Paeonia mairei (Paeonia mairei)

Description

Paeonia mairei is a species of peony, that is endemic to the mountains of central China. Its vernacular name in China is 美丽芍药 (mei li shao yao) meaning "beautiful peony". The plant may be between 45–100 cm high and has mostly rose-pink flowers of about 10 cm across, one on each stem. P. mairei blooms in early spring. Paeonia mairei is a perennial herbaceous plant of up to 1 m high, that dies down in the autumn, and overwinters with buds just under the surface of the soil. It has thick roots that become thinner towards their tips, while the rootstocks is approximately 2 cm in diameter. Young shoots and leaves are initially red-purple to pink. The stems and leaves are hairless. The largest leaves, near the base of the stem are split into three, which parts themselves are split into leaflets, some of which may be incised, up to nineteen in total, 6—16½ × 1¾—7 cm, gradually broadening at their base and usually pointy at their tip. Veins are deeply sunken on the top-side of the leaf. Each stem bears only one flower at its tip of between 7½ and 14 cm wide. Each flower is accompanied by one to three leaflike or linear bracts of up to 9 cm long. Each flower has three to five, green and broadly oval sepals of 1—1½ × ⅞—1¼ cm. The seven to nine, inverted egg-shaped, pink to Spanish carmine petals are 3½—7 × 2—4½ cm, with a usually rounded tip. Within the circle of petals is a circle of stamens that consist of purple-red filaments topped by yellow anthers. Within is a low, yellow, ring-shaped disc, that encircles the base of the two or three carpels, which may be sparsely to densely covered in short yellow or golden brown felty hairs, or rarely hairless. Those are topped by styles of up to 4 mm long, that have red stigmas. Each carpel develops into a dry fruit that opens with a suture (or follicle) of 3—3½ × 1—1¼ cm. The inside of the fruit is bright red which contrast well with the blue shiny seeds. This peony species in his native range flowers in April and May, and produces seed in August. Paeonia mairei has both diploid and tetraploid populations (2n=10, 4n=20).