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Rhodiola pachyclados grows 2–3 cm tall and spreads through thin, underground stems called rhizomes, which are 2–4 mm wide. It forms clusters of rosettes—compact, circular arrangements of leaves—each with 12–18 thick, bluish-green evergreen leaves about 1.5–2.5 cm across. Below these, a few withered old leaves may persist.
Succulent plants have thickened stems, or leaves, such as this Aloe. In botany, succulent plants, also known as succulents, are plants with parts that are thickened, fleshy, and engorged, usually to retain water in arid climates or soil conditions. The word succulent comes from the Latin word sucus, meaning "juice" or "sap". [1]
The genus name "Lampranthus" means "shining-flowers" in Greek, and the species of this genus have unusually large, bright flowers, of a range of colours (sometimes even bi-coloured), that usually appear in summer, and frequently cover the plants entirely. The species of this genus typically have long, smooth, elongated, succulent leaves.
Other species of cactus with long-lasting leaves, such as the opuntioid Pereskiopsis, also have succulent leaves. [18] A key issue in retaining water is the ratio of surface area to volume. Water loss is proportional to surface area, whereas the amount of water present is proportional to volume.
Leaves of most plants include a flat structure called the blade or lamina supported by a network of veins, a petiole and a leaf base; [1] but not all leaves are flat, some are cylindrical. [ citation needed ] Leaves may be simple, with a single leaf blade, or compound, with several leaflets .
The genus has been described as containing up to 600 species, subsequently reduced to 400–500. They are leaf succulents found primarily in the Northern Hemisphere, but extending into the southern hemisphere in Africa and South America. The plants vary from annual and creeping herbs to shrubs. The plants have water-storing leaves.
Sempervivoideae is the largest of three subfamilies in the Saxifragales family Crassulaceae, with about 20–30 genera with succulent leaves. Unlike the two smaller subfamilies, it is distributed in temperate climates. The largest genus in this subfamily is Sedum, with about 470 species.
Aloeae is a tribe of succulent plants in the subfamily Asphodeloideae of the family Asphodelaceae, consisting of the aloes and their close relatives.The taxon may also be treated as the subfamily Alooideae by those botanists who retain the narrower circumscription of Asphodelaceae adopted prior to the APG III system.