Of the two plants, Dictyosperma and Lepidozamia, which has been farmed to extinction in its native climates
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Lepidozamia Lepidozamia is a genus of two species of cycad, both endemic to Australia. The name, derived from the Greek word lepidos, meaning scaly, refers to the scale-like structure of the stem and leaf bases. They are native to rainforest climates in eastern Queensland and eastern New South Wales. They have a chromosome number of 2n = 18.
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Dictyosperma Dictyosperma is a monotypic genus of flowering plant in the palm family found in the Mascarene Islands in the Indian Ocean (Mauritius, Réunion and Rodrigues). The sole species, Dictyosperma album, is widely cultivated in the tropics but has been farmed to near extinction in its native habitat. It is commonly called princess palm or hurricane palm, the latter owing to its ability to withstand strong winds by easily shedding leaves. It is closely related to, and resembles, palms in the "Archontophoenix" genus. The genus is named from two Greek words meaning "net" and "seed" and the epithet is Latin for "white", the common color of the crownshaft at the top of the trunk.
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Desert A desert is a barren area of landscape where little precipitation occurs and consequently living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of denudation. About one third of the land surface of the world is arid or semi-arid. This includes much of the polar regions where little precipitation occurs and which are sometimes called polar deserts or "cold deserts". Deserts can be classified by the amount of precipitation that falls, by the temperature that prevails, by the causes of desertification or by their geographical location.
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Dimethyl tetrachloroterephthalate Dimethyl tetrachloroterephthalate (DCPA, Dacthal) is an organic compound with the formula CCl(COCH). It is a colourless solid, although commercial samples can be off white. DCPA is the dimethyl ester of tetrachloroterephthalic acid. It is used as a preemergent herbicide. It kills grass and many common weeds without killing sensitive plants such as flowers, fruits, vegetables, turf, and cotton. DCPA was first registered for use in the United States in 1958. Production of DCPA was eventually discontinued by ISK Biosciences in 1998, but the large manufacturing company AMVAC began producing the product in 2001 for use in America. Sigma-Aldrich also manufactures DCPA for use in the USA under the name Pestanal. In Australia, DCPA is the active ingredient in agchem company Farmalinx's herbicide called Dynamo 750. Currently, DCPA is only used for eggplant, kale, turnips, and sweet potatoes.
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Habitat destruction Habitat destruction is the process in which natural habitat is rendered unable to support the species present. In this process, the organisms that previously used the site are displaced or destroyed, reducing biodiversity. Habitat destruction by human activity is mainly for the purpose of harvesting natural resources for industry production and urbanization. Clearing habitats for agriculture is the principal cause of habitat destruction. Other important causes of habitat destruction include mining, logging, trawling and urban sprawl. Habitat destruction is currently ranked as the primary cause of species extinction worldwide. It is a process of natural environmental change that may be caused by habitat fragmentation, geological processes, climate change or by human activities such as the introduction of invasive species, ecosystem nutrient depletion, and other human activities.
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Leucaena Leucaena is a genus of flowering plants in the mimosoid clade of the subfamily Caesalpinioideae of the legume family Fabaceae. It contains about 24 species of trees and shrubs, which are commonly known as leadtrees. They are native to the Americas, ranging from Texas in the United States south to Peru. The generic name is derived from the Greek word λευκός ("leukos"), meaning "white," referring to the flowers.
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Lactuca dissecta Lactuca dissecta (split-leaf lettuce) is an Asian species of plant in the dandelion tribe within the sunflower family. It is native to Central Asia, western China (Xinjiang, Tibet), the Himalayas, and southwest Asia as far west as Turkey.
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Dioscorea rosei Dioscorea rosei is a vine in the Dioscoreaceae family. It is endemic to Ecuador and it is threatened by habitat destruction.
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Disporopsis Disporopsis is a genus of plants in the Agavoideae. It is native to China, Indochina and the Philippines.
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Lesser Antillean iguana The Lesser Antillean iguana ("Iguana delicatissima") is a large arboreal lizard endemic to the Lesser Antilles. It is one of two species of lizard of the genus "Iguana" and is in severe decline due to habitat destruction, feral predators, hunting, and hybridization with its sister species, the green iguana. Successful captive breeding of this species has been limited to only two instances as most captive laid eggs tend to be infertile.
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Bomarea elegans Bomarea elegans is a species of flowering plant in the family Alstroemeriaceae. It is endemic to Ecuador, where it occurs in the forests and páramo of the Andes. It is threatened by fire, grazing, and mining.
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Lepidium Lepidium is a genus of plants in the mustard/cabbage family, Brassicaceae. The genus is widely distributed in the Americas, Africa, Asia, Europe, and Australia. It includes familiar species such as garden cress, maca, and dittander. General common names include peppercress, peppergrass, and pepperwort. Some species form tumbleweeds.
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Bush encroachment in Namibia Bush encroachment is a natural phenomenon characterised by the excessive expansion of bush at the expense of other plant species, especially grasses. Bush encroachment is estimated to affect up to 45 million ha of Namibian land and has severe negative consequences on key Ecosystem services, especially agricultural productivity and groundwater recharge. Agricultural productivity in Namibia has declined by two thirds throughout the past decades, mainly due to the negative impact of bush encroachment. The phenomenon affects both commercial and communal farming in Namibia, mostly the central, eastern and north-eastern regions.
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Centropogon dissectus Centropogon dissectus is a species of plant in the Campanulaceae family. It is endemic to Ecuador. Its natural habitat is subtropical or tropical moist montane forests. It is threatened by habitat loss.
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Dactyladenia dichotoma Dactyladenia dichotoma is a species of plant in the Chrysobalanaceae family. It is endemic to Nigeria. It is threatened by habitat loss.
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Dithyrea Dithyrea (shieldpod) is a small genus of flowering plants in the mustard family containing only one or two species. The California shieldpod or spectacle-pod, "Dithyrea californica", is an abundant and unique-looking herb native to the southwestern United States and northern Mexico. The beach shieldpod, "Dithyrea maritima", a rare plant found only on the coast of California and Baja California, is sometimes considered a subspecies of "D. californica".
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Beta vulgaris Beta vulgaris (beet) is a plant which is included in Betoideae subfamily in the Amaranthaceae family. It is the economically most important crop of the large order Caryophyllales. It has several cultivar groups, the sugar beet, of greatest importance to produce table sugar; the root vegetable known as the beetroot or garden beet; the leaf vegetables chard and spinach beet; and mangelwurzel, which is a fodder crop. Three subspecies are typically recognised. All cultivars fall into the subspecies "Beta vulgaris" subsp. "vulgaris". The wild ancestor of the cultivated beets is the sea beet ("Beta vulgaris" subsp. "maritima").
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Lamiaceae or Labiatae is a family of flowering plants commonly known as the mint or deadnettle family. Many of the plants are aromatic in all parts and include widely used culinary herbs, such as basil, mint, rosemary, sage, savory, marjoram, oregano, hyssop, thyme, lavender, and perilla. Some species are shrubs, trees (such as teak), or, rarely, vines. Many members of the family are widely cultivated, not only for their aromatic qualities but also their ease of cultivation, since they are readily propagated by stem cuttings. Besides those grown for their edible leaves, some are grown for decorative foliage, such as "Coleus". Others are grown for seed, such as "Salvia hispanica" (chia), or for their edible tubers, such as "Plectranthus edulis", "Plectranthus esculentus", "Plectranthus rotundifolius", and "Stachys affinis" (Chinese artichoke).
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Pimelea linifolia Pimelea linifolia is an Australian shrub, variously known as queen-of-the-bush and the slender or flax-leafed riceflower. It is widespread throughout the south and east of the continent and is toxic to livestock.
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Silybum Silybum (milk thistle) is a genus of two species of thistles in the (daisy family). The plants are native to the Mediterranean regions of Europe, North Africa, and the Middle East. One species has been introduced elsewhere, including in North America. The name "milk thistle" derives from a feature of the leaves, which are prominently banded with splashes of white. Historically, these milky bands were said to be Mother Mary's milk, and this is the origin of another common name, St. Mary's thistle. The most widespread species is "Silybum marianum".
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Dioscorea cayennensis subsp. rotundata Dioscorea cayennensis" subsp. "rotundata, the "white yam", sometimes sold as "Guinea yam" or "white ñame", is a subspecies of yam native to Africa. It is one of the most important cultivated yams.
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Dioscorea pentaphylla Dioscorea pentaphylla is a species of flowering plant in the yam family known by the common name fiveleaf yam. It is native to southern and eastern Asia (China, India, Indochina, Indonesia, Philippines, etc.) as well as New Guinea and northern Australia. It is widely cultivated as a food crop and naturalized in Cuba and on several island chains in the Pacific (including Hawaii).