Aloe ferox (Bitter aloe)

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Aloe ferox Mill.

Bitter aloe, red aloe, cape aloe

Kingdom	Plantae	Plants, but not fungi, lichens, or algae
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Liliopsida	Monocots (plants with a single seed leaf); includes the lily family
Subclass	Liliidae	Includes lilies, orchids, and many others
Order	Asparagales	A diverse group that includes asparagus
Family	Xanthorrhoeaceae	Aloes, many tropical plants, flax lilies, daylilies, many others
Genus	Aloe	Means “goddess” in ancient Sanskrit, for its reputed use as a beauty aid; some sources suggest that the name comes from Alloeh, meaning “shining bitter substance”
Species	ferox	Ferocious, very thorny

About plant names...

The name of this species, ferox, refers to the "ferociousness" of the fiery flowers and the sharp, unforgiving leaves. It is native to South Africa, and not found in the wild in North America.

Identification: Plants are treelike in shape, with a stem clothed in dead aloe leaves, and reach 10′ (3 m) in height. The leaves are bluish-green, with leaf tips sometimes appearing red in very dry weather. Leaves are serrated and crescent-shaped in cross section, forming a rosette atop a trunk. Flowers form tall yellow to orange-red spikes 2-4′ (60-121 cm) above the leaf cluster. There are five to ten flower stalks per aloe. See the Aloe comparison table.

Medical: Unsubstantiated health claims abound for this plant. The only substantiated one that I could find was that it compared reasonably well with senna-based preparations as a laxative. As an example of the dubious claims about Aloe ferox:

"Over 130 biological active compounds of the aloe ferox have so far been reported. The Aloe ferox leaf contains substances such as amino acids, minerals, vitamins, polysaccharides, glycoproteins, anthraquinones, enzymes, lignin, chlorophyll, saponins, sterols and other plant chemicals with numerous medicinal activities."^[1]

Sounds impressive, right? At least until you consider the fact that every single one of these substances is part of all plants! These are among the more common of the roughly 30,000 compounds that are found in a typical plant. (If you're a professional botanist with a tendency to nitpick, you may be thinking 'Wait! Anthraquinone! That's not in every plant.' True, though it is hard to see how a substance that is used as a building block in the creation of certain artificial dyes would make you healthier.)

Online References:

Floridata.com

The South African National Biodiversity Institute's web site, plantzafrica.com

The Kew Royal Botanic Gardens

ARKive: Images of Life on Earth

The Succulent Plant Page