Aloe mawii grows tall, stout stems of up to 2 meters in height, though acaulescent forms can occur.
The stems sometimes branch higher up, in a tree-like form.
The leaves are up to 10 cm wide, spreading or recurved, with widely spaced teeth on their margins. They are blue-green in the shade, but can become reddish in full sun.
The flowers are orange-red, born on very short pedicels (1-2mm), on a simple, hardly branched inflorescence, which spreads out horizontally.
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References
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^Carter, S. Flora of Tropical East Africa - Aloaceae. CRC Press, 1994. ISBN9061913640