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.
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 long and 25–29 mm broad, with an orange sarcotesta when ripe. The male cones solitary, ovoid, 18–36 cm long and 6.5–12 cm diameter, also covered in orange hairs.
Habitatedit
This cycad, like Cycas arenicola, is common amongst the Eucalyptus woodlands and savanna grasslands. Found only around the Goyder River and the lower Blyth River in Arnhem land, it has a somewhat restricted distribution.
First described in 1994, it is most closely related to Cycas maconochiei. The grass fires that are so beneficial to Cycas armstrongii, seem to do some damage to this species populations. With these grass fires, many seeds are easily killed off, as are seedlings in these ever more common events. However, the conservation status is considered stable due to its inhospitable habitat and healthy number of individuals.
Cycad Pages: Cycas arnhemica 2013-05-10 at the Wayback Machine
March 17, 2024
cycas, arnhemica, species, cycad, genus, cycas, native, australia, northwest, northern, territory, arnhem, land, after, which, named, conservation, statusleast, concern, iucn, scientific, classificationkingdom, plantaeclade, tracheophytesclade, gymnospermaediv. 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 Cycas arnhemicaConservation statusLeast Concern IUCN 3 1 1 Scientific classificationKingdom PlantaeClade TracheophytesClade GymnospermaeDivision CycadophytaClass CycadopsidaOrder CycadalesFamily CycadaceaeGenus CycasSpecies C arnhemicaBinomial nameCycas arnhemicaK D HillThe 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 long and 25 29 mm broad with an orange sarcotesta when ripe The male cones solitary ovoid 18 36 cm long and 6 5 12 cm diameter also covered in orange hairs Habitat editThis cycad like Cycas arenicola is common amongst the Eucalyptus woodlands and savanna grasslands Found only around the Goyder River and the lower Blyth River in Arnhem land it has a somewhat restricted distribution First described in 1994 it is most closely related to Cycas maconochiei The grass fires that are so beneficial to Cycas armstrongii seem to do some damage to this species populations With these grass fires many seeds are easily killed off as are seedlings in these ever more common events However the conservation status is considered stable due to its inhospitable habitat and healthy number of individuals References edit Ottley H 2010 Cycas arnhemica IUCN Red List of Threatened Species 2010 e T42031A10633070 Retrieved 26 June 2022 Cycad Pages Cycas arnhemica Archived 2013 05 10 at the Wayback Machine Retrieved from https en wikipedia org w index php title Cycas arnhemica amp oldid 1192983943, wikipedia, wiki, book, books, library,
