Weeds of the west
The Western Society of Weed Science in cooperation with the Western United States Land Grant Universities Cooperative Extension Services, 1991 - Gardening - 630 pages
Learning to identify unwanted plants around the home, farm or ranch will be much easier with this book published by the Western Society of Weed Science and co-sponsored by the Cooperative Extension of the United States. Weeds of the West will help you identify weeds that compete with native plants, horticultural and agricultural crops, as well as those that can poison livestock and people.
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Sunﬂower Asteraceae 42
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12 inches long Achenes Asteraceae Sunﬂower family awns axils basal base biennial bracts branches Brassicaceae bristles calyx capsule clusters common creeping cultivated ﬁelds deeply lobed dense erect Eurasia Fabaceae feet tall ﬁrst ﬂat ﬂattened ﬂeshy Flowering heads ﬂowers ﬂowers are borne foxtail fruit green growing hairs hairy herbicides inch wide inches tall inﬂorescence introduced from Europe Iuly knapweed lance-shaped leaf axils Leaf blades leaﬂets Leaves are alternate ligule livestock margins maturity milkweed morningglory narrow native of Europe nightshade panicle pastures perennial petals petioles pigweed pink pistillate plant Poaceae Grass family pods poisonous proso millet prostrate purple racemes rangeland ray ﬂowers reproducing by seed rhizomes roadsides roots rosette Scrophulariaceae seedling sepals slender smooth soils Solanaceae species spikelets spikes spines spiny spreading stalks stamens stems taproot terminal thistle toothed University of Wyoming upper leaves usually waste areas western Wild winter annual woolly yellow ﬂowers Yellow starthistle