Avonia papyracea (part 1 of 2)

Even if one has no knowledge of Latin, it is probably easy to understand that papyracea means papery. This refers to the thin, white scales that cover the stems.
These scales are in fact modified stipules: outgrowths of the base of the leaf stalk. By reflecting and diffusing light, they act as sunshades. This effect, combined with controlled aeration*, reduces evaporation. The scales are also able to trap dew.
*It has been noted that in hot, dry conditions the scales tightly overlap each other like roof tiles, whereas in cooler and therefore damper weather they can open out to some extent so that the leaves are more exposed.
As Gordon Rowley in “Anacampseros, Avonia, Grahamia” (1995) remarks, it seems surprising that such an efficient adaptation has, apparently, evolved only once.

The scales are about 5 mm long and wide and hide the minute leaves.
The stems are usually about 5-8 cm long and 0.7-1 cm thick, arising from a thickened tuber. As in other Avonia species, the stems that carry flower buds grow more or less horizontal, but become erect on the day of flowering and stay that way until the seeds have been dispersed.
The scented flowers are creamy white and appear in late spring and early summer.
There are two subspecies: subsp. papyracea occurs throughout the Little Karoo and is also found in the Great Karoo, whereas subsp. namaensis occurs in southern Namibia, the Richtersveld and Bushmanland. Both subspecies seem to feel most at home amongst white quartz pebbles.
According to the literature the main difference between the two is that in the first one, the edges of the scales are entire (without any teeth or other incisions) and in the second one saw-edged to toothed.
The following pictures show plants of subsp. papyracea.

avonpapypap 2011-11-18 7100

avonpapypap 2011-04-17057

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Anacampseros comptonii (1)

When you have a first look at the kind of habitat this species is found in, it looks bare and desolate.
The photo below was made in the beginning of April after good rains,  so one would expect a lot of activity going on.  And there is, but the plants growing here are so small, that you have to look properly to see them. Accidentally, the other interesting dwarf succulent growing in this spot near Nieuwoudtville is a Conophytum named after the same person  (Prof R.H. Compton, the second director of the National Botanical Gardens in South Africa). More about that at a later stage.

anaccomp-hab 7582#2012-04-04

The plants grow in very shallow depressions in flat sandstone rocks. After rains, the depressions are filled with water and the little plants are often completely submerged for some time. The following picture was taken in September.

anaccomp Scan150

In the dry period the plants are often almost invisible (the picture below was taken in November). Can you see the little caudexes?

anaccomp Scan102

The last picture gives a better idea of how charming these miniatures are when in flower  (the caudexes are only 1-2 cm in diameter and 1-1.5 cm tall) .

anaccomp 7578#2012-04-04


Anacampseros albidiflora (1)

Plants of this species are found widespread in the Great and Little Karoo on stony slopes, usually sheltered by rocks or bushes. They are columnar and relatively thick, up to 4 cm tall (when not in flower).
The flowers are white to pale pink and appear mainly from October to January.


anacalbi 2011-09-18 6433

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