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在美国的亚利桑那州和墨西哥,原生一种仙人掌科植物江宁玉(Ferocactus emoryi)它是强刺属(Ferocactus),也有划为金琥属(Echinocactus)。现在许多国家的植物园、公园、个人等都引种栽培。江宁玉初期生长是球形,成球是园柱形,直径可达60cm,高可超过3m。它小时具有8～13条枝,然后随球体的长大而增棱,最多达到32条。棱的高度在3～4cm左右,球体小时刺座在乳突峰上,无法分清棱数。球体青绿色(在培养中也有球体为绿紫色的称为紫体江守,还有球体颜色偏白呈浅灰绿色的称为面白江守)。球体大时棱略呈螺旋状,每一刺座具有周刺7～8根,长度是3～6cm,放射状,稍弯向球体。中刺1根直射,先端钩状,刺长8cm。除周刺有时有2根左右为乳白色外,其它都是带环纹的鲜红刺,美丽无比,尤如人工雕刻之艺术品,耐人寻味。在刺长出前,刺座首先长出黄色绒毛,然后由绒毛内长出刺来,刺新生时为极鲜艳的红色,但有时会因管理不当,或随球龄的增加使刺逐渐褪色。江守玉
In Arizona and Mexico in the United States, the native cactaceae, Ferocactus emoryi, is a species of the genus Ferocactus, also known as the genus Echinocactus. In many countries, botanical gardens, parks, and individuals are now introduced and cultivated. Jiangning jade initial growth is spherical, into a ball is cylindrical, diameter up to 60cm, high can be more than 3m. It has 8 to 13 branches in hours and then increases with the growth of the sphere up to 32. Prism height of 3 ~ 4cm or so, the sphere of small thorn seat in mastoid peak, can not distinguish between the number of edges. Sphere turquoise (in culture there are spheres of green purple called purple body Shou, as well as the sphere of white color is pale gray green white surface Shou). Sphere when the ball is slightly spiral slightly, each thorn seat with a week stab 7 ~ 8, the length is 3 ~ 6cm, radial, slightly curved to the ball. Spurs a direct shot, apex hooked, thorn length 8cm. In addition to the Zhou thorn sometimes 2 or so for the milky white, the other are with fresh red ring thorns, beautiful, as artificially carved artwork, thought-provoking. Before the pricker grows out, the pricker first grows yellow fuzz, then grows from the fuzz to stab the newborn with a very bright red color, but sometimes it will fade due to improper management or with the increase of the ball age. Jiang Shouyu