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Hackelia virginiana has simple, rough leaves and ribbed green stems. The plant is categorized Wetland Indicator Status: FACU (Facultative Upland). [6] The flowers are small and white, bourne in mid-late summer. [7] The seeds are burs, and are very sticky. The plant is native but a well-known nuisance in deciduous forests of the eastern U.S ...
Thlaspi arvense is a foetid, hairless annual plant, growing up to 60 cm (24 in) tall, [2] with upright branches. The stem leaves are arrow-shaped, narrow and toothed. It blooms between May and July, with racemes or spikes of small white flowers that have 4 sepals and 4 longer petals. [3]
The first step to removing weeds from your lawn and garden is identification. Learn about 20 common types of weeds and how to treat them.
Colors of the flower-heads of Bidens alba vary depending on the subspecies; some B. alba have yellow, tubular central blossoms and others may have flower-heads with white or cream petals (1.5 cm or 5 ⁄ 8 in long); eventually they form black linear seeds, yielding approximately 1200 seeds per plant.
[3] [4] The small white flowers are borne in a raceme without any bracts, [4] soon followed by the seeds and often continuing to flower as the first seeds ripen. The flowers have 4 white petals (which may be lacking but are mostly present) [5] which are 1.5–4.5 mm long and spatulate shaped. The flowers also have 4 stamens of equal height ...
The flowers are pollinated by various bees like Andrena agilissima and flies (entomophily). Rhamphospermum arvense is the host plant of the caterpillars of some Lepidoptera, such as the small white, Pieris rapae. The seeds are toxic to most animals, except birds, and can cause gastrointestinal problems, especially if consumed in large quantities.
Common ragweed is a very competitive weed and can produce yield losses in soybeans as high as 30 percent. Control with night tillage reduces emergence by around 45 percent. Small grains in rotation will also suppress common ragweed if they are overseeded with clover. Otherwise, the ragweed will grow and mature and produce seeds in the small ...
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