Plant of the Week: Long Lived Welwitschia Plant

It's not pretty to look at, but Namibia's plant Welwitschia Mirabilis can truly claim to be one of a kind. There really is nothing like it. Welwitschia plant consists of only two leaves and a sturdy stem with roots. That's all! Two leaves continue to grow until they resemble the shaggy mane of some sci-fi alien. The stem thickens, rather than gains in height, and can grow to be almost 6 feet high and 24 feet wide. Their estimated lifespan is 400 to 1,500 years. It can survive up to five years with no rain. The plant is said to be very tasty either raw or baked in hot ashes, and this is how it got its other name, Onyanga, which means onion of the desert.

Welwitschia is named after the Slovenian botanist and doctor Friedrich Welwitsch who discovered the plant in 1859 in present-day Angola. Welwitsch was so overwhelmed by the plant that he, "could do nothing but kneel down and gaze at it, half in fear lest a touch should prove it a figment of the imagination." Joseph Dalton Hooker of the Linnean Society of London, using Welwitsch's description and collected material along with material from the artist Thomas Baines who had independently discovered the plant in Namibia, described the species.

Welwitsch proposed calling the genus Tumboa after what he believed to be the local name, tumbo. Hooker asked Welwitsch for permission to name the genus Welwitschia instead. Welwitsch concurred and supplied some well-preserved material from which Hooker was able to make substantial progress in determining its botanical affinities. The taxonomy of Welwitschia subsequently changed intermittently with the development of new classification, however, its current taxonomic status is essentially the same as Hooker's placement.

Most botanists have treated Welwitschia as a distinct monotypic genus in a monotypic family or even order. Most recent systems place Welwitschia mirabilis in its own family Welwitschiaceae in the gymnosperm order Gnetales.

After germination, the seedling produces two cotyledons which grow to 2 inches in length, and possess reticulate venation. Subsequently, two foliage leaves are produced at the edge of a woody bilobed crown. The permanent leaves are opposite (at right angles to the cotyledons), amphistomatic (producing stomata on both sides of the leaf), parallel-veined and ribbon-shaped. Shortly after the appearance of the foliage leaves, the apical meristem dies and meristematic activity is transferred to the periphery of the crown.

The two foliage leaves consequently grow continuously from a basal meristem reaching lengths up to 12 feet. The tips of the leaves split and fray into several well-separated strap-shaped sections by the distortions of the woody portions surrounding the apical slit, and also by wind and adventitious external injuries. The largest specimens may be no more than 4.5 feet tall above ground, but the circumference of the leaves at contact with the sand may exceed 24 feet

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