Sorry, but
Drosera capensis "alba", no matter how you write it, is an entirely bogus name. Yes, it is different from the species
Drosera alba. It wasn't discovered in the "wild", but occurred in cultivation. This does qualify it for being registered as a cultivar, and at least some of these white flowered plants were registered as,
Drosera capensis 'Albino' -- the publishing details are linked to the name. Even though it was published in "The Savage Garden" and that publishing was recorded in the CP Database as
<dl><dt>N: ~[Drosera capensis var. alba {D'Amato}] </dt><dd>P: Savage Garden:129 (1998)</dd><dd>S: =[Drosera capensis {L.}]</dd><dd>C: nom.nud.</dd></dl>It is clear that this publishing was not copacetic as concerns the validity of the name,
Drosera capensis var.
alba.
Currently "alba" is only valid as a name in the genus
Drosera, when used for the species,
Drosera alba. There is a cultivar name, validly published for these white flowered forms of
Drosera capensis. However,
Drosera capensis var.
alba is not a validly published name, nor has it ever been.
Bogus names are still, bogus names, even if I called
Drosera capensis 'Albino',
Drosera capensis "great white lotus" and convinced a hundred other growers to use that name, too. It would still be a bogus/false name and remain invalid, and likely be a source of confusion -- especially to growers attempting to learn correct plant nomenclature.
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An interesting observation is that plants which are actually devoid of red pigmentation in all parts, may not appear so. Apparently the droplets of mucilage on the tentacle tips will pick up and reflect ambient light from object near them, such as hands/fingers, this makes them appear to have their own, darker pigment, when, in fact, they are only green or transparent.