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Author Beck, K. George ♦ Sebastian, James
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Abstract Leafy spurge is an aggressive, persistent, deep-rooted perennial, growing to a height of two to three feet or taller. Native to Europe and Asia, it was introduced to the United States in 1827. Leafy spurge now extends from southern Canada through the northern United States, and as far south as Texas. It has been documented in at least sixteen counties in Washington State. (Euphorbia esula) Root system: Leafy spurge roots are brown with pinkish buds. Plants have an extensive root system, ranging from a massive network of small lateral roots near the soil surface to deep, penetrating taproots that may extend to depths of twenty-one feet. This ability to maintain a large root system, and nutrient reserve, permits the plant to recover quickly from physical and most chemical damage. Stems and leaves: Stems arise from a woody root crown just below the soil surface. The stems are tightly clustered and bear narrow leaves that are one to four inch long. The leaves have a characteristic bluish-green color but turn yellow or reddish orange in the fall. When damaged, leaves and stems produce a milky latex liquid. Flowers: Leafy spurge produces clusters of yellowish-green petal-like structures called bracts, which surround the true flowers. The showy yellow bracts appear in late May and early June, giving the plant the appearance of blooming. However, the true flowers, which are small and green, do not develop until mid-June. The distinction between bract appearance and true flowering is important for effective timing of control measures. Fruits and seeds: Seeds are oblong, gray to purple, and occur in clusters of three. When dry, the seed capsules shatter, throwing seeds up to fifteen feet away from the parent plant. Seeds can remain viable in the soil for at least eight years and may germinate any time to re-establish an infestation. Reproduction: Leafy spurge reproduces by vegetative growth from spreading roots and by the production of large quantities of seeds that are often dispersed by birds, wildlife, humans, rivers and streams.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study