Search results
Results from the WOW.Com Content Network
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]
[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 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]
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
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 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.
Immature fruiting head Barbs on awn of Bidens pilosa Inflorescences. Bidens pilosa is an annual species of herbaceous flowering plant in the daisy family Asteraceae.Its many common names include hitch hikers, black-jack, beggarticks, farmer's friends and Spanish needle, but most commonly referred to as cobblers pegs.