Bitter aloe

Names and Synonyms

Common Names

• Cape aloe
• bitter aloe

Scientific Names

Accepted name

Synonyms

• Aloe galpinii
• Pachidendron pseudoferox
• Pachidendron supralaeve
• Aloe ferox var. galpinii
• Pachidendron ferox
• Aloe ferox var. incurvata
• Aloe perfoliata var. ferox
• Aloe pseudoferox
• Aloe subferox
• Aloe supralaevis
• Aloe supralaevis var. erythrocarpa
• Aloe horrida
• Aloe ferox var. subferox

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and is classified under the phylum Streptophyta and class Equisetopsida. Within the subclass Magnoliidae, it is ordered under Asparagales and placed in the family Asphodelaceae. Finally, it is identified by the genus Aloe, specifically as the species Aloe ferox.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant is widely recognized for its presence within the diverse landscapes of Southern Africa. Its primary distribution can be found throughout the various Cape Provinces. Additionally, the species is known to inhabit the mountainous regions of Lesotho. It also grows naturally across the expansive plains of the Free State. Consequently, these specific areas define the core geographical range of Aloe ferox.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Aloe ferox is characterized by its adaptation to diverse topographical gradients, primarily thriving within a specific altitudinal band that spans from a minimum of 10 m AMSL to a maximum of 670 m AMSL. This species is typically found in arid to semi-arid environments, often colonizing rocky slopes, scrublands, and open plains where it can withstand intense solar radiation and periodic drought. Its distribution within this elevational range allows it to occupy various microclimates, ranging from coastal lowlands to slightly more elevated, rugged terrains, provided the soil drainage is sufficient and the moisture levels remain consistent with its succulent nature.

Elevational range max:

670 m AMSL

Elevational range min:

10 m AMSL

Life history

The life history of Aloe ferox is characterized by its status as a perennial plant, allowing it to persist through multiple growing seasons within its natural habitat. As a robust species, it exhibits a complex life form that can be classified both as a phanerophyte, due to its significant upright growth, and as a nanophanerophyte, reflecting its specialized structural adaptations. Throughout its existence, the plant maintains an evergreen deciduousness, ensuring that its succulent foliage remains functional and photosynthetic across different periods of the year without the need for seasonal shedding.

Deciduousness :

evergreen

Life form :

nanophanerophyte

Life form :

phanerophyte

Lifecycle :

perennial

Morphology

The morphology of Aloe ferox is characterized by a robust, woody growth form that can present as both a shrub and a tree. As a terrestrial species, it is an independent organism that does not function as a parasite or an epiphyte. The plant is self-supporting rather than a climber, maintaining a substantial structural presence with a height that typically reaches a mean of 3 m, though individual specimens can vary significantly, ranging from a minimum of 2 m to a maximum of 5 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

shrub

Growth form :

tree

Parasite :

independent

Plant height max:

5 m

Plant height mean:

3 m

Plant height min:

2 m

Woodiness :

woody

Physiology

The physiology of Aloe ferox is characterized by specialized metabolic adaptations designed for survival in arid environments, most notably its use of the Crassulacean Acid Metabolism (CAM) photosynthetic pathway. By utilizing this CAM mechanism, the plant can fix carbon dioxide at night when temperatures are lower and humidity is higher, storing it as organic acids to be utilized for photosynthesis during the day; this process significantly minimizes transpirational water loss through nocturnal stomatal opening. Furthermore, regarding its nutrient acquisition strategies, Aloe ferox is not a nitrogen fixer, meaning it lacks the symbiotic relationship with nitrogen-fixing bacteria required to convert atmospheric nitrogen into usable forms, relying instead on the uptake of nitrates and ammonium from the soil through its root system.

Nitrogen fixer :

no

Photosynthetic pathway :

CAM

Reproduction

The reproduction of Aloe ferox is characterized by a biotic pollination syndrome, specifically relying on bees to facilitate the transfer of pollen. The plant does not exhibit self-fertilization, as this trait is absent, necessitating cross-pollination to ensure genetic diversity. Following successful pollination, the production of seeds follows specific mass parameters: the individual seed mass ranges from a minimum of 0.00156 g to a maximum of 0.00189 g, with a calculated mean seed mass of 0.001725 g.

Pollination syndrome :

bee

Pollination syndrome :

biotic

Seed mass max:

0.00189 g

Seed mass mean:

0.001725 g

Seed mass min:

0.00156 g

Self fertilization :

absent

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Aloe ferox has 3 reported plant parts identified across 8 scientific publications and several other databases that are studied for medicinal purposes. The most consistently reported plant part include leaf, root, seed.

Leaf

1. Journal of ethnopharmacology
2. Planta medica
3. Pakistan journal of pharmaceutical sciences
4. Frontiers in pharmacology
5. Tropical animal health and production

Root

1. Frontiers in pharmacology

Seed

1. Natural product communications

Chemicals

Aloe ferox has 29 reported phytochemicals identified across 8 scientific publications and several other databases. The most consistently reported chemicals include Flavonoids, aloin, 5-Hydroxyaloin A, 7-Hydroxyaloin, ALOINOSIDE B.

Flavonoids

1. African journal of traditional, complementary, and alternative medicines : AJTCAM
2. Frontiers in pharmacology

aloin

1. Planta medica
2. Talanta

5-Hydroxyaloin A

1. Planta medica

7-Hydroxyaloin

1. Talanta

ALOINOSIDE B

1. Planta medica

Al

1. African journal of traditional, complementary, and alternative medicines : AJTCAM

Aloeresin A

1. Planta medica

Aloeresin C

1. Planta medica

Aloesin

1. Planta medica

Aloinoside A

1. Planta medica

Activities

Aloe ferox has 4 reported activities identified across 8 scientific publications and several other databases. The most consistently reported activities include Antioxidant, Antibacterial, Antifungal, Laxative.

Antioxidant

1. Scientific reports
2. Frontiers in veterinary science

Antibacterial

1. Heliyon

Antifungal

1. Scientific reports

Laxative

1. Medicine

Conditions

Aloe ferox has 19 reported investigations on conditions identified across 8 scientific publications and several other databases. The most consistently reported conditions include wound healing, Diabetes mellitus, anaplasmosis, babesiosis, backache.

Wound healing

1. Journal of ethnopharmacology
2. Biology
3. Frontiers in pharmacology

Diabetes mellitus

1. Natural product communications

Anaplasmosis

1. Tropical animal health and production

Babesiosis

1. Tropical animal health and production

Backache

1. Frontiers in pharmacology

Blood pressure

1. Medicine

Constipation

1. Human & experimental toxicology

Ehrlichiosis

1. Tropical animal health and production

Glycemic control

1. Medicine

Headache

1. Frontiers in pharmacology

Preparations

Aloe ferox has 28 reported preparations identified across 8 scientific publications and several other databases. The most consistently reported preparations include ethanol extracts, methanol, A. ferox gel, A. ferox whole-leaf, Cape Aloes.

Ethanol extracts

1. Journal of helminthology
2. Tropical animal health and production

Methanol

1. Scientific reports
2. Heliyon

A. ferox gel

1. Journal of ethnopharmacology

A. ferox whole-leaf

1. Journal of ethnopharmacology

Cape aloes

1. Planta medica

Acetone

1. Scientific reports

Acetone leaf

1. Pakistan journal of pharmaceutical sciences

Acetone leaf extract

1. Pakistan journal of pharmaceutical sciences

Acetone root extract

1. Pakistan journal of pharmaceutical sciences

Aqueous leaf

1. Pakistan journal of pharmaceutical sciences