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Bidens alba is a fast-growing, fast-spreading weed due to its enormous number of seeds and the ability to re-grow from stems. [3] In sub-tropical to tropical conditions, B. alba can grow almost everywhere in full sun with little or no moisture.
The plant is 15–90 cm (6–35 in) tall. The fern-like leaves are lobed and grouped in threes, growing from the base and off the flowering stems. The flowers are 1–2 in (2.5–5.1 cm) long and have yellow petals with a red spur and red sepals. They appear in late spring (usually in May and June), nodding on stems above the leaves.
The lateral leaflets of each stem leaf may be lobed, giving the appearance of five leaflets per leaf. Each leaflet is up to 5 cm (2.0 in) long, with serrate leaf margins (edges) and branched (not parallel) veins. The flower stalk rises directly from the leaf whorl. The solitary flower is 2–2.5 cm (0.8–1.0 in) across with 4–9 (usually 5 ...
The erect, branching stem is purple, smooth, hollow, and sturdy. The compound leaves are bipinnate , with 3 to 5 leaflets per leaf. The total width of a lower leaf may be up to 2 ft (61 cm), and the leaflets are 0.75–4.5 in (1.9–11.4 cm) long and 0.5–2.5 in (1.3–6.4 cm) across.
The leaves have green or purple tips on each tooth. [2] [3] [4] The basal leaves are often pinnately divided. Habit. The flowering period is between May and October in northern Europe, or between June and August in Minnesota. [5] The inflorescence is a lax raceme, terminal or arising from the leaf axil, up to 34 cm long with up to 42 flowers ...
Alpine fleabanes, or daisies, are sunflower family members. They include dwarf mountain fleabane, or cut-leaf daisy [4]: 223 (Erigeron compositus), typifies the dwarfed growth pattern of the alpine zone, with disproportionately large flower heads compared to body size (1/4 to 1/2 the height of the flower stem).
It grows in the wild in great numbers in moist meadows. They are perennial plants with basal linear leaves measuring 20 to 80 centimetres (8 to 32 in) in length, which emerge early in the spring. They grow to a height of 30 to 130 cm (12 to 50 in), with a multi-flowered stem rising above the main plant in summer.
An annual or short-lived perennial growing to a maximum of 2.5 metres (8.2 ft), it has erect purplish stems and rounded umbels of minuscule white or pale pink flowers in late summer. [ 2 ] [ 3 ] Habitat and ecology