Boronia fraseri
Boronia fraseri, drawing by W. H. Fitch (1844 )
Boronia fraseri is a species of the rue family ( Rutaceae ). This Australian species grows as up to two meters tall shrub with purple flowers in the area of Sydney, where they can be found in wet sclerophyll forests and rainforests. Your small capsule fruits explode if vibration and constantly cast the seeds.
Boronia fraseri was first described in 1843 by William Jackson Hooker and is close within the genus coral diamonds ( Boronia ) the very similar type Boronia keysii. Since Boronia fraseri has a comparatively small area of distribution and is not considered common, they will ( ROTAP ) on the list of Rare and Threatened Australian Plants as rare ( "rare ").
- 5.1 Literature
- 5.2 External links
- 5.3 Notes and references
Description
Appearance
Boronia fraseri grows as a shrub, reaching heights of growth of 0.5 to 2 meters. The tribes already branch out near the ground. The significant four -edged branches have bark that is bare or sparsely covered with stellate hairs.
The decussate angeordeneten on the branches have leaves 2-30 mm long stalks. The unpaired fiederteilige leaf blade has three to seven leaflets on a 6 to 30 mm long, winged Blattrhachis. The leaflets are opposite each other on opposite sides. You are bald and with a length of 10 to 60 mm and a width of 3 to 15 mm, elliptic to broadly elliptical or obovate obtuse upper end. The Endfiederblatt is the longest. The leaf margins are smooth and curved back. Deviating from the description in Bentham, there the Endfiederblatt with a length of 2.5 to 4 centimeters is oblong - lanceolate. The lower leaf surface is brighter than the upper leaf surface.
Inflorescences and flowers
The pendant standing on a short inflorescence stem, zymösen inflorescences contain two to six flowers. The flower stalks are 6 to 16 mm long. The hermaphrodite flowers are cruciform with a double perianth. The four tomentose hairy, free sepals are broad ovoid, relatively short and straight. The four tomentose hairy, free outstretched in cruciform arrangement are bright petals are pink to purple and 6 to 10 mm long; they are also found in the fruits. The petals are have a distinct midrib and the buds cover is valvat, so they touch. The four fertile stamens have anthers with a tiny pointed top end. The four staminodes have bald stamens. The discus is thick. Four carpels stand together to a superior ovaries. The ovary shall possess four chambers externally clearly looming. Each ovary chamber contains two ovules. The style ends in a small, head-shaped scar.
The flowering time is in the spring.
Fruits
The small gap fruit decay in bare part of fruits that contain only usually one, rarely two seeds. The gap fruits explode on concussion and constantly cast the part of fruits.
Chromosome number
The chromosome number is 2n = 32
Distribution and occurrence
Boronia fraseri grows exclusively in the region around Sydney, mainly along the coastal plateau and the southeastern foothills of the Blue Mountains. Proved Boronia fraseri is in the Ku- ring-gai Chase National Park, the Blue Mountains National Park and the Brisbane Water National Park. Another possible occurrence is in the Popran National Park. In the late 20th century deposits were discovered at Wyong, Cessnock, Port Stephens and Karuah, so that the known distribution area also extends northward over the Hawkesbury River.
Streams, rivulets and fall gutters are the preferred locations of Boronia fraseri. As vegetation companies both hardwood deciduous and rain forests come into question. It thrives on soils that have over sandstone, which occurs frequently in the region, developed.
Systematics and Taxonomy
This species was first published in 1842 is invalid under the name Boronia anemonifolia by J. Paxton in Paxton 's Magazine of Botany 9, p 123, Plate. It was not until the publication under the name Boronia fraseri by William Jackson Hooker in 1843 on the board of his 4052 multi-volume work The Botanical Magazine. is considered valid first description. The specific epithet fraseri to Charles Fraser, the first director of the Royal Botanic Gardens in Sydney honor.
Within the genus Boronia Boronia fraseri is in the section Valvatae and there again, in the subsection Fraseriae. His sister species is Boronia keysii of the southwest coast of Queensland.
Threat status
Since Boronia fraseri has an estimated area of distribution of less than 100 km in diameter and is not considered common, they will ( ROTAP ) in the category 2RCA (with a small distribution area in protected areas but rarely significant occurrence) on the list of Rare and Threatened Australian Plants.