一种仙人掌类植物，尤指仙人球属和刺仙人掌属，有多刺的茎，成不分支的球状或圆柱状。
Any of several cacti, especially in the genera Ferocactus and Echinocactus, having unbranched, globular to columnar, ribbed spiny stems.
叶互生，无柄，圆柱状，肉质，基部扩大的，先端钝或具芒；叶腋束状具柔毛。
Leaves alternate, sessile, terete, fleshy, base expanded, apex obtuse or aristate awned; leaf axil fascicular pilose.
当扫描层面和它们的长轴平行时，肺动脉分支和支气管呈圆柱状或远端变细分叉，这取决于它们在扫描层面内的长度和走行。
When imaged along their axis, bronchi and vessels should appear roughly cylindrical, or show slight tapering as they branch, depending on the length of the segment that is visible.
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