Arabidella

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Arabidella
Systematics
Rosids
Eurosiden II
Order : Cruciferous (Brassicales)
Family : Cruciferous vegetables (Brassicaceae)
Tribe : Microlepidieae
Genre : Arabidella
Scientific name
Arabidella
( F.Muell. ) OESchulz

Arabidella is a small genus of plants inthe cruciferous family (Brassicaceae). All seven species occur only in Australia .

description

Habit and leaves

The Arabidella species grow as shrubs or herbaceous and in this case annual plants . They reach heights of between 15 and 100 centimeters. At most, there is simple hair . The stems , which are round or square in cross-section, have strong internodes .

The leaves are either arranged alternately and spirally distributed on the stem or arranged in basal rosettes and also on the stem. The small to medium-sized leaves are stalked or sessile , have no leaf sheath and the leaf cross-section is not rolled . They can be foul smelling, but also without a noticeable odor. The leaf blade is divided or simple . If the leaf blade is divided, then it is pinnate or divided several times. There is only one leaf vein or there is pinnate vein . There are no stipules .

Inflorescence and flower

The flowers are grouped in umbrella or racemose , loose to dense inflorescences . If the inflorescences are branched, then the top inflorescence is racemose. There are no bracts and bracts , but there is a flower stalk .

The hermaphroditic flowers are radial symmetry and four-fold with a double flower envelope (perianth). There are four sepals . The four free, yellow or white petals are nailed.

There are six exclusively fertile stamens that are more or less similar, but two of which are shorter than the others. The free stamens have no appendages. The dust bag (anther) are applied basifix (they sit directly on the filament on) and non Versatil (they are by the attachment of dust thread near the middle less capable of movement) design. They can have appendages and consist of four pollen sacs (tetrasporangiat). The pollen ( pollen ) consists of individual grains. The flower base can form a long gynophore with the pistil . There is a discus. Two carpels are a top permanent ovary fused; it is actually two-chambered, but further subdivided by false partitions (septa). The stylus located apically on the ovary ends in a one- or two-lobed or cephalic scar (stigma). In each of the two ovary chambers there are rarely one to, usually three to fifty ovules with anatropic orientation in parietal placentation .

Fruit and seeds

It forms 4 to 33 millimeters long, non-fleshy pods that are compressed on both sides and have two flaps that pop open when ripe. They are equipped with one or two rows of seeds per fruit compartment.

The small to medium-sized seeds have a slimy surface with fine warty elevations. They can be compressed on the sides and winged. An endosperm is rarely formed. The well-formed embryo is curved.

ingredients

The mustard oil glycosides typical of the cruciferous family are also present in this genus.

Occurrence

The Arabidella species colonize moderately humid to extremely dry locations with an arid climate exclusively in Australia .

Systematics

The genus Arabidella was established in 1924 by Otto Eugen Schulz in Das Pflanzenreich , IV. 105 (booklet 86): 177. Synonyms for Arabidella (F.Muell.) OESchulz are: Lemphoria O.E.Schulz , Micromystria O.E.Schulz , Pseudarabidella O.E.Schulz . The genus Arabidella belonged to the tribe Camelineae and has belonged to the tribe Microlepidieae within the family Brassicaceae since 2012 .

Regarding the etymology of Arabidella , it can be said that the root of the word comes from the genus Arabis and the appendage stands for a diminutive; Arabidella thus shows the small size of the genus in comparison with Arabis .

There are seven types of Arabidella :

swell

  • J. Gathe: Arabidella (F. Muell.) OESchulz. Scientific Description. In: FloraBase / the Western Australian Flora. Department of Environment and Conservation / Western Australian Herbarium, accessed November 27, 2010 .
  • Juliet A. Wegen and Brendan J. Lepschi: A new species of Arabidella (Brassicaceae) from Western Australia . Chapter Introduction + Key to the species of Arabidella. In: Western Australian Herbarium Department of Environment and Conservation and Australian National Herbarium, Center for Plant Biodiversity Research, Canberra (Ed.): Nuytsia . tape 17 , 2007, p. 453 to 458 ( online in Mendeley [accessed October 30, 2011] with newly described species Arabidella chrysodema ).

Individual evidence

  1. ↑ Terezie Mandáková, Simon Jolyb, Martin Krzywinskic, Klaus Mumme Hoffd and Martin A. Lysaka: Fast Diploidization in Close Mesopolyploid Relatives of Arabidopsis . Ed .: The Plant Cell. tape 22 , no. 7 , 2010, Supplemental Text 1. Phylogenetic Relationships and Comparison with Previous Studies., P. 2288 , doi : 10.1105 / tpc.110.074526 (English, 813.45 kB Chapter online: Supplemental Data. Mandáková et al .: Phylogenetic relationships and comparison with previous studies [PDF; accessed October 30, 2011]).
  2. ↑ gni Global Names Index. Arabidella (F.Muell.) OESchulz. Retrieved September 8, 2010 .

Web links