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Heliotropism, a form of tropism, is the diurnal or seasonal motion of plant parts (flowers or leaves) in response to the direction of the Sun. The habit of some plants to move in the direction of the Sun, a form of tropism, was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium, meaning "sun turn".
Leaves have 3-5 deep lobes. [3] Yellow flowers are crowded in the head, which is up to 3 ⁄ 8 inch (0.95 cm) across, flat-topped, with both disc flowers and ray flowers. [3] "Confertiflorum" means densely flowered. [3] It blooms from January to July. [3] The fruit is an achene with a very short pappus.
The bottom sides of the leaves are distinct with a velvety brown coating. [5] The large flowers are 3.5–6.0 centimetres (1.4–2.4 in) in diameter, a rich yellow, sometimes with orange, coppery, or reddish margins surrounding the base. [6] Their blossoms are borne in great showy masses, and tend to bloom one at a time.
Prolonged exposure to overspray of glyphosate will cause yellow leaves and new leaves will be small and elongated. Hormone weed sprays (e.g. 2,4-D and 2,4,5-T) may cause grotesque new growth with thin twisted leaves and distorted buds. Plants may die in severe cases.
Verbesina alternifolia is a species of flowering plant in the family Asteraceae. It is commonly known as wingstem [2] or yellow ironweed. [3] It is native to North America. [2] The name "wingstem" refers to the petioles of the leaves, which run down the stem and form raised ridges or "wings" along it. [4]
The flowers are nodding and the sepals usually yellow, but sometimes yellowish-pink or raspberry pink, reflexed, and 12–20 mm (0.5–0.8 in) in length. The petals are white or cream and 7–10 mm long, with the stamens extending beyond them. The nectar spurs are yellow to raspberry pink, slightly curved, and measure 10–20 mm (0.4–0.8 in). [3]
The plant has pinnately compound leaves with 5–11 membranous leaflets. It has axillary flower and fruit clusters. [3] The buds are hairy. The dark green leaves are bitter-aromatic, with crenate margins. [3] [6] The stalked follicles are green and then turn red [6] through deep blue through black. [3] [7] Flowers are dioecious, with yellow ...
Flowers bloom from summer to fall. The long funnel-shaped sometimes-fragrant yellow (less commonly apricot, sometimes white) flowers are in few-flowered terminal clusters. [ 5 ] Its fruit is deep red-black in color encasing a large seed that bears some resemblance to a 'Chinese lucky nut.' [ clarification needed ]