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Verbesina virginica, known by the common names white crownbeard, [1] or frostweed [2] is a species of flowering plant in the family Asteraceae. It is native to the Southeastern United States, where it is found in calcareous soil, often in bottomland thickets and edges of woods. [3] It is a tall perennial species. It produces heads of white ...
A giant hogweed plant usually produces a flowering stalk in 3–5 years, [2] [14] but plants may take up to eight years to flower if conditions are unfavourable. In the Czech Republic, a single plant reached twelve years old before flowering. [15] In any case, when the plant finally flowers, it does so between June and July (in the northern ...
Fumaria capreolata, the white ramping fumitory [2] or climbing fumitory, [3] is an herbaceous annual plant in the poppy family Papaveraceae.It is native to Europe, western Asia and northern Africa and naturalised in southern Australia, New Zealand, and southern South America.
Typically, its stems are branched and the clump forming plants emerge in late spring after most other plants have begun growth for the year. The oppositely arranged leaves are 7.5 to 15 cm (3 to 6 in) long and 1 to 4 cm ( 1 ⁄ 2 to 1 + 1 ⁄ 2 in) wide and are narrow and lance-shaped , with the ends tapering to a sharp point.
They grow in an alternate spiral up the stem, and the lower ones wither early. The flower heads are produced in dense inflorescences and are 1 cm (0.4 in) in diameter. Each individual flower has a ring of white or pale purple ray florets and a centre of yellow disc florets. The fruit is a cypsela tipped with dirty white down. [2]
Datura innoxia is quite similar to D. metel, to the point of being confused with it in early scientific literature. D. metel is a closely related plant, believed until recently to be of Old World provenance (though now thought to have been brought to Asia from the Antilles no earlier than the sixteenth century) and misconstrued as being referred to in the works of Avicenna in eleventh century ...
The leaves are opposite, simple broad lanceolate, 7–15 cm (2 + 3 ⁄ 4 –6 in) long and 3–5 cm (1 + 1 ⁄ 4 –2 in) broad, entire, and smooth on top with white hairs on the underside. It flowers from July to August, has large sepals, and a five-lobed white corolla. The flowers are hermaphrodite, with both male and female organs. [5]
Flowers lack petals, have 5 stamens and a round, green ovary with a 2-parted style at the tip that is not divided all the way to the base. Cupping the flower is a green calyx with 5 lobes 0.5 to 1.5 mm long and variable shape: triangular or egg-shaped, strongly keeled, blunt to rounded at the tip and thin and papery around the edges.