#xerophytic plants
- Acanthocrater — A genus of xerophytic, often spiny, cushion-forming perennial plants belonging to the Plumbaginaceae family. These plants are native to the arid and mountainous regions of Central Asia and the Middle East (particularly Iran and Afghanistan), morphologically adapted to rocky, nutrient-poor soils and harsh climates with extreme temperature fluctuations.
- Agava — The common name of monocotyledonous xerophytic plants within the genus Agave, native to the arid and semi-arid regions of the Americas, particularly Mexico. These plants are structurally characterized by a dense rosette of large, fleshy, rigid leaves, often tipped with sharp spines, and a gigantic, spectacular inflorescence that appears only once at the end of the plant's life cycle, cultivated worldwide for textile fibers, alcoholic beverage production, or as ornamental plants.
- Agave americana — A famous species of succulent and xerophytic plant within the genus Agave, native to Mexico and the United States, but widely naturalized globally, including the Mediterranean basin. Commonly known as the American aloe or century plant due to the misconception that it blooms only once every hundred years, it is distinguished by its impressive size, grayish-green leaves with spiny margins, and a spectacular inflorescence that can reach up to eight meters in height.
- Aloe humilis — The scientific name of the dwarf aloe (or spider aloe), a small-sized species of succulent plant in the family Asphodelaceae, native to the Cape Province of South Africa. This structural ornamental plant forms dense, compact rosettes lacking an aerial stem, with triangular, erect-incurved bluish-green leaves completely covered on both sides with white tubercles and soft, fine spines, being highly popular as a houseplant due to its high resilience.
- Mountain alyssum — A perennial herbaceous plant species within the genus Alyssum, family Brassicaceae, distributed across the mountainous and hilly areas of Europe; commonly known as mountain alyssum or mountain madwort. The plant features prostrate stems at the base, grayish leaves covered with stellate hairs, and fragrant yellow flowers grouped in dense racemes, making it ideal for rock gardens due to its high drought resistance.
- Ariocarpus — A genus of cacti endemic to the semi-desert zones of Mexico and southern Texas, characterized by extremely slow growth, flattened globular stems, and unique, triangular or rocky tubercles lacking classic spines at maturity; these succulent plants have a massive taproot used as a water reservoir and are highly prized by collectors for their large flowers and mimetic appearance mimicking surrounding limestones.
- Astrophytum — A genus of succulent plants within the Cactaceae family, native to the arid and semi-desert regions of Mexico and the southern United States (Texas). These cacti are characterized by globose or cylindrical stems, often lacking spines in adult state, decorated with prominent ribs and microscopic white dots formed by coarse hairs (trichomes), possessing a general star-like appearance reminiscent of a star or marine astroid.
- Astrophytum capricorne — A species of xerophytic plants within the Astrophytum genus (Cactaceae family), native to the semi-desert regions of Mexico (Chihuahuan Desert), characterized by a spherical stem that becomes cylindrical at maturity, divided into 7-8 sharp ribs. The species is distinguished by its long, flexible, flattened, and twisted spines reminiscent of a goat's horns (or a capricorn's), and by its large, yellow flowers with a deep purple or red center.