The Myricaceae are a small family of dicotyledonous shrubs and small trees in the order Fagales.
 There are three genera in the family, although some botanists separate many species from "Myrica" into a fourth genus "Morella".
 About 55 species are usually accepted in "Myrica", one in "Canacomyrica", and one in "Comptonia".
An artificial Christmas trees is an artificial pine and fir tree manufactured for the specific purpose of use as a Christmas tree.
 The earliest artificial Christmas trees were wooden, tree-shaped pyramids or feather trees, both developed by Germans.
 Most modern trees are made of polyvinyl chloride (PVC) but many other types of trees have been and are available, including aluminum Christmas trees and fiber-optic illuminated Christmas trees.
Fruit pit carving (simplied Chinese:果核雕刻; traditional Chinese：果核雕刻; pinyin： guǒhédiāokè) is a Chinese folk handicraft in which the pits of peach, apricot, olive, Myrica rubra kernels, walnuts, and others are used to create minute patterns of the Buddha, nature, or the Chinese zodiac that are said to repel evil spirits.
 The carved pits are also used to create jewelry and decorations.
 Olive core carving has recently been recognized as Intangible Cultural Heritage in Guangdong Province, China.
 However, the art is now facing extinction because few black olive trees are planted in China and there are very few people interested in learning this art.
In computing, GiST or Generalized Search Tree, is a data structure and API that can be used to build a variety of disk-based search trees.
 GiST is a generalization of the B+ tree, providing a concurrent and recoverable height-balanced search tree infrastructure without making any assumptions about the type of data being stored, or the queries being serviced.
 GiST can be used to easily implement a range of well-known indexes, including B+ trees, R-trees, hB-trees, RD-trees, and many others; it also allows for easy development of specialized indexes for new data types.
 It cannot be used directly to implement non-height-balanced trees such as quad trees or prefix trees (tries), though like prefix trees it does support compression, including lossy compression.
 GiST can be used for any data type that can be naturally ordered into a hierarchy of supersets. Not only is it extensible in terms of data type support and tree layout, it allows the extension writer to support any query predicates that they choose.
 The most widely used GiST implementation is in the PostgreSQL relational database; it was also implemented in the Informix Universal Server, and as a standalone library, libgist.
In linguistics, in the study of syntax, an empty category is a nominal element that does not have any phonological content and is therefore unpronounced.
 Empty categories may also be referred to as covert nouns, in contrast to overt nouns which are pronounced.
 The phenomenon was named by Noam Chomsky in his 1981 framework.
 Some empty categories are governed by the empty category principle.
 When representing empty categories in trees, linguists use a null symbol to depict the idea that there is a mental category at the level being represented, even if the word(s) are being left out of overt speech.
 There are four main types of empty categories: NP-trace, Wh-trace, PRO, and "pro".
 The types are differentiated by their two binding features: the anaphoric feature [a] and the pronominal feature [p].
 The four possible combinations of plus or minus values for these features yield the four types of empty categories.
 Empty categories are present in most of the world's languages, although different languages allow for different categories to be empty.
Weeping trees are characterized by soft, limp twigs.
 This characterization may lead to a bent crown and pendulous branches that can cascade to the ground.
 While weepyness occurs in nature, most weeping trees are cultivars. Because of their shape, weeping trees are popular in landscaping; generally they need a lot of space and are solitary so that their effect is more pronounced.
 There are over a hundred different types of weeping trees.
 Some trees, such as the cherry, have a variety of weeping cultivars.
Myrica is a genus of about 35–50 species of small trees and shrubs in the family Myricaceae, order Fagales.
 The genus has a wide distribution, including Africa, Asia, Europe, North America and South America, and missing only from Australia.
 Some botanists split the genus into two genera on the basis of the catkin and fruit structure, restricting "Myrica" to a few species, and treating the others in "Morella".
Pleione (peacock orchid) is a small genus of predominantly terrestrial but sometimes epiphytic or lithophytic, miniature orchids.
 This genus is named after Pleione, mother of the Pleiades (in Greek mythology), and comprises about 20 species.
 Other common names of this genus include glory of the east, Himalayan crocus, Indian crocus and windowsill orchid.
 The genus "Diploconchium" is generally included here.
 "Pleione" is abbreviated to Pln in trade journals.
Hammock is a term used in the southeastern United States for stands of trees, usually hardwood, that form an ecological island in a contrasting ecosystem.
 Hammocks grow on elevated areas, often just a few inches high, surrounded by wetlands that are too wet to support them.
 The term hammock is also applied to stands of hardwood trees growing on slopes between wetlands and drier uplands supporting a mixed or coniferous forest.
 Types of hammocks found in the United States include tropical hardwood hammocks, temperate hardwood hammocks, and maritime or coastal hammocks.
 Hammocks are also often classified as hydric (wet soil), mesic (moist soil) or xeric (dry soil).
 The types are not exclusive, but often grade into each other.
Areas of forest which grow in KwaZulu-Natal, South Africa mostly on south facing slopes in higher rainfall areas, and along the humid coastal areas.
 Different types of forest can be identified by their species composition which depends mostly on the altitude, latitude and substrate (soil and rock types) in which they grow.
 South facing slopes are favourable for the development of forest as they are more shaded, and therefore cooler and retain more moisture than the northern slopes.
 The extra moisture on the south slopes is not only favoured by forest trees, but also helps to prevent or subdue wildfires.
 Fires can also be blocked by cliff faces and rocks or boulders on these slopes, and by streams or rivers at the base of the slopes.
 The coastal regions are conducive to forest formation, because of high rainfall and humidity which are favoured by forest trees and also help to prevent or subdue fires.
 The rivers of the coastal areas are also broader than further inland, which may often prevent fires from spreading long distances, and fires generally burn uphill and therefore more often away from areas at low altitude.

Question: Are Pleione and Myrica both types of trees?
Answer: no