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Shrub: Driedoring-Rhigozum trichotomum

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arks
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Driedoring (Rhigozum trichotomum)

Unread post by arks » Tue May 01, 2007 4:12 am

I'm finding some further "historical" plant ID questions as I'm scanning my KGP slides from 1992. Does anyone have any idea what this shrub might be:

Image
RSA 2016
4,5 April Melville
6-19 April KNP: Croc Bridge, Olifants, Shingwedzi, Pafuri Border
20-24 April Mapungubwe: Leokwe
25 April-28 May Darling
29 May-19 June Cape Town

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bucky
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Unread post by bucky » Wed May 02, 2007 5:31 pm

I will hazard a guess at the puzzle bush - Ehretia rigida , based on the growth form and small leaves .

Have a look here
The growth form looks very similar to this .
You might get a better comparison because I am finding it very difficult to pick up any details in the pic .

The only thing is the flowers dont look the same , although they are similar looking , maybe its another Ehretia species .

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arks
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Unread post by arks » Wed May 02, 2007 10:08 pm

Thanks, bucky and Imberbe. Yip, KGP = Kalahari Gemsbok Park, pix was taken there in October 1992. Does that help to narrow in on a possible ID?
RSA 2016
4,5 April Melville
6-19 April KNP: Croc Bridge, Olifants, Shingwedzi, Pafuri Border
20-24 April Mapungubwe: Leokwe
25 April-28 May Darling
29 May-19 June Cape Town

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bucky
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Unread post by bucky » Wed May 02, 2007 10:54 pm

Just thought of something , hows thetheRhigozum trichotomum look , i think this is the plant :D
The slight difference in flower colour can be due to age of the slide going slightly pink , or else just different minerals in the soil sometimes.

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Imberbe
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Unread post by Imberbe » Wed May 02, 2007 11:54 pm

Hi Bucky

This one really has me "puzzled"! It might in fact be a puzzle bush ... :lol: The flower on the photo is a little unclear, but it is to my mind the best argument for it indeed being the puzzle bush. It looks quite consistent with the flower of the puzzle bush. Colour and form!

What initially convinced me that it is not the puzzle bush were:

1. The leaves looked too small. However, this may be the result of the time of year (new leaves) or even the geology and climate of the area. The puzzle bush I know quite well grows in the Northern areas of SA, and plants do differ quite considerably. So I would disregard the leaf problem.

2. What however still has me sceptical is the growth form of the branches. The puzzle bush very typically hangs down, like a bush that has withered. This one grows up. This simply does not look like the growth form of the puzzle bush!

As to the other suggestions you made: Their flowers are very yellow/ white and this one is very not???? :doh:

Arks, could I suggest that you contact Jannie, the Kgalagadi Guru on this one. He should be able to help us.
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arks
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Unread post by arks » Thu May 03, 2007 1:56 pm

Here is the definite reply from Jannie. Seems bucky was spot on! :wink: And as always, thanks to everyone who jumped in with ideas, all quesses are interesting and informative! 8)

Jannie wrote:Arks,

The picture is indeed that of the "Driedoring-Rhigozum trichotomum

Rhigozum tricotomum is a shrub with white to pink flowers when in bloom. During very dry periods the plant sheds its leaves and appears to be dead. The loss of leaves is, however, an adaptation to prevent water loss by the plant by reducing the surface area through which transpiration can take place. The driedoring is a favourate food of the springbok. The pods, flowers and young shoots are eaten. the driedoring playes an inportant ecological role, as it fills the gap that was left by overgrazing, and stabilises dune slopes. It forms a barrier where seeds collect and germinate.
RSA 2016
4,5 April Melville
6-19 April KNP: Croc Bridge, Olifants, Shingwedzi, Pafuri Border
20-24 April Mapungubwe: Leokwe
25 April-28 May Darling
29 May-19 June Cape Town

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bucky
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Posts: 1225
Joined: Thu Nov 10, 2005 11:41 pm
Location: Gauties .

Unread post by bucky » Fri May 04, 2007 9:28 am

Nice to know :D .

The biggest hassle I had with the puzzle bush was also the growth shape , but I suspected At first it might be another ehretia .

Luckily now we have confirmation from Jannie , that its a driedoring (Three thorn - direct translation ).
Amazing how flower colour can throw a person off , especially due to changes because of location .


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