Dienstag, 4. Oktober 2011

Plant of the Day (October 4th, 2011) - Oenothera glazioviana Micheli.

This time, I want to give you an basic overlook about the species Oenothera glazioviana Micheli from the Onagraceae (Willoherbs) family. The common English name of this plant is “Large flowered evening Primrose” or “redsepal evening primrose”, while in German, this plant is known as “Rotkelchige Nachtkerze”.

O. glazioviana - habitus

It's a herb, that can reach heights until 1,8 metres (5.9 feet), but it's often smaller (between 1 metre or 3.3 feet). Stem and floral axis are covered with many small hairs. Each hair has a bulbous, red base, so the plant seems to be speckled red. The alternate leaves are elliptical and are sitting directly at the stem. They're a little bit humpy.

The inflorescence is a single, terminal raceme. The flowers are very big. The sepals are fused together to a long tube at their base and have long, red tips, while the large petals are yellow and between 40 and 50 Millimetres long. As with all species from the Onogaraceae, one “level” of flowers blooms per night, from the bottom to the top of the floral-axis.

O. glazioviana - flowers (here
you can see the red tip on the
 back of the flower tube)

This plant is native to Europe, but it is a hybrid between the two North American species Oenothera elata Kunth. and Oenothera biennis L. Both plants were planted in European gardens and interbreed to form this new species, which became wild. It grows on nutrient-rich soils and can be found on roadsides, ruderal wastelands or slopes. It can easily be identified by its large flowers with the red speckled sepals.

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