裸萼球屬單莖多肉植物，原產阿根廷。莖扁球形至球形，頂部凹陷，外皮灰綠色至暗綠色，高約9cm，直徑7~14cm，14~18條圓形的稜。中刺新生時褐色，隨生長後變為灰色；側刺7~9支，向外彎曲，不同個體刺的長短差異大。漏斗形花粉紅色，花徑3~4cm。

A succulent plant of the genus Gymnocalycium, native to Argentina. Stem oblate-spherical to spherical, depressed at the top, bark gray-green to dull green, up to 9 cm high and 7-14cm across, with 14-18 round ribs. Central spines brown and turning gray with age. Radial spines 7-9, excurved, varied in length. Flowers funnel-shaped, pink, 3-4 cm across.

栽培：全日照通風環境下可生長良好，日照充足時可促進開花。炎夏時切勿讓植株曝曬，避免產生日燒等曬傷跡象。了防止爛根等情形，需採用排水透氣且微酸性的介質。高溫期生長，觀察介質乾就澆水。耐寒性強，只要不結凍低區，都可以在戶外栽培越冬。

This plants thrive in full-sun and airy conditions. Sufficient sunlight can promote flowering, however, strong exposure in high summer may cause signs of scorch, such as sunburn. Use draining and breathable soil to avoid root rot and other problems. As a summer grower, the plant needs watered whenever the soil appears dry during hot months; highly cold-resistant, it can survive winter outdoors as long as the site is frost-free in cold winters.

刺非常狂野豪邁，以欣賞刺為主。粉紅色的柔美花朵與植株型態有強烈的對比，適當栽培下相當容易開花。一般以單盆種植為主。因為刺較具危險性，擺放地點以不容易被觸及的位置為宜。

The ornamental plant is cultivated for its wild and rustic spines, which makes a strong contrast with its pink and graceful flowers. Easily flowering if cultivated properly. Usually planted alone, better keep it in locations from people to touch the dangerous spines.