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There are also commercial crossbred hybrids which contain a mix of both ruderalis, indica or sativa genes, and are usually autoflowering varieties. These hybrid varieties exhibit traits from both parental types. In addition to pure indica, sativa, and ruderalis varieties, hybrid varieties with varying ratios of these three types are common, such as the White Widow hybrid which has about 60% indica and 40% sativa ancestry. Among the marijuana community however, sativa rather refers to equatorial varieties producing stimulating psychoactive effects (THC:CBD 1), whereas indica-type plants from Central Asia are used for relaxing and sedative drugs (THC:CBD > 1). Morphologically, the name sativa designates tall plants with narrow leaves, while indica refers to short plants with wide leaves. The informal designation sativa and indica may have various, controversial meanings. Sativa is known for being a more of a 'head high', energizing strain where psychoactivity is more common, whereas indica, is known for being more of a 'body high' that helps pain and is also used as a sedative. Avidekel, a medical marijuana strain developed in Israel, has a very low content of THC but a high content of CBD, limiting its psychoactive potential while exploring the beneficial medical effects of the latter. Unlike most commercially developed strains, indica landraces exhibit plants with varying THC/CBD ratios. The subjective effects of sativas and indicas are said to differ, but the ratio of tetrahydrocannabinol (THC) to cannabidiol (CBD) in most named drug varieties of both types is similar (averaging about 200:1). Sativas bloom later than indicas, often taking a month or two longer to mature. They are often favored by indoor growers for their size. Pure indica varieties are shorter and bushier, with wider leaflets.
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Pure sativas are relatively tall (reaching as high as 4.5 meters), with long internodes and branches, and large, narrow-bladed leaves.
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However, because Cannabis ruderalis flowers independently of the photoperiod and according to age, it has been used to breed autoflowering strains. A third species, Cannabis ruderalis, is very short and produces only trace amounts of tetrahydrocannabinol (THC), and thus is not commonly grown for industrial, recreational or medicinal use. The two species of the Cannabis genus that are most commonly grown are Cannabis indica and Cannabis sativa.