Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:37Public Records:35
Specimens with Sequences:36Public Species:15
Specimens with Barcodes:36Public BINs:0
Species:15         
Species With Barcodes:15         
          
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Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Stemonaceae

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Barcode data

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Wikipedia

Stemonaceae

Stemonaceae is a family of monocotyledonous flowering plants placed in order Pandanales. The family consists of four genera with between 25-35 species distributed in areas with seasonal climate across Southeast Asia and tropical Australia. There is also one native species in United States.

Description and ecology[edit]

Stemonaceae contains various herbeceous plants, many of which are crawling or climbing species preferring moist or dry tropical habitats.[2] They form underground organs as spindle-shaped rhizomes that are used for reservation of nutritions. There are evergreen species so as plants with shading leaves and stems. The stems are sometimes erect or trailing with green or yellow-green color or in some cases with reddish appearance. Leaves are dark green and also alternate in the majority of the members. Flowers are born in short cymes produced from the lower parts of the plant. Seeds are elipsoid or globular.

Flower morphology[edit]

As in other members of Pandanales the flower morphology in Stemonaceae is distinctively developed and rather atypical for other Monocots.[3] In the majority of the species flowers are tetramerous (composed of four identical parts) or sometimes dimerous.[4] Stamens are distinguishable and four in number. In most of the members tepals are four. They are smooth or sometimes papilate which is probably because they function as odour-producing components (osmophores). However in Pentastemona flowers are pentamerous and the number of stamens is five. Microsporogenesis is successive. Reproductive structures are colored in shades of purple, maroon, green or yellow. They imitate carrion and sometimes release such smell - it is reported that flies are visiting the flowers by functioning as pollinators.

Phylogeny and evolution[edit]



Pentastemona




Stemona




Stichoneuron



Croomia





Stemonaceae is sister to other two families in Pandanales that together form a clade - these are Cyclanthaceae and Pandanaceae. Pentastemona is the genus that diverged first from the family and therefore is a sister clade to the rest of It. Actually, the genus demonstrates characteristics that are rather more different from other members of Stemonaceae.[5] That's why in earlier classifications it was placed in its own family. On the other hand Stemona is sister to the other two genera that together form a clade. The family appears in Late Cretaceous - around 84 Mya although the stem group diverged earlier in the same period - 108 Mya.[6]

Uses[edit]

The family contains plants with various therapeutical and other uses in places like China, Laos, Japan, Thailand and others.[7] Some members are used for making an insecticide. In Laos people are using them against fleas and lice by making an infusion which They drink to make their blood poisonous. Plants from the family are used for the preparation of a fish poison. Others play a role in folk medicine and are valued for their antibacterial, antitussive, antifungal and other properties against lung or skin diseases.

References[edit]

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