Angophora exul

Angophora exul
Systematics
Order :	Myrtle-like (Myrtales)
Family :	Myrtle family (Myrtaceae)
Subfamily :	Myrtoideae
Tribe :	Eucalypteae
Genre :	Angophora
Type :	Angophora exul
Scientific name
	Angophora exul
	KDHill

Angophora exul is a species ofthe myrtle family (Myrtaceae). It occurs only in one location in the north of the New England table country in New South Wales and is called there “Gibraltar Rock Apple”.

description

Appearance and leaf

Angophora exul grows as a tree that reaches heights of up to 8 meters. The bark remains on the entire tree, is gray or pale brown and has short fibers. It peels off flaky.

In Angophora exul , heterophylly is present. The simple leaves are always opposite to each other on the branches. The sitting leaves on young specimens have stiff, simple hair and bristly glandular hairs ( trichomes ). On medium-aged specimens, the leaves are straight, entire and dull green. The leaves on adult specimens are divided into petiole and leaf blade. Your petiole is 7 to 12 mm long. Their simple, bare leaf blade is linear to narrow-lanceolate with a length of 5 to 12 cm and a width of 0.4 to 0.7 cm with a more or less pointed base and a pointed upper end. The top and bottom of the leaf are colored differently. The lateral nerves depart from the median nerve at close intervals at an obtuse angle. The cotyledons ( cotyledons ) are almost circular.

Inflorescence and flower

At the end of a 6 to 11 mm long, stiffly haired inflorescence stem, there are several partial inflorescences in combined total inflorescences . The stiffly hairy pedicel is 4 to 11 mm long. The flower buds are spherical with a length and a diameter of 6 to 9 mm each. The hermaphrodite flowers are creamy white. The four sepals are reduced to four calyx teeth on the ribbed flower cup (hypanthium)

Fruit and seeds

The stalked fruit is cup-shaped with a length of 5 to 8 mm and a diameter of 5 to 7 mm. The disc is flat and covered or even depressed by the edge of the flower cup. The kneecap-shaped seeds are regular and flattened, smooth and silk-matt red.

Occurrence and endangerment

Angophora exul is rare and is only known from a small location on a scree slope on a mountain ridge with acidic, volcanic outcrop on Gibraltar Rock, west of Tenterfield in the "Northern Tablelands" in New South Wales.

Angophora exul is classified as “endangered” by the “New South Wales Government”. The only location is not in a nature reserve and there is no conservation management for Angophora exul . The danger of extinction is considered high due to the low number of populations. Since Angophora exul forms hybrids with Angophora floribunda , it could become extinct as a result.

Taxonomy

The first description of Angophora exul was in 1997 by Kenneth D. Hill under the title New species in Angophora and Eucalyptus (Myrtaceae) from New South Wales in Telopea , Volume 7 (2), p. 100. The type material was published on February 22, 1996 KD Hill et al. collected and deposited with the collective number 4788 at MO = " Missouri Botanical Garden Herbarium" in St. Louis; it is labeled New South Wales: North Western Slopes: Gibraltar Rock, W of Tenterfield, KD Hill 4788, LC Stanberg & KL Wilson, Feb 22, 1997 (holo NSW; iso: AD, BRI, CANB, K, MEL, MO, NY, P) .

According to R. Govaerts et al. 2008 Eucalyptus exul (KDHill) Brooker and Angophora bakeri C.C.Hall subsp. bakeri synonyms for Angophora exul K.D.Hill . After Apni 2006 Angophora exul K.D.Hill a synonym of Eucalyptus exul (KDHill) Brooker and Angophora bakeri C.C.Hall subsp. bakeri .

Angophora exul forms intergradations with Angophora floribunda .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ K. Hill: Angophora exul (KDHill) at New South Wales Flora Online . National Herbarium of NSW, Royal Botanic Garden, Sydney. Last accessed on February 7, 2013
↑ ^a ^b ^c Gibraltar Rock Apple - profiles in Threatened species . Environment & Heritage. NSW Government - 1999 data. Last accessed February 7, 2013
↑ ^a ^b ^c ^d ^e ^f ^g ^h Angophora exul at EucaLink - A Web Guide to the Eucalypts . Last accessed on February 7, 2013.
↑ ^a ^b APNI = Australian Plant Name Index . Center for Plant Biodiversity Research. Australian Government - 2006 data. Last accessed February 7, 2013
↑ Entry in Tropicos . Last accessed on February 7, 2013
↑ ^a ^b Rafaël Govaerts (Ed.): Angophora exul. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved February 7, 2013.

[NSWFo-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ K. Hill: Angophora exul (KDHill) at New South Wales Flora Online . National Herbarium of NSW, Royal Botanic Garden, Sydney. Last accessed on February 7, 2013

[TS-2] Gibraltar Rock Apple - profiles in Threatened species . Environment & Heritage. NSW Government - 1999 data. Last accessed February 7, 2013

[EucaLink-3] ↑ ^a ^b ^c ^d ^e ^f ^g ^h Angophora exul at EucaLink - A Web Guide to the Eucalypts . Last accessed on February 7, 2013.

[APNI-4] APNI = Australian Plant Name Index . Center for Plant Biodiversity Research. Australian Government - 2006 data. Last accessed February 7, 2013

[tropicos-5] Entry in Tropicos . Last accessed on February 7, 2013

[WCSP-6] Rafaël Govaerts (Ed.): Angophora exul. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved February 7, 2013.