Strychnos ignatia

Names and Synonyms

Common Names

• Strychnos ignatia
• Ignatius-bean
• Saint Ignatius-beans
• St. Ignatius' Bean
• St. Ignatius bean

Scientific Names

Accepted name

Synonyms

• Strychnos maingayi var. fructuosa
• Ignatia amara
• Faba bengalensis
• Strychnos hainanensis
• Ignatiana philippica
• Strychnos krabiensis
• Strychnos lanceolaris
• Strychnos pseudotieute
• Strychnos balansae
• Strychnos beccarii
• Strychnos cuspidata
• Strychnos tieute
• Strychnos philippensis

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta, falling within the class Equisetopsida and subclass Magnoliidae. It is further classified under the order Gentianales and the family Loganiaceae. Finally, it is identified by the genus Strychnos.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a specific distribution pattern across parts of East and Southeast Asia. In China, its presence is noted in the South-Central, Southeast, and Hainan regions. Moving into the Indo-China peninsula, the species can be found growing in Thailand. It is also documented as being native to the landscapes of Vietnam. Together, these locations define the primary geographical range for Strychnos ignatii.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Strychnos ignatii is closely tied to specific altitudinal gradients within its native tropical habitats. This species is typically found inhabiting mid-elevation forest zones, where it thrives within a defined vertical distribution. Its ecological niche is characterized by an elevational range that begins at a minimum of 400 m AMSL and extends up to a maximum of 800 m AMSL. Within this specific topographical window, the plant maintains a mean elevation of approximately 600 m AMSL, suggesting a preference for the environmental conditions—such as temperature, humidity, and atmospheric pressure—typical of these mid-altitude tropical ecosystems.

Elevational range max:

800 m AMSL

Elevational range mean:

600 m AMSL

Elevational range min:

400 m AMSL

Morphology

The morphology of Strychnos ignatii is characterized by its growth as a woody liana, functioning as an obligatory climber. This plant typically attains a significant height, with a mean height of approximately 20 m. Although it shares some structural characteristics with a shrub in its development, its primary growth form is that of a vine. As a terrestrial species, it grows in the ground rather than as an epiphyte, maintaining a sturdy, woody structure throughout its lifecycle.

Climber :

liana

Climber :

obligatory

Epiphyte :

terrestrial

Growth form :

shrub

Plant height mean:

20 m

Woodiness :

woody

Physiology

The physiology of Strychnos ignatii is characterized by its complex secondary metabolism, specifically the biosynthesis of potent indole alkaloids within its seeds. The plant utilizes specialized metabolic pathways to produce strychnine and brucine, which serve as chemical defense mechanisms against herbivory. Its physiological processes are governed by standard photosynthetic mechanisms typical of woody tropical climbers, facilitating the conversion of light energy into chemical energy to support its climbing growth habit. In terms of nutrient cycling and soil interaction, the plant is not a nitrogen fixer; it lacks the symbiotic relationship with nitrogen-fixing bacteria, such as Rhizobium, that would allow it to convert atmospheric nitrogen into a usable form. Consequently, it relies on the uptake of mineralized nitrogen from the soil through its root system to support its protein synthesis and overall vegetative development.

Nitrogen fixer :

no

Reproduction

The reproduction of Strychnos ignatii is centered around the production and dispersal of its seeds, which exhibit a highly consistent morphology. The seeds produced by this species are characterized by a uniform size and weight, with a seed mass that remains constant across observed specimens. Specifically, the seed mass is measured at exactly 1 g, with a mean, maximum, and minimum value all equating to this single value. This uniformity in seed mass suggests a stabilized reproductive strategy within the species, ensuring that each propagule carries a consistent amount of nutrient reserves to support early seedling development.

Seed mass mean:

1 g

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Strychnos ignatii has 2 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include strychnine, BRUCINE.

strychnine

1. Lloydia
2. Yao xue xue bao = Acta pharmaceutica Sinica

BRUCINE

1. Yao xue xue bao = Acta pharmaceutica Sinica