Forest Knobwood

Names and Synonyms

Common Names

• Forest Knobwood

Scientific Names

Accepted name

Synonyms

• Fagara davyi
• Zanthoxylum thunbergii var. grandifolium

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta, falling under the class Equisetopsida and subclass Magnoliidae. Within the order Sapindales, it is classified under the family Rutaceae. Finally, it is categorized under the genus Zanthoxylum as the species Zanthoxylum davyi.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a diverse presence across several regions within the southern portion of the continent. In South Tropical Africa, its distribution can be specifically noted within Zimbabwe. Moving into the broader Southern Africa region, it is found throughout the Cape Provinces. The species is also documented in the KwaZulu-Natal area of Southern Africa. Finally, its range extends to the Northern Provinces and the nation of Eswatini.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Zanthoxylum davyi is defined by its significant adaptability to varied altitudinal gradients, allowing it to occupy a wide range of montane and sub-montane habitats. This species exhibits a broad vertical distribution, thriving in diverse environmental conditions from low-lying areas at a minimum elevation of 160 m AMSL to higher mountainous terrains reaching a maximum elevation of 1900 m AMSL. This extensive elevational range suggests that the plant is capable of tolerating fluctuating temperature regimes and varying levels of atmospheric pressure associated with different mountain strata. Such ecological plasticity enables it to colonize diverse microclimates, facilitating its presence across a spectrum of forest types and topographical features within its natural range.

Elevational range max:

1900 m AMSL

Elevational range min:

160 m AMSL

Life history

The life history of Zanthoxylum davyi is characterized by its nature as a perennial organism, meaning it persists through multiple growing seasons rather than completing its cycle within a single year. As a long-lived woody species, it undergoes a continuous cycle of seasonal development, establishing a robust structural foundation that allows it to endure environmental fluctuations over many years. Its developmental trajectory involves an initial establishment phase followed by sustained vegetative growth and periodic reproductive cycles, typical of perennial woody plants that invest significant energy into long-term survival and structural complexity.

Lifecycle :

perennial

Morphology

The morphology of Zanthoxylum davyi is characterized by its growth form as a woody tree. As a terrestrial and independent species, it does not function as a parasite or an epiphyte, maintaining a self-supporting structure rather than growing as a liana or vine. The plant reaches significant dimensions, with a height ranging from a minimum of 8 meters to a maximum of 30 meters, maintaining an average plant height of approximately 20 meters.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

tree

Parasite :

independent

Plant height max:

30 m

Plant height mean:

20 m

Plant height min:

8 m

Woodiness :

woody

Physiology

The physiology of Zanthoxylum davyi is characterized by a C3 photosynthetic pathway, a common metabolic strategy among woody perennials that involves the direct fixation of carbon dioxide through the Calvin cycle. As a plant utilizing this pathway, it relies on the enzyme RuBisCO to initiate carbon assimilation, which typically occurs under moderate environmental conditions. Furthermore, the species does not function as a nitrogen fixer, meaning it lacks the symbiotic relationship with nitrogen-fixing bacteria required to convert atmospheric nitrogen into usable forms and must instead depend on the uptake of nitrates or ammonium present in the soil substrate.

Nitrogen fixer :

no

Photosynthetic pathway :

C3

Reproduction

The reproduction of Zanthoxylum davyi is driven by biotic pollination syndromes, indicating a reliance on living organisms to facilitate the transfer of pollen. Specifically, the plant utilizes insect pollination as its primary mechanism, involving various insect vectors to ensure successful fertilization. Furthermore, the reproductive process is characterized by the absence of self-fertilization, meaning the plant requires cross-pollination between different individuals to achieve successful seed production and maintain genetic diversity.

Pollination syndrome :

insect

Pollination syndrome :

biotic

Self fertilization :

absent

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Zanthoxylum davyi has 1 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include TAT.

TAT

1. Journal of ethnopharmacology

Conditions

Zanthoxylum davyi has 2 reported investigations on conditions identified across 0 scientific publications and several other databases. The most consistently reported conditions include NF-kappaB, neurological disorders.

Nf-kappab

1. Journal of ethnopharmacology

Neurological disorders

1. Asian Pacific journal of tropical medicine

Preparations

Zanthoxylum davyi has 3 reported preparations identified across 0 scientific publications and several other databases. The most consistently reported preparations include Crude methanol and water extracts, acetone extract, chloroform extract.

Crude methanol and water extracts

1. Fitoterapia

Acetone extract

1. Journal of ethnopharmacology

Chloroform extract

1. Journal of ethnopharmacology