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Aiphanes Minima
''Aiphanes minima'' is a thorns, spines, and prickles, spiny Arecaceae, palm tree which is native to the insular Caribbean from Hispaniola to Grenada, and widely cultivated elsewhere. Usually tall, it sometimes grows as an understorey tree and only in height. Description ''Aiphanes minima'' is a single-stemmed, thorns, spines, and prickles, spiny palm with pinnately compound leaves—rows of leaflets emerge on either side of the axis of the leaf in a feather-like or fern-like pattern. Stems are usually tall, though occasionally as little as tall and in diameter. Younger stems are covered with rings of black spines, but on older stems these are often lost. Individuals bear 10–20 leaves which are pinnately compound, bearing 18 to 34 pairs of leaflets along a central rachis that is long. The leaflets are borne in a single plane, and are usually linear in shape, but sometimes widen towards their apex, especially in Puerto Rico. The lower surface of the leaf can be covered w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Gaertner
Joseph Gaertner (12 March 1732 – 14 July 1791) was a German botanist, best known for his work on seeds, ''De Fructibus et Seminibus Plantarum'' (1788-1792). Biography He was born in Calw, and studied in Göttingen under Albrecht von Haller. He was primarily a naturalist, but also worked at physics and zoology. He travelled extensively to visit other naturalists. He was professor of anatomy in Tübingen in 1760, and was appointed professor of botany at St Petersburg in 1768, but returned to Calw in 1770. Gaertner made back cross to convert one species into another. Back cross increases nuclear gene frequency His observations were: 1. Dominance of traits 2. Equal contribution of male and female to the progeny 3. No variation in F1 (first generation of descendants) 4. Large variation in F2 (second generation of descendants) including parental and intermediate types 5. Some of F2 plants had entirely new traits but he was unable to give possible explanation for observ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
