The only yellow coloured Aloe I remember seeing at the Botanical Garden. Its really cool and I think it was a low growing species too. Aloe sinkatana by tindomul1of9, on Flickr
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
I love yellow flowers. Most of my aloes and aloe relatives veer towards the red/orange/pink color range. I think I have a Haworthia whose flowers are called "yellow", but which are actually more of a tan.