This species , native to North America, is a low-growing (syn. S. apus) plant that rapidly spreads to form a yellow-green carpet. It is often used as underplanting in the.
It cannot be grown indoors inbecause the level of would be too low for healthy growth, but it does well in a miniature conservatory, plant-case or bottle garden. It does well in cool conditions and should never be exposed to direct sunlight.
pallescens (syn. S. emmeliana)
This, native to Mexico, has upright branches reaching a length of 30 cm (12 inch). The are terminated by a spiny point; the lateral are larger than those growing in the centre of the . It requires constantly moist, but not sodden, . It does well indoors. Another species well-known even to amateurs is S. lepidophylla, native to the dry regions of California and Mexico. Its curl into a tight brownish ball in dry conditions. When moisture is provided, by putting it in a dish with water, for example, it ‘comes to life’ by unfurling into a green rosette. This property, called hydrochasia, is retained by the plants for several years.