When did you start freezing jatropha curcas flowers?

In March, the cold of late spring began to freeze the flowers of Jatropha curcas, and the spring in China (around March) is a transitional period between winter and summer monsoon. During this period, intermittent cold air from the northwest often invades, and the cold air locks with the warm and humid airflow in the south, resulting in continuous low temperature and rainy weather.

Jatropha curcas has white, reddish flowers and cymes; Flowers are unisexual and hermaphroditic. Calyx irregular, 2 ~ 3-lobed, lobes valvate; Petals 5; The male flower has 8 ~ 20 stamens, the base of the filament is United, the upper end is separated, and the flower bud is bent inside; The ovary of female flower is 3 ~ 5 rooms, each room 1 ovule, 2 styles. The smell is slightly fragrant and the taste is astringent.

Extended data

Deciduous trees of tung tree, up to 10 m; Bark gray, nearly smooth; The branches are stout, hairless and have obvious lenticels. The leaves are oval, 8 ~ 18 cm long and 6 ~ 15 cm wide, with short blade tips, flat to shallow heart-shaped base, entire, and sparse 1 ~ 3 shallow cracks. The top of young leaves is soon puberulent, and the bottom is gradually puberulent in brown. The leaves that grow out are dark green and hairless, and the bottom is gray-green and sticky. 5 (~ 7) palmar veins; The petiole is almost as long as the leaf, almost hairless, and there are two flat sessile glands at the top.

Flowers monoecious, with leaves or leaves opening at the same time; Calyx is about 65438 0 cm long, 2-3-lobed, and the outside is densely brown puberulent; Petals are white, veins are reddish, obovate, 2 ~ 3 cm long, 1 ~ 1.5 cm wide, rounded at the top and claw-like at the base; Male flower: 8 ~ 12 stamens, 2 whorls; The outer wheel is free, and the inner wheel is unified below the middle of the filament; Female flower: ovary densely pilose, 3 ~ 5 (~ 8) locules, per locule 1 ovule, style as many as locules, 2-lobed.

Drupe is nearly spherical, with a diameter of 4 ~ 6 (~ 8) cm and a smooth peel. 3 ~ 4 (~ 8) seeds with woody seed coat. The flowering period is from March to April, and the fruiting period is from August to September.