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Yucca is a genus of perennial shrubs and trees in the family Asparagaceae, subfamily Agavoideae. [2] Its 40–50 species are notable for their rosettes of evergreen, tough, sword-shaped leaves and large terminal panicles of white or whitish flowers.
Yucca elata is a perennial plant, with common names that include soaptree, soaptree yucca, soapweed, and palmella. [3] [4] It is native to southwestern North America, in the Sonoran Desert and Chihuahuan Desert in the United States (western Texas, New Mexico, Arizona), southern Nevada, southwestern Utah, and northern Mexico (Chihuahua, Coahuila, Sonora, Nuevo León).
Yucca neomexicana Wooton & Standl. [3] is a plant in the family Asparagaceae, native to New Mexico, Colorado and Oklahoma. Common name is "New Mexican Spanish bayonet." It is similar to Y. harrimaniae Trel. but with a longer flowering stalk and white (rather than yellowish) flowers. [4] [5]
The Joshua tree is called "hunuvat chiy'a" or "humwichawa" by the indigenous Cahuilla. [11] It is also called izote de desierto (Spanish, "desert dagger"). [12] It was first formally described in the botanical literature as Yucca brevifolia by George Engelmann in 1871 as part of the Geological Exploration of the 100th meridian (or "Wheeler Survey").
Yucca decipiens Trel. [3] is a large, branching member of the Asparagaceae, native to north-central Mexico from Durango to San Luís Potosí. It is evergreen, up to 20 feet (6 m) tall, growing at elevations of 1500–2000 m in the mountains. Common name is "palma china," which means "Chinese palm."
Yucca brevifolia (Yucca palm or palm tree yucca) [74] Yucca filamentosa (Needle palm) [75] and Yucca filifera (St. Peter's palm), [76] flowering plants in the family Asparagaceae; Zamia furfuracea (Cardboard palm), a cycad in the family Zamiaceae [77] Zamioculcas zamiifolia (Emerald palm or aroid palm), a flowering plant in the family Araceae [78]
Yucca rostrata [3] also called beaked yucca, is a tree-like plant belonging to the genus Yucca. The species is native to Texas, and the Chihuahua and Coahuila regions of Mexico. This species of Yucca occurs in areas that are arid with little annual rainfall, normally Bw climates (desert) and Bs climates (steppe or semiarid). [4] [5]
Another study takes a look at coevolution as a primary driver of change and diversification in the yucca moth and the Joshua tree, more commonly known as the yucca palm. The researchers tested this hypothesis by setting up a differential selection of two species of yucca moths and two corresponding species of yucca palms which they pollinate.