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:''This article is about the plant family. For the genus '''Cactus''', see [[Mammillaria]], [[Melocactus]], and [[Opuntia]].''
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Cactaceae (from the old Linnaean genus Cactus, a name used by the ancients to denote any spiny plant). Cactus Family. Fig. 41. Fleshy plants with watery or milky juice, a great reduction or complete absence of foliage, and very thick, rather sparingly branched, rarely unbranched stems, which are cylindrical, globular, flattened, or fluted, and often constricted or jointed: leaves alternate, flat and leaf-like in Pereskia, scale-like or absent in other genera, usually bearing bundles of spines in the axils, which are trichomes, and which are of two kinds, long and stout, or minute and needle-like: flowers bisexual, mostly regular, perigynous or epigynous; sepals and petals rarely 8-10, usually very many, similar; stamens many, inserted spirally or in groups on inside of the receptacle; ovary inferior, 1-celled, with 3 to many parietal placentae; ovules numerous; style 1; stigmas as many as the placenta: fruit a berry; embryo straight or curved.
Cactaceae (from the old Linnaean genus Cactus, a name used by the ancients to denote any spiny plant). Cactus Family. Fig. 41. Fleshy plants with watery or milky juice, a great reduction or complete absence of foliage, and very thick, rather sparingly branched, rarely unbranched stems, which are cylindrical, globular, flattened, or fluted, and often constricted or jointed: leaves alternate, flat and leaf-like in Pereskia, scale-like or absent in other genera, usually bearing bundles of spines in the axils, which are trichomes, and which are of two kinds, long and stout, or minute and needle-like: flowers bisexual, mostly regular, perigynous or epigynous; sepals and petals rarely 8-10, usually very many, similar; stamens many, inserted spirally or in groups on inside of the receptacle; ovary inferior, 1-celled, with 3 to many parietal placentae; ovules numerous; style 1; stigmas as many as the placenta: fruit a berry; embryo straight or curved.
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{{Taxobox
{{Taxobox
| color = lightgreen or brownish
| color = lightgreen or brownish