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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. because the seeds can be difficult to remove from clothing and especially pet fur.
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]
These are small, weedy-looking annual plants with sticky, aromatic green foliage. The leaves are strongly lobed and look somewhat like fern fronds. Some plants have very few leaves and are mostly stems bearing flowers and fruits. The small flowers are bell-shaped and may be white or a light shade of pink or purple.
It is unusual as a shade-tolerant member of a mostly sun-loving genus. Jumpseed is a perennial, named for its seeds which can "jump" several feet when a ripe seedpod is disturbed. Persicaria virginiana blooms in midsummer to late summer/early fall. It has a stalk of small white flowers. [4]
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]
Silene noctiflora is a species of flowering plant in the family Caryophyllaceae known by the common names night-flowering catchfly, [1] nightflowering silene [2] and clammy cockle. It is native to Eurasia, but it is known on other continents as an introduced species and sometimes a weed .
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]
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]
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