One guesses it has to do with the amount of chlorophyll, which one further supposes has to do with different capacities to photosynthesize, which one wildly speculates may indicate greater or lesser evolution from a non-parasitic ancestor (morning glory).
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timeasmymeasure
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Date: 2010-08-08 12:52 pm (UTC)How come Yankee Doodle Dodder is orange, compared to the sensible green colour of the Colonial version?!
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Date: 2010-08-08 01:16 pm (UTC)no subject
Date: 2010-08-08 01:20 pm (UTC)Different species/subspecies/chlorophyll requirements?!
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Date: 2010-08-08 01:20 pm (UTC)no subject
Date: 2010-08-08 01:23 pm (UTC)Well they don't need chlorophyll I guess if they mug, stab and strangle other plants for their lunch *g*
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Date: 2010-08-09 08:12 am (UTC)