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Cycas Arnhemica
''Cycas arnhemica'' is a species of cycad in the genus '' Cycas'', native to Australia, in the northwest of Northern Territory in Arnhem Land, after which it is named. The stems are erect, growing to 1.5-2.5 m tall. The leaves are numerous, flat, 70–160 cm long, pinnate, with 160-260 leaflets; the new young leaves are deep white tomentose at first, becoming bright to dark green, moderately glossy above, the down often persisting on the underside. There are three subspecies: *''Cycas arnhemica'' subsp. ''arnhemica''. Leaflets broad, 5-6.5 mm wide. *''Cycas arnhemica'' subsp. ''muninga''. Leaflets slender, 3.5-5.5 mm wide; seeds over 32 mm wide. *''Cycas arnhemica'' subsp. ''natja''. Leaflets slender, 3.5-5.5 mm wide; seeds under 32 mm wide. The female cones are open, 15–24 cm long, with grey sporophylls and orange hairs, with two to six ovules per sporophyll. Triangular lamina, toothed, with an apical spine. The seeds are 28–32 mm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cycad
Cycads are seed plants that typically have a stout and woody (ligneous) trunk (botany), trunk with a crown (botany), crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, that is, individual plants of a species are either male or female. Cycads vary in size from having trunks only a few centimeters to several meters tall. They typically grow very slowly and live very long. Because of their superficial resemblance, they are sometimes mistaken for Arecaceae, palms or ferns, but they are not closely related to either group. Cycads are gymnosperms (naked-seeded), meaning their fertilization, unfertilized seeds are open to the air to be directly fertilized by pollination, as contrasted with angiosperms, which have enclosed seeds with more complex fertilization arrangements. Cycads have very specialized pollinators, usually a specific species of beetle. Both male and female cycads bear cones (strobilus, strobili), somewhat similar to conife ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cycas Arenicola
''Cycas arenicola'' is a species of cycad in the genus ''Cycas'', native to Australia, in the far north of Northern Territory in the basin of the upper East Alligator River in Arnhem Land. It grows in Eucalyptus woodlands on highly siliceous soils (sandstone derived). They thrive in open situations. The stems reach 1.5 m (rarely 2.5 m) tall, with a diameter of 15–20 cm. The leaves are numerous, 0.9-1.6 m long, pinnate with 180-200 leaflets, glossy bright green above, pubescent beneath with brown pubescence, the leaflets are oriented 60-90 degrees forward without overlapping. The petiole is brown pubescent, 25–35 cm long, armed with spines. The female cones open, with sporophylls 15–20 cm long, grey with orange hairs, each with 4-6 ovules. Margins toothed, with bright orange sarcotesta when ripened. The male cones are solitary, spindle shaped, 25 cm long and 9 cm diameter. The name derives from Latin ''arena'' and ''-cola'', "sand dweller", the sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cycadophyta Of Australia
Cycads are seed plants that typically have a stout and woody (ligneous) trunk with a crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, that is, individual plants of a species are either male or female. Cycads vary in size from having trunks only a few centimeters to several meters tall. They typically grow very slowly and live very long. Because of their superficial resemblance, they are sometimes mistaken for palms or ferns, but they are not closely related to either group. Cycads are gymnosperms (naked-seeded), meaning their unfertilized seeds are open to the air to be directly fertilized by pollination, as contrasted with angiosperms, which have enclosed seeds with more complex fertilization arrangements. Cycads have very specialized pollinators, usually a specific species of beetle. Both male and female cycads bear cones (strobili), somewhat similar to conifer cones. Cycads have been reported to fix nitrogen in associatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flora Of The Northern Territory
''FloraNT'' is a public access web-based database of the Flora of the Northern Territory of Australia. It provides authoritative scientific information on some 4300 native taxa, including descriptions, maps, images, conservation status, nomenclatural details together with names used by various aboriginal groups. Alien taxa (over 470 species)Flora NT: Introduced species Retrieved 20 November 2018 are also recorded. Users can access fact sheets on species and some details of the specimens held in the Northern Territory Herbarium, (herbaria codes, NT, DNA) together with keys, and some regional factsheets. In the distribution guides FloraNT uses the IBRA version 5.1 botanical regions. The conserv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cycas Armstrongii
''Cycas armstrongii'' is a species of cycad in the genus ''Cycas'', endemic to Northern Territory of Australia. It is found from the Finniss River in the west to the Arnhem Highway in the east, north of Pine Creek. It also occurs on the Tiwi Islands and the Cobourg Peninsula The stems reach 3 m (rarely 6 m) tall, with a diameter of 5–11 cm. The leaves are (very unusually for a cycad) deciduous in the dry season (though persistent if grown in moister situations), 55–90 cm long, slightly keeled or flat, pinnate with 100-220 leaflets; the leaflets densely orange-pubescent at first, then glossy bright green above, light green below, 5.5–14 cm long and 4.5–8 mm wide, angled forward at 40 degrees. Mature plants have around 50 leaves in the crown. The female cones open, with 13–22 cm long sporophylls with 2-4 ovules per sporophyll on a lanceolate triangular lamina with an apical spine. The sarcotesta has a yellow coating when ripe. The mal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cycas Maconochiei
''Cycas maconochiei'' is a species of cycad, endemic to Australia's Northern Territory The Northern Territory (commonly abbreviated as NT; formally the Northern Territory of Australia) is an states and territories of Australia, Australian territory in the central and central northern regions of Australia. The Northern Territory .... This species has three subspecies ''C. maconochiei ''ssp. ''maconochiei'', ''C. maconochiei''ssp. ''lanata'' and ''C. maconochiei'' ssp. ''viridis.'' References maconochiei Flora of the Northern Territory {{cycad-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blyth River (Northern Territory)
The Blyth River is a river in the Northern Territory, Australia. Course and features The headwaters rise east of Shadforth Hills and flows in a northerly direction through mostly uninhabited country, past the small community of Gamardi before discharging into Boucaut Bay. The catchment occupies an area of and is situated between the Liverpool River catchment to the west, the Goyder River catchment to the east and the Roper River catchment to the south. It has a mean annual outflow of , The Cadell and Blyth Floodplains are located at the lower reaches of the river and occupy an area of . The estuary formed at the river mouth is tidal in nature and in near pristine condition. History The river was named by Francis Cadell in 1867 after the Premier of South Australia, Arthur Blyth. David Lindsay charted the river in 1883 during his expedition of Arnhem Land. Fauna Many species of fish are found in the river including Sailfin Glassfish, Macleay's Glassfish, Barred Grunter, F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goyder River
The Goyder River is a river in the Northern Territory, Australia. Description The headwaters of the river rise at the base of the Mitchell Ranges and are fed by spring discharge from an extensive dolomite aquifer that supports areas of rainforest along the banks. The river then flows north west before crossing the Central Arnhem Road then veering north and later forming multiple braided channels and feeding the Arafura Swamp before eventually discharging into the Glyde River which in turn empties into Castlereagh Bay and the Arafura Sea. The swamp area occupies an area of in the dry season and is of great cultural significance to the Yolngu people, in particular the Ramingining community which is located on the edge of the swamp.Australian Nature Conservation Agency. (1996). ''A Directory of Important Wetlands in Australia (Second Edition)''. ANCA: Canberra. pp. 154–155. The river catchment occupies an area of and is wedged between the Blyth River catchment ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eucalyptus
''Eucalyptus'' () is a genus of over seven hundred species of flowering trees, shrubs or mallees in the myrtle family, Myrtaceae. Along with several other genera in the tribe Eucalypteae, including '' Corymbia'', they are commonly known as eucalypts. Plants in the genus ''Eucalyptus'' have bark that is either smooth, fibrous, hard or stringy, leaves with oil glands, and sepals and petals that are fused to form a "cap" or operculum over the stamens. The fruit is a woody capsule commonly referred to as a "gumnut". Most species of ''Eucalyptus'' are native to Australia, and every state and territory has representative species. About three-quarters of Australian forests are eucalypt forests. Wildfire is a feature of the Australian landscape and many eucalypt species are adapted to fire, and resprout after fire or have seeds which survive fire. A few species are native to islands north of Australia and a smaller number are only found outside the continent. Eucalypts have been grow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sarcotesta
The sarcotesta is a fleshy seedcoat, a type of testa. Examples of seeds with a sarcotesta are pomegranate and some cycad seeds. The sarcotesta of pomegranate seeds consists of epidermal cells derived from the integument, and there are no aril An aril (pronounced ), also called an arillus, is a specialized outgrowth from a seed that partly or completely covers the seed. An arillode or false aril is sometimes distinguished: whereas an aril grows from the attachment point of the see ...s on these seeds. References External links * Fruit morphology Plant anatomy {{Botany-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cycas
''Cycas'' is a genus of plants belonging to a very ancient lineage, the Cycadophyta, which are not closely related to palms, ferns, trees or any other modern group of plants. They are evergreen perennials which achieved their maximum diversity in the Jurassic and Cretaceous periods, when they were distributed almost worldwide. At the end of the Cretaceous, when the non-avian dinosaurs became extinct, so did most of the cycas in the Northern Hemisphere. ''Cycas'' is the type genus and the only extant genus recognised in the family Cycadaceae. About 113 species are accepted. ''Cycas circinalis'', a species endemic to India, was the first cycad species to be described in western literature, and was the type of the generic name, ''Cycas''. The best-known ''Cycas'' species is ''Cycas revoluta''. Range The genus is native to the Old World, with the species concentrated around the equatorial regions - eastern and southeastern Asia including the Philippines with 10 species (9 of which ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaf
A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, flower, and fruit collectively form the shoot system. In most leaves, the primary photosynthetic tissue is the palisade mesophyll and is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of ''Eucalyptus'', palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves are flattened and have distinct upper (adaxial) and lower ( abaxial) surfaces that differ in color, hairiness, the number of stomata (pores that intake and output gases), the amount and structure of epicuticular wax and other features. Leaves are mostly green in color due to the presence of a compound called chlorophyll that is essential for photosynthesis as it absorbs light ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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