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Metarungia pubinervia; Red
Sunbird Bush; Rooisuikerbekkiebos Article by Geoff
Nichols
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You can imagine my excitement
in early April 2000 when a friend by the name of David Styles phoned me to
say he had a specimen of a plant that he had never seen before. I said bring
it round and let’s have a look. He is a keen member of a group of mildly eccentric
plant nuts, of which I must add; I like to include myself in.
He and Rod Edwards have during 1999 with intermittent
help from the likes of the local Ezimvelo KwaZulu-Natal Conservation Services
Park Warden, Ian Pattrick, and a band of people like Richard Boon,
Peter Turner, Isabel Eyeberg, Neil Crouch and Richard Symmonds been
fossicking about in the steep densely wooded slopes of the Krantzkloof Nature
Reserve adding plants to the already extensive plant list of the Reserve.
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The real botanists
and experts in the Acanthus Family - Trevor Edwards in Pietermaritzburg,
Kevin Balkwill in Johannesburg, Brian Schrire and the Kaj Vollesen at Kew
Gardens in the England helped us to give this plant its real name. The Latin
species name of pubi – hairy and nervia - nerves or veins is apt because
under the leaves the main veins are covered in fine hairs. The lag time in
getting plants identified was cut dramatically by using digital photography
to send images over the internet to the other side of the world and get an
answer in hours rather than days or weeks.
The Krantzkloof Nature Reserve is a deep gorge cut through the Natal Group
Sandstone by two main rivers the Molweni and Nkutu, that help form the escarpment
between the coastal plain and the interior inland of Durban.
Surrounded by a sea of suburbia above, and a semi-formal settlement below,
the Krantzkloof gorges are a life raft for a vast number of plant species,
many rare or endangered. Some are near local endemics, and one of these,
Brachystelma natalense, is believed extinct except for the area’s last small
population.
At about 1 500 hectares the gorge system is Durban’s largest remaining
natural area and a unique remnant of what existed a brief 150 years before
a tidal wave of settlement, suburbia and sugarcane engulfed the KwaZulu-Natal
coast.
Continuing residential development continues to whittle away at the natural
area, with the greatest impact on grasslands on the gorge plateaus. Yet
much of the remaining natural area survives because of its difficult terrain,
and a core area of 584 hectares is protected within the Krantzkloof Nature
Reserve, which was proclaimed in 1950.
This gorge has yielded surprises over the years and now with the keen eyes
of this band of enthusiasts at least 20 species new to the Durban Metropolitan
Region have been unearthed and amongst this list is the plant I am going
to describe to you.
How this plant has escaped detection over the years
will always remain a mystery I have personally walked through the plants
at least twice in the last 25 years. Probably with my eyes shut because
of the heat and humidity down in the depths of the Gorge!!
There are literally thousands of specimens from relatively large shrubs
of around 4-5 metres tall down to the youngest seedlings and suckers that
develop when a plant is damaged and the stem touches the soil it roots to
form another plant. A KZNCS Game Guard, Eseu Dlamini has discovered another
group of plants, in his patrols through the dense bush in the Gorge. These
plants grow on the south facing slopes of the gorge in virtually full shade
for most of the year.
When we first visited the site to photograph this species with other “plant
nutters” the mature specimens were in full bud and some plants just starting
to flower properly. June and July are the peak flowering months with seed
appearing in late July to August. Ready for the spring rains to get the
young plants off to a good start.
The normal Metarungia that is in the horticultural trade is Metarungia
longistrobus from the Mpumalanga Lowveld. This species has orange flowers
at the ends of the branches in May and June.
There is another species from the eastern Cape near East London known as
Metarungia galpinii this species also has orange flowers at the ends of
branches.
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Our Durban species has flowers
that are produced on the upper side of each branch in the same spikes that
are about the size of a human little finger. The red flowers pop out of the
spike a little like a snapdragon flower. The primary pollinators of this
plant are the forest sunbirds like the Grey, Olive and Collared Sunbirds.
Just sitting quietly in the colony these birds can be seen flitting about
from bush to bush feeding. In my own garden in 2007 there is a single flowering
specimen where Olive and Grey Sunbirds find this single plant in a see of
concrete covered suburbia. It forms a dominant undergrowth layer of
plants under the larger forest trees on the rocky scree slopes that are formed
below the high cliffs in the Gorge.
Another interesting plant amongst the colony
is the stemless forest cycad – Encephalartos villosus.
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The walk to these plants is not for the faint hearted.
It is steep and rocky and I knew I had muscles that I had not used in a
while after our trip.
The plant roots easily from cuttings and once the permits and other bureaucratic
formalities are complete this botanical group will be making plants available
to the public via seed and cuttings.
This effort will be used as a tool for this cash
strapped plant group to boost the funds for developing and maintaining a herbarium
developed by the locals and housed in the Krantzkloof Reserve to record the
rich variety of plants found in this gem of gorge right in the middle of
a huge human settlement that is Durban.
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