Idiospermum australiense, the sole species in the genus Idiospermum, is one of the most primitive flowering plants known, having lived in the Daintree Rainforest of Queensland, Australia for 120 million years. It is only found in very few locations of the Daintree Rainforest in the very wet lowland parts of the forest, where it grows in groups of 10-100 trees together (rather than scattered individuals). Common names include Ribbonwood and Idiot Fruit. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Divisions Land plants (embryophytes) Non-vascular plants (bryophytes) Hepatophyta - liverworts Anthocerophyta - hornworts Bryophyta - mosses Vascular plants (tracheophytes) Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - true ferns Psilotophyta - whisk ferns Ophioglossophyta - adderstongues Seed plants (spermatophytes) †Pteridospermatophyta - seed ferns Pinophyta - conifers Cycadophyta - cycads Ginkgophyta - ginkgo Gnetophyta - gnetae Magnoliophyta - flowering plants Adiantum pedatum (a fern... Classes Magnoliopsida - Dicots Liliopsida - Monocots The flowering plants (also angiosperms or Magnoliophyta) are one of the major groups of modern plants, comprising those that produce seeds in specialized reproductive organs called flowers, where the ovulary or carpel is enclosed. ... Orders see text Dicotyledons or dicots are flowering plants whose seed contains two embryonic leaves or cotyledons. ... Families Atherospermataceae Calycanthaceae Gomortegaceae Hernandiaceae Lauraceae Monimiaceae Siparunaceae The Laurales are an order of flowering plants. ... Genera Calycanthus Chimonanthus Idiospermum Sinocalycanthus The Calycanthaceae (sweetshrub or spicebush family) is a small family of flowering plants included in the order Laurales. ... In biology, binomial nomenclature is a standard convention used for naming species. ... Classes Magnoliopsida - Dicots Liliopsida - Monocots The flowering plants (also angiosperms or Magnoliophyta) are one of the major groups of modern plants, comprising those that produce seeds in specialized reproductive organs called flowers, where the ovulary or carpel is enclosed. ... Daintree Rainforest is a rainforest near Daintree, Queensland in Australia, named after Richard Daintree. ... Motto: Audax at Fidelis (Bold but Faithful) Nickname: Sunshine State/Smart State Other Australian states and territories Capital Brisbane Government Governor Premier Const. ...

It is an evergreen tree, growing to 20-30 m tall. The leaves are produced singly, in pairs or in whorls of 3-4; the leaf is simple, 12-25 cm long and 5-9 cm broad. The flowers are 4-5 cm diameter, with spirally arranged red tepals. The fruit is a brittle globular nut-like seed around 8 cm in diameter, which splits into three or four segments once fallen; it is very toxic, with symptoms (in cattle) similar to strychnine. A Silver Fir shoot showing three successive years of retained leaves In botany, an evergreen plant is a plant which retains its leaves year-round, with each leaf persisting for more than 12 months. ... The coniferous Coast Redwood, the tallest tree species on earth A tree can be defined as a large, perennial, woody plant. ... In botany, a leaf is an above-ground plant organ specialized for photosynthesis. ... Wildflowers A flower is the reproductive organ of those plants classified as angiosperms (flowering plants; Division Magnoliophyta). ... A magnolia flower showing the petal-like white tepals In a general sense, a tepal is any member or segment of the perianth of a flower, such as a petal or sepal, usually used when all are of similar shape and color (that is, undifferentiated). ... Fruit stall in Barcelona, Spain. ... Hazelnuts from the Common Hazel Image:Walnuts. ... A seed is the ripened ovule of gymnosperm or angiosperm plants. ... Binomial name Bos taurus Linnaeus, 1758 Cattle are domesticated ungulates, a member of the subfamily Bovinae of the family Bovidae. ... Strychnine (pronounced (British) or (U.S.)) is a very toxic (LD50 = 1 mg/kg), colourless crystalline alkaloid used as a pesticide, particularly for killing small vertebrates such as rodents. ...

Most plants have both male and female sex organs, but half of the flowers of the Ribbonwood do not obtain any female sex organs, the species using the process of cross-pollination. Attracted by the colour and smell of the flower, tiny beetles and thirps crawl in and lay their eggs within the center of the flower, which contains the flower's pollen. Within the flower some of the sticky pollen gets trapped on the insect's bodies, and if the next flower they visit is a receptive one, it will pollinate and produce the seeds. Cross pollination is a form of pollination in which pollen from one plant pollinates another. ...

While other modern flowering plants produce seeds which have one cotyledon (monocotyledons) or two (dicotyledons), the seedlings of the Ribbonwood have between three or four cotyledons. Also the Ribbonwood can produce more than one shoot per seed, while the seeds in all other plant species will develop and send up a single shoot. This seedling germinated producing two plain-looking cotyledons later followed by two normal-looking leaves that are small copies of the adult leaves. ... Orders Base Monocots: Acorus Alismatales Asparagales Dioscoreales Liliales Pandanales Family Petrosaviaceae Commelinids: Arecales Commelinales Poales Zingiberales Family Dasypogonaceae Monocotyledons or monocots are a group of flowering plants usually ranked as a class and once called the Monocotyledoneae. ... Orders see text Dicotyledons or dicots are flowering plants whose seed contains two embryonic leaves or cotyledons. ...

The seeds are currently mainly spread through gravity dispersal, the seeds rolling down the steep mountain slopes to find their new home. The seeds are so toxic that most animals cannot eat them, except it is known that the native Musky Rat-kangaroo does disperse and bury some of these seeds this is because they can cope with small amount of the poisonous seeds. It has been suggested that the seeds were formerly dispersed by the now-extinct Diprotodon, on the basis that many Australian marsupials are adapted to cope with the toxins in Australian plants. Species Diprotodon opatum Diprotodon minor Diprotodon loderi Diprotodon annextans Diprotodons were the largest marsupials that ever lived. ...

The plants have adapted also in the poison (chemical called Idiospermuline) that are contained within the seed, to prevent animals eating them. Researchers discovered the poison affects transmission of messages between individual nerve cells, which may cause seizures. In small doses this chemical can be used to save lives.

Discovery

First found by timber cutters south of Cairns in the late 1800s, the Ribbonwood was then brought to the attention of the German botanist Ludwig Diels, who described the species in the genus Calycanthus as C. australiense in 1902, a remarkable disjunction for this otherwise North American genus. It was later believed to be extinct, because when Diels finally returned to the location where this tree was found, it was too late, the spot had been cleared for a sugar cane farm (one of the principal commercial crops of north Queensland). Cairns is a regional city located in far north Queensland, Australia. ... Species Calycanthus (sweetshrub, spicebush or strawberry-bush) is a genus of flowering plants in the family Calycanthaceae, endemic to North America. ... World map showing location of North America A satellite composite image of North America North America is a continent in the northern hemisphere, bounded on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on the west... In biology and ecology, extinction is the ceasing of existence of a species or group of species. ... Species Ref: ITIS 42058 as of 2004-05-05 Sugarcane is one of six species of a tall tropical southeast Asian grass (Family Poaceae) having stout fibrous jointed stalks whose sap at one time was the primary source of sugar. ...

The species was rediscovered in 1971, after the poisonous seeds of the plant were found in the stomachs of dying cattle in the region. In 1972, the Australian botanist T. S. Blake reassigned it to the new family Idiospermaceae and the genus Idiospermum (idio-, "unusual", and spermum, "seed"). In its 2003 revision, the Angiosperm Phylogeny Group retained it in the new genus, but restored the species to the family Calycanthaceae. The skull and crossbones symbol traditionally used to label a poisonous substance. ... Botany is the scientific study of plant life. ... In biology, a genus (plural genera) is a grouping in the classification of living organisms having one or more related and morphologically similar species. ... The Angiosperm Phylogeny Group is an international group of systematic botanists who have come together to try to establish a consensus view of the taxonomy of flowering plants in the light of the rapid rise of molecular systematics. ... Genera Calycanthus Chimonanthus Idiospermum Sinocalycanthus The Calycanthaceae (sweetshrub or spicebush family) is a small family of flowering plants included in the order Laurales. ...

External links

• The families of flowering plants: Descriptions, illustrations, identification, information retrieval by L. Watson and M. J. Dallwitz
• The story of the rediscovery of Idiospermum by Prue Hewett
• An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II by the Angiosperm Phylogeny Group