生石花（学名：Lithops pseudotruncatella (Bgr.) N.E.B），俗称石头玉、屁股（**）、象蹄（香港），是番杏科生石花属（Lithops sp.，或称石头草属）物种的总称，被喻为「有生命的石头」。因其形态独特、色彩斑斓，是当下广受欢迎的观赏植物。

生石花具有明显的季节性，其原生地夏季相当干燥，通常夏天会休眠；到冬天照常生长。常见的生石花有：福来玉、花纹玉、日轮玉、朱弦玉、李夫人及寿丽玉等品种。生石花的种子非常细小，有如灰尘，播种时几乎看不到，而幼苗非常相似，必须等到成体才能分辨出为哪些种类。

Lithops is a genus of succulent plants in the ice plant family, Aizoaceae. Members of the genus are native to southern Africa. The name is derived from the Ancient Greek words λίθος (lithos), meaning "stone," and ὄψ (ops), meaning "face," referring to the stone-like appearance of the plants. They avoid being eaten by blending in with surrounding rocks and are often known as pebble plants or living stones. The formation of the name from the Greek "-ops" means that even a single plant is called a Lithops.