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Tecoma stans is a semi-evergreen shrub or small tree, growing up to 10 m (30 ft) tall. [1] It features opposite odd-pinnate green leaves, with 3 to 13 serrate, 8- to 10-cm-long leaflets. The leaflets, glabrous on both sides, have a lanceolate blade 2–10 cm long and 1–4 cm wide, with a long acuminate apex and a wedge-shaped base.
However, it should only be eaten in small quantities, since oxalic acid is an antinutrient and can inhibit the body's absorption supply of calcium. [7] Oxalis stricta, showing seed pods. The leaves and flowers of the plant are sometimes added to salads for decoration and flavoring.
One plant can produce as many as 1500 small yellow flower heads in a large conical array. The involucres of the main subspecies (S. a. subsp. altissima) are usually 3–4 millimeters, whereas those of S. a. subsp. gilvocanescens are usually 2–3 mm. [6]
Some species are familiar as ornamental plants cultivated for their large, colorful flowers. Most species produce yellow flowers; A. blanchetii bears pink flowers. [2] The genus name Allamanda honors the Swiss botanist and physician Frédéric-Louis Allamand (1736–1809). [3] It is the official flower of Kuching North City Hall. [4]
The small, yellow flowers are borne on a spherical or cylindrical spike or head (inflorescence). Each flower grows from the axil of a leathery bract. The fruit is a nonfleshy, dehiscent capsule. In Xyris complanata, a single flower bud on the spike appears in the morning, and expands into a conspicuous flower during the afternoon hours. [3]
Camissoniopsis micrantha is a species of flowering plant in the evening primrose family known by the common names miniature suncup or small evening primrose. [2] This is a small, hairy annual herb producing a basal rosette of leaves. It is characterized by small yellow flowers with petals less than 5 millimeters long.
The flowers are arranged singly or in small groups in the upper leaf axils, each flower on a stalk, 2–5 mm (0.08–0.2 in) long. The floral cup is 2 mm (0.08 in) long, smooth and hairy. The sepals are pale yellow, 4.5–5 mm (0.18–0.20 in) long, covered with short, soft hairs and have 4 or 5 feathery lobes.
Leaves around the base of the plant can be as much as 30 cm (1 foot) long, the leaves getting smaller higher on the stem. One plant can produce as many as 450 small yellow flower heads in a large, showy array. [5] Solidago juncea is often grown in gardens as an ornamental. [6] [7]