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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.
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]
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]
This annual succulent weed forms thick mats with fleshy leaves and small yellow flowers. It grows in a wide range of conditions, often appearing in gardens and disturbed soil. hongquang09
[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 ...
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]
Tall ageratum are also available in seed catalogues. They are about 18 inches (46 cm) in height with blue flowers. [4] [failed verification] There is also a medium-height snowcapped variety, white top on blue flowers. The blues are most popular and common, but colors also include violet, pink and white.
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