Oil Organic Palm
Oil Organic Palm
Arecaceae or Palmae (also known by the name Palmaceae , which is considered taxonomically invalid, or by the common name palm tree ), the palm family, is a family of flowering plants, the only family in the monocot order Arecales . There are roughly 202 currently known genera with around 2600 species, most of which are restricted to tropical, subtropical, and warm temperate climates. Most palms are distinguished by their large, compound, evergreen leaves arranged at the top of an unbranched stem. However, many palms are exceptions to this statement, and palms in fact exhibit an enormous diversity in physical characteristics. As well as being morphologically diverse, palms also inhabit nearly every type of habitat within their range, from rainforests to deserts.
Palms are among the best known and extensively cultivated plant families. They have been important to humans throughout much of history. Many common products and foods are derived from palms, and palms are also widely used in landscaping for their exotic appearance, making them one of the most economically important plants. In many historical cultures, palms were symbols for such ideas as victory, peace, and fertility. Today, palms remain a popular symbol for the tropics and vacations.
Morphology
Shrubs, trees or vines, palms are limited to two methods of growth. The common representation is that of a solitary shoot ending in a crown of leaves. This monopodial behavior may be exhibited by prostrate, trunkless, and trunk-forming members. Some common palms restricted to solitary growth include Washingtonia and Roystonea . Palms may instead grow in sparse to dense clusters. The trunk will develop an axillary bud at a leaf node, usually near the base, from which a new shoot emerges. The new shoot, in turn, produces an axillary bud and a clustering habit results. Exclusively sympodial genera include many of the rattans, Guihaia , and Rhapis . Several palm genera have both solitary and clustering members. Palms which are usually solitary may grow in clusters, and vice versa. These aberrations suggest that the habit operates on a single gene.
They have large evergreen leaves that are either palmately ('fan-leaved') or pinnately ('feather-leaved') compound and spirally arranged at the top of the stem. The leaves have a tubular sheath at the base that usually splits open on one side at maturity. The inflorescence is a panicle or spike surrounded by one or more bracts or spathes that become woody at maturity. The flowers are generally small and white, radially symmetric, and can be either uni- or bi-. The sepals and petals usually number three each and may be distinct or joined at the base. The stamens generally number six, with filaments that may be separate, attached to each other, or attached to the pistil at the base. The fruit is usually a single-seeded drupe, but some genera (e.g. Salacca ) may contain two or more seeds in each fruit.
Arecaceae are notable for being the tallest monocots and for the size of their seeds, leaves, and inflorescences. The Coco de mer ( Lodoicea maldivica ) has the largest seeds of any plant, 40-50 centimeters in diameter and weighing 15–30 kilograms each. Raffia palms ( Raphia spp.), with leaves up to 25 meters long and 3 meters wide, have the largest leaves of any plant. The Corypha species have the largest inflorescence of any plant, up to 7.5 meters tall and containing millions of small flowers. Ceroxylon quindiuense , Colombia's national tree, is the tallest monocot in the world, reaching heights of 60 meters.
Range and habitat
Most palms grow in the tropics. They are abundant throughout the tropics, and thrive in almost every habitat therein. Their diversity is highest in wet, lowland tropical forests, especially in ecological "hotspots" such as Madagascar, which has more endemic palms than all of Africa. Colombia may have the highest number of palm species in one country.
It is estimated that only 130 palm species grow naturally beyond the tropics, mostly in the subtropics. The northernmost native palm is Chamaerops humilis , which reaches 44°N latitude in southern France. The southernmost palm is the Rhopalostylis sapida , which reaches 44°S on the Chatham Islands where an oceanic climate prevails. Some palms, such as the Trachycarpus fortunei, grow well under cultivation as far north as over 50°N in oceanic climates (Ireland, Scotland and coastal British Columbia- Vancouver/ Vancouver Island).
Palms inhabit a variety of ecosystems. More than two thirds of palm species live in tropical forests, where some species grow tall enough to form part of the canopy and shorter ones form part of the understory. Some species form pure stands in areas with poor drainage or regular flooding, including Raphia hookeri which is common in coastal freshwater swamps in West Africa. Other palms live in tropical mountain habitats above 1000 meters, such as those in the genus Ceroxylon native to the Andes. Palms may also live in grasslands and scrublands, usually associated with a water source, and in desert oases such as the Date Palm. A few palms are adapted to extremely basic lime soils, while others are similarly adapted to very acidic serpentine soils.
Taxonomy
Palms are a monophyletic group of plants, meaning that the group consists of a common ancestor and all its descendants. Extensive taxonomic research on palms began with botanist H.E. Moore, who organized palms into fifteen major groups based mostly on general morphological characteristics. The following classification, proposed by N.W. Uhl and J. Dransfield in 1987, is a revision of Moore's classification that organizes palms into six subfamilies. A few general traits of each subfamily are listed.
Coryphoideae is the most diverse subfamily and is a paraphyletic group, meaning that all members of the group share a common ancestor but the group does not include all the ancestor's descendants. Most palms in this subfamily have palmately lobed leaves and solitary flowers with three, sometimes four carpels. The fruit normally develops from only one carpel. Subfamily Calamoideae includes the climbing palms such as rattans. The leaves are usually pinnate; derived characters (synapomorphies) include spines on various organs, organs specialized for climbing, an extension of the main stem of the leaf bearing reflexed spines, and overlapping scales covering the fruit and ovary. Subfamily Nypoideae contains only one genus and one species, Nypa fruticans , which has large pinnate leaves. The fruit is unusual in that it floats, and the stem is dichotomously branched, also unusual in palms. Subfamily Ceroxyloideae has small to medium-sized flowers that spirally arranged, with a gynoecium of three joined carpels. Arecoideae is the largest subfamily with six diverse tribes containing over 100 genera. All tribes have pinnate or bipinnate leaves and flowers arranged in groups of three, with a central pistillate and two staminate flowers. Phytelephantoideae is a monoecious subfamily. Members of this group have distinct monopodial flower clusters. Other distinct features include a gynoecium with five to ten joined carpels, and flowers with more than three parts per whorl. Fruits are multiseeded and have multiple parts.
Currently, few extensive phylogenetic studies of Arecaceae exist. In 1997, Baker et al. explored subfamily and tribe relationships using chloroplast DNA from 60 genera from all subfamilies and tribes. The results strongly showed that Calamoideae is monophyletic, and that Ceroxyloideae and Coryphoideae are paraphyletic. The relationships of Arecoideae are uncertain but it is possibly related to Ceroxyloideae and Phytelephantoideae. Studies have suggested that the lack of a fully resolved hypothesis for the relationships within the family is due to a variety of factors including difficulties in selecting appropriate outgroups, homoplasy in morphological character states, slow rates of molecular evolution important for the use of standard DNA markers, and character polarization. However, hybridization has been observed among Orbignya and Phoenix species, and using chloroplast DNA in cladistic studies may produce inaccurate results due to maternal inheritance of the chloroplast DNA. Chemical and molecular data from non-organelle DNA, for example, could be more effective for studying palm phylogeny.
Selected genera
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Archontophoenix
—Bangalow palm
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