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English: Amherstia nobilis with flower, new red leaves, and mature green leaves in April at Mounts botanical garden, West Palm beach, Florida, USA. Date 9 April 2022, 15:11:12
The deep green leaves are in opposite and decussate pairs, simple acute ovate, 3–8 cm (1–3 in) long with an untoothed margin; both the leaves and stems of the plant are hairy and slightly sticky. The upper leaves are stalkless. [4] Blooming from May to October, the unscented flowers are dark pink to red, each 1.8–2.5 cm (3 ⁄ 4 –1
The plant bears dark green dentate leaves that measure 6–16 centimetres (2.4–6.3 in) in length. The colored bracts—which are normally flaming red, with cultivars being orange, pale green, cream, pink, white, or marbled—are often mistaken for flower petals because of their groupings and colors, but are actually leaves.
The plant terminates in a dichotomous cyme, with a peduncle supporting each flower. [4] [13] The floral leaves are bifid (split in two parts) and ovate, while the involucral bracts are bright red, irregularly acuminate in shape (e.g., like a slipper), and about 1.1 to 1.3 mm (0.043 to 0.051 in) in length with a long, thin tube.
The leaves are alternate, trifoliate (with three leaflets), each leaflet 15–30 mm (5 ⁄ 8 – 1 + 1 ⁄ 8 in) long and 8–15 mm (3 ⁄ 8 – 5 ⁄ 8 in) broad, green with a characteristic pale crescent in the outer half of the leaf; the petiole is 1–4 cm (1 ⁄ 2 – 1 + 1 ⁄ 2 in) long, with two basal stipules that are abruptly narrowed ...
The bracts are photosynthetic and are sometimes called leaves. The inflorescence is a single flower with three green or reddish sepals and three petals in shades of red, purple, pink, white, yellow, or green. At the center of the flower there are six stamens and three stigmas borne on a very short style, if any. The fruit is fleshy and capsule ...
The upper side of A. rubrum ' s leaf is light green and the underside is whitish and can be either glaucous or hairy. The leaf stalks are usually red and are up to 10 cm (4 in) long. The leaves can turn a characteristic brilliant red in autumn, but can also become yellow or orange on some individuals.
The evergreen leaves are sessile, glossy, leathery, oval-lanceolate and toothed on the margins. They are arranged in whorls, usually with five or more leaves radiating from a single node. The small flowers have five petals and are pale green-yellowish, about 5–7 mm in diameter, [ 2 ] arranged at the top of long stalks.