1, subject classification is different:

(1) Catharanthus roseus is also called climbing Catharanthus roseus. It belongs to Ericaceae, Catharanthus and Catharanthus.

(2) Catharanthus roseus, also known as Sun Ri Chun, Sun Ri Cao, Sun Ri Xin, Zhong Hua, Yan Hong, etc. It belongs to Juglans, Apocynaceae, Catharanthus and Changchun.

2. Different morphological characteristics:

(1) Catharanthus roseus: a creeping semi-shrub, with creeping stems and erect flower stems, without hair except for leaf margin, petiole, calyx and corolla throat. The leaves are oval, 2-6 cm long and 1.5-4 cm wide. Corolla blue, corolla tube funnel-shaped, corolla lobes obovate, long 12 mm. Flowering from March to May.

(2) Catharanthus roseus: a sub-shrub, slightly branched, with nearly square stems, and the whole plant is hairless or only slightly hairy. The leaves are membranous, obovate-oblong, 3-4 cm long and 1.5-2.5 cm wide, striped and grayish green; The internode length is 1-3.5 cm. Corolla red, saucer-shaped, corolla tube cylindrical, about 2.6 cm long. Flowering and fruiting are almost all year round.

3. Different habitats:

(1) Catharanthus roseus: Like warm and humid, like sunshine, tolerant to shade and a little cold, and like to grow in deep fertile and humid soil. Native to the Mediterranean coast and America, India and other places. It is cultivated in China, Jiangsu, Shanghai, Zhejiang, Hubei and Taiwan Province provinces.

(2) Catharanthus roseus: it likes high temperature, high humidity, semi-shade tolerance and cold resistance, and the optimum temperature is 20℃-33℃. It likes sunshine and is afraid of humidity and waterlogging. General soil can be cultivated. Origin: China coast, Indian and tropical America. Catharanthus roseus has a short cultivation history in China, mainly distributed in the south of the Yangtze River, and is more common in Guangdong, Guangxi, Yunnan and other provinces (autonomous regions).