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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]
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.
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
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]
Geijera parviflora, commonly known as wilga, [2] is a species of shrub or small tree in the family Rutaceae and is endemic to inland parts of eastern Australia. It has drooping branches, linear to narrow lance-shaped leaves, small white flowers in loose panicles and spherical fruit containing a shiny black seed.
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.
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