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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. because the seeds can be difficult to remove from clothing and especially pet fur. [8] [9] The seeding part of the plant—the upper stem—dies earlier than most other plants, and becomes very brittle. Often the ...
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]
It has numerous woody stems, alternating waxy leaves and clusters of small white flowers. It produces small (1.6 mm) fruits which each contain two reddish seeds. It has an extensive root network, known to reach 9 ft (2.7 m) in depth, and constituting 40% of the total biomass of the plant. [3]
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. [2]
The flowers are clustered in groups of two or three, and are borne out of the leaf axils. [13] The corolla bears 4 petals. [14] The globular fruits are burrs which grow one to three seeds clustered together; they are covered with hooked hairs which cling to animal fur and human clothing, aiding in seed dispersal. [13]
Fruit are light brown, rounded and 0.125 inches (3.2 mm) wide. Each fruit contains 2 or 4 seeds that are eaten by birds and can remain viable in the soil for decades. The stems climb by twisting around other plant stems in a counter-clockwise direction. [6] Flower with red velvet mites Convolvulus arvensis capsules and seeds Convolvulus ...
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The flowers also have 4 stamens of equal height instead of the 6 which are found in most closely related plants. Pollen grains are elongated, approximately 32 microns in length. Seeds. Below the flowers there are 4 sepals which are oblong shaped and 1.5–2.5 mm long and .3–.7 mm wide. The seeds are borne in upright pointing siliquae which ...