loose a question; for any herb whatever when successfully aggressive becomes a weed ; and the reasons of predominance may be almost as diverse as the weeds themselves. But we may inquire whether...  The Weed Flora of Iowa - Page 704by Louis Hermann Pammel, Charlotte M. King - 1913 - 912 pagesFull view - About this book
 | Geology - 1879 - 546 pages
...of the weeds of the United States, and probably of similar temperate countries, should be foreignera As to the second question, this is strikingly the...derived : for instance, Mollugo verticillata, Erigeron Canadense, Xanihium, Ambrosia artemisuxfolia. Verbena haslala, V. urticifotia, etc., Vei-onica peregrina,... | |
 | Asa Gray - Botanists - 1889 - 520 pages
...country. 1 American Journal of Science and Arts, 3 ser., rviii. 161. (1879.) Why weeds are so pertiuaceous and aggressive, is too large and loose a question...verticillata, Erigeron Canadensc, Xanthium, Ambrosia artemisicefolia, Verbena hastata, V. urticifolia, etc., Veronica peregrina, Solanum C'arolinense, various... | |
 | Asa Gray - Botanists - 1889 - 520 pages
...1 American Journal of Science and Arts, 3 ser., rriii. 161. (1879.) Why weeds are so pertitiaceous and aggressive, is too large and loose a question...derived : for instance, Mollugo verticillata, Erigeron Canadcnse, Xanthium, Ambrosia artemisicefolia, Verbena hastata, V. urticifolia, etc., Veronica peregrina,... | |
 | Asa Gray - Botanists - 1889 - 552 pages
...native herbs which, if they could bear the exposure at all, were capable of competition on cleared laud with emigrants from the Old World. It may be said...appear to have been thus derived: for instance, Mollugo vertictilata, Erigeron Canadenac, Xanthiinn, Ambrosia artemisicefolia, Verbena hastata, V. vrticifolia,... | |
 | Louis Hermann Pammel - Grasses - 1918 - 938 pages
...Virginia appropriated the shores of the Chesapeake, than have the homely weeds of England and Prance made themselves at home in the New World: established...appear to have been thus derived; for instance, Mollugo verticHlata, Erigeron canadense, Xanthium, Ambrosia artemisiaefolia, Verbena hastata, V. urticifolia,... | |
 | Iowa Geological Survey - Botany - 1913 - 940 pages
...appropriated its fields, its gardens and its waysides. Nor have the older states alone been seized V those European invaders. The stream has flowed beyond...derived; for instance, Mollugo verticillata, Erigeron ccmadense, Xanthium, Ambrosia artemisiaefolia, Verbena hastata, V. urticifolia, etc., Veronica peregrina,... | |
 | Iowa Geological Survey - Botany - 1913 - 938 pages
...those European invaders. The stream has flowed beyond them, and as no village or hamlet in the west i« without its population of European descent, so too...derived; for instance, Mollugo verticillata, Erigeron canadense, Xanthium, Ambrosia artemisiaefolia. Verbena hastata, V. urticifolia, etc., Veronica peregrina,... | |
 | 1879 - 1080 pages
...of the weeds of the United States, and probably of similar temperate countries, should be foreignera As to the second question, this is strikingly the...appear to have been thus derived: for instance, Mollugo verlicillata, Erigeron Canadense, Xanthium, Ambrosia artemisicefolia. Verbena hastala, V. urticifolia,... | |
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