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A cactus graph. In graph theory, a cactus (sometimes called a cactus tree) is a connected graph in which any two simple cycles have at most one vertex in common. Equivalently, it is a connected graph in which every edge belongs to at most one simple cycle, or (for nontrivial cacti) in which every block (maximal subgraph without a cut-vertex) is an edge or a cycle.
Cactus was originally developed at the AEI, and is now developed jointly at AEI, Cardiff University, and the Center for Computation & Technology at LSU.There are several large packages built on Cactus, among others a general relativistic spacetime evolution code, an adaptive mesh refinement driver (Carpet), and a general relativistic hydrodynamics code (Whisky).
The Jardín de Cactus is a cactus garden on the island of Lanzarote in the Canary Islands. It is situated in the village of Guatiza , in a former quarry where volcanic sand lapilli (volcanic pyroclast , locally called "picón" or "rofe") was extracted to spread on cultivated areas to retain moisture.
Studies of permaculture farms have showed a diversity as well as a number of consistent features. A 2017 study of 36 self-described American permaculture farms found a variety of business strategies, including small mixed farms , integrated producers of perennial and animal crops, mixes of production and services, livestock, and service-based ...
The British Cactus & Succulent Society (BCSS) was founded in 1983 by the coalition of The National Cactus and Succulent Society (founded 23 August 1945 as The Yorkshire Cactus Society [3]) and The Cactus and Succulent Society of Great Britain (officially founded 8 March 1932, affiliated to the Royal Horticultural Society [4]). [5]
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A cactus (pl.: cacti, cactuses, or less commonly, cactus) [3] is a member of the plant family Cactaceae (/ k æ k ˈ t eɪ s i. iː,-ˌ aɪ /), [a] a family of the order Caryophyllales comprising about 127 genera with some 1,750 known species. [4]
Cylindropuntia is a genus of cacti (family Cactaceae), containing species commonly known as chollas (/ ˈ tʃ ɔɪ ə z /), native to northern Mexico and the Southwestern United States.