Chloranthaceae

Chloranthaceae ˌklɔərænˈθeɪʃiː is a family of flowering plants (angiosperms), the only family in the order Chloranthales. It is not closely related to any other family of flowering plants, and is among the early-diverging lineages in the angiosperms. They are woody or weakly woody plants occurring in Southeast Asia, the Pacific, Madagascar, Central and South America, and the West Indies. The family consists of four extant genera, totalling about 77 known species according to Christenhusz and Byng in 2016. Some species are used in traditional medicine. The type genus is Chloranthus. The fossil record of the family, mostly represented by pollen such as Clavatipollenites, extends back to the dawn of the history of flowering plants in the Early Cretaceous, and has been found on all continents. Chloranthaceae are fragrant shrubs or herbaceous plants, that only produce side branches on the new growth. The stems are mostly cylindrical, with solid internodes, thickened nodes in many species, that carry evergreen leaves arranged in pairs on opposite sides of the stem, with stipules that have merged with that of the opposing leaf. The small flowers are seated directly on the axis of the inflorescence. Petals are absent in this family, and sometimes so are sepals. The flowers can be either hermaphrodite or of separate sexes. The fruit is a drupe or berry, consisting of one carpel. The four genera assigned to this family can be distinguished from each other by the following characters: Sarcandra species are shrubs whose wood lacks vessels. They have bisexual flowers, with only one, club-shaped, stamen, in which the connective tissue (between the anther lobes which carry the pollen) is wide, and with a smooth and moist stigma. This genus has four species, which occur in Malaysia, China, Indochina, Japan, India, and Sri Lanka. Chloranthus species are dwarf shrubs or herbaceous plants, with xylem that contains vessels. Flowers are bisexual, each of which bears three stamens on straight filaments with three anther lobes and a wide connective, and with a smooth and moist stigma.

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Magnoliids

Magnoliids (or Magnoliidae or Magnolianae) are a clade of flowering plants. With more than 10,000 species, including magnolias, nutmeg, bay laurel, cinnamon, avocado, black pepper, tulip tree and many others, it is the third-largest group of angiosperms after the eudicots and monocots. The group is characterized by trimerous flowers, pollen with one pore, and usually branching-veined leaves. Some members of the subclass are among the earliest angiosperms and share anatomical similarities with gymnosperms like stamens that resemble the male cone scales of conifers and carpels found on the long flowering axis.

Basal angiosperms

The basal angiosperms are the flowering plants which diverged from the lineage leading to most flowering plants. In particular, the most basal angiosperms were called the ANITA grade, which is made up of Amborella (a single species of shrub from New Caledonia), Nymphaeales (water lilies, together with some other aquatic plants) and Austrobaileyales (woody aromatic plants including star anise). ANITA stands for Amborella, Nymphaeales, I lliciales, Trimeniaceae, and Austrobaileya.

Magnoliopsida

Magnoliopsida is a valid botanical name for a class of flowering plants. By definition the class will include the family Magnoliaceae, but its circumscription can otherwise vary, being more inclusive or less inclusive depending upon the classification system being discussed. In the Takhtajan system and the Cronquist system, the name was used for the group known as dicotyledons.

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The water transport pipeline in herbs is assumed to be more vulnerable to drought than in trees due to the formation of frequent embolisms (gas bubbles), which could be removed by the occurrence of root pressure, especially in grasses. Here, we studied hyd ...

Amer Soc Plant Biologists2016

Phytolith types and type-frequencies in subalpine-alpine plant species of the European Alps

Biogenic silica extracted from 21 species commonly occurring in subalpine and alpine plant communities in the central Swiss Alps were examined using light and SEM microscopes; 19 species being screened here for the first time. An inventory of phytolith typ ...

2004