25 March 2008

Just in time

Leucospermum

As I get ready to leave town, a flurry of activity, of course, including the first bloom of my Leucospermum 'scarlet ribbons'. It hasn't really opened yet, and I was going to wait to photograph it, but I just couldn't resist because it is so AWESOME. The plant is literally covered in flowers.

Don't worry, I've got some more treats in reserve that will probably open when I'm gone.


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22 August 2007

Recovery

The latest Curtis's Botanical Magazine features an extraordinary illustration of the long-extinct Norfolk Island endemic Solanum bauerianum, reconstructed from Ferdinand Bauer's original drawings by Marion Westmacott:

Solanum bauerianum As with all his expedition field drawings, those of Solanum bauerianum are marked with numbers referring to a colour-code, each number referring to a different shade. Bauer used simple codes when working in Europe, that with 150 shades being preserved in the Real Jardín Botánico in Madrid, though a more elaborate one with 250 shades used for drawings to become Sibthorp’s Flora Graeca, has never been found (Lack & Ibáñez 1997, Lack 1999). For his Pacific work, Bauer devised a system with a thousand shades [emphasis mine]. Although it is also lost (if it ever existed in full), it has been possible (Pignatti-Wikus et al. 2000), by comparing the real colours of living plants in Western Australia with the numbers (2–994) used in extant Bauer sketches of the same species there, to reconstruct it.

There were a hundred different shades each of red, purple to pink, pink to mauve, and lilac and violet to blue, two hundred shades of green, a hundred each of yellow, orange, brown and white through grey to black. He also used cryptic abbreviated German and English words to designate texture and shininess. Bauer prepared a field sketch from living material before it faded, adding the numbers to indicate the colour shades to be used later to work up the finished drawing in watercolour. Such an elaborate code seems never to have been used by any other artist. Unwieldy as it seems, it allows the most sensitive depiction of colours of the living plant.

David Mabberley, Erika Pignatti-Wikus, and Christa Riedl-Dorn, "An Extinct Tree 'Revived'," Curtis's Botanical Magazine 24 (3) (2007), 190–195. At Blackwell-Synergy.

Note that the article is copyrighted by everyone, including Kew and Blackwell, and the illustration presumably by Marion Westmacott as well. Certainly Curtis's deserves credit for their work, which is not cheap for obvious reasons, but the danger is that such a rare publication will remain unknown to its audience. Anyway, the above is meant as a fair use indication of the interest of the article, the skill of the illustrator, and the excellence of the magazine, and why one might want to subscribe.

Although it isn't Bauer's sexiest work, his illustrations for Karl Friedrich Philipp von Martius's Historia naturalis palmarum, scanned by MOBOT, give a sense at least of his incredible precision.

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31 July 2007

The miracle of life

arum italicum berries
Honestly, I'm ambivalent at best on the arums, but as long as we're on the topic...

Everyday I see a "bed" of "landscaping" that consists of Ivy and trash (if that's not redundant). The Ivy is cut back maybe 3 times a year. But this hideous wasteland in fact harbors surprising biodiversity, not even counting the rats. Some kind of nightshady weed occasionally pokes its menacing berries through the groundcover, along with some brave, i.e. terrifyingly weedy, bindweed. But the interesting part is a stand of Arum italicum that has happily naturalized in this harsh environment. I can't tell if they were planted intentionally or not.

Last week I was staring at these ridiculous berries and contemplating the miracle of evolution: not only that such appealing things are produced from such a sinister plant, but the complicated and bizarre flowering apparatus that produced them (see the Dranunculus above [below]).

Anyway, I was wondering whether these berries are really appealing, or just bizarre, when some slack-jawed kid walked by and snapped off a stalk. Whether he carried it off as a gift for an unfortunate paramour, or simply as a distraction from his habitual stupefaction, no one can say. But is was a humbling example of natural selection in action.

And that is why I don't know if these arums were planted on purpose or not.


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18 July 2007

The gods must be crazy

Last night water fell from the sky. This might not sound very exciting to you, but such things are simply not done here.

I may never see raindrops on these passionflowers again.

It will be ten weeks before I can reasonably start to expect a meaningful amount of rain, so even .01 inch is a welcome diversion.


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12 March 2007

PSA: compost

Kalanchoe luciae
Beautiful weather, the miracle of March and daylight savings have combined to allow me to enjoy the garden after work earlier in the year. But today I am dreading it, because I should really turn the compost, and I'm feeling lazy.

Doesn't matter: I did a little research because I was worried about composting some big box store paperwhites, and this is what I found out from a recent review of the literature [Noble and Roberts, "Eradication of plant pathogens and nematodes during composting: a review," Plant Pathology 53 (2004), 548–568.]

  1. For 27 out of 32 pathogenic fungi, all six oomycetes, seven bacterial pathogens and nine nematodes, and three out of nine plant viruses, a peak temperature of 64–70°C and duration of 21 days were sufficient to reduce numbers to below, or very close to, the detection limits of the tests used.
  2. Several plant viruses were temperature-tolerant. These were CGMMV, /Pepper mild mottle virus/, /Tobacco rattle virus/, ToMV and TMV. TMV requires a peak compost temperature in excess of 68°C and a composting period longer than 20 days for eradication. However, TMV is degraded in compost over time, and can be eradicated after a composting period of 26 weeks, even at low temperature (31°C). ToMV in infected seeds can withstand over 70°C in an incubator for over 20 days. [TMV= tobacco mosaic, TomMV= Tomato mosaic; 31 C= 87.8 F; 70 C = 158 F]
  3. It is clear that the detection limits in most studies were quite poor, with infection levels of up to 5% likely to be undetected regularly.

My compost will never get hot enough no matter how much I turn it.


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