Lonchocarpus martynii
Lonchocarpus martynii
Safety & Hazards
The plant contains rotenone and has been used traditionally as a fish poison[1] - the rotenone kills or stuns the fish making them easy to catch, but the fish remain perfectly edible for mammals. Rotenone is classified by the World Health Organization as moderately hazardous. It is mildly toxic to humans and other mammals, but extremely toxic to many insects (hence its use as an insecticide) and aquatic life, including fish. This higher toxicity in fish and insects is because the lipophilic rotenone is easily taken up through the gills or trachea, but not as easily through the skin or the gastrointestinal tract. The lowest lethal dose for a child is 143 mg/kg, but human deaths from rotenone poisoning are rare because its irritating action causes vomiting. Deliberate ingestion of rotenone, however, can be fatal. The compound decomposes when exposed to sunlight and usually has an activity of six days in the environment.
Cultivation Details
This species has a symbiotic relationship with certain soil bacteria, these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[].
Propagation
Like many species within the family Fabaceae, once they have been dried for storage the seeds of this species may benefit from scarification before sowing in order to speed up and improve germination. This can usually be done by pouring a small amount of nearly boiling water on the seeds (being careful not to cook them!) and then soaking them for 12 - 24 hours in warm water. By this time they should have imbibed moisture and swollen - if they have not, then carefully make a nick in the seedcoat (being careful not to damage the embryo) and soak for a further 12 hours before sowing[PFAF]. Cite as: Tropical Plants Database, Ken Fern. tropical.theferns.info. 2026-02-20. <tropical.theferns.info/viewtropical.php?id=Lonchocarpus+martynii>
Pollinators
Insects
References
- [1]Medicinal Plants of the Guianas — DeFilipps, R. A.; Maina, S. L.; & Crepin, J. · Smithsonian Museum · http://botany.si.edu/bdg/medicinal/index.html ↩︎A down-loadable PDF document of a book in pre-publication awaiting illustration. An excellent, if rather terse, guide to the traditional medicinal uses of the plants of the region
- [2]Rotenone-Yielding Plants of South America — Krukoff B.A. & Smith A.C. · 1937 ↩︎
- [3]Plant Resources of Southeast Asia — http://proseanet.org/ ↩︎Lots of information on the uses of the plants of SE Asia.
- [4]Ecocrop — http://ecocrop.fao.org/ecocrop/srv/en/home ↩︎Basic information on a wide range of useful plants, plus details of environmental needs where available.
- [5]The Leguminosae; A Source Book of Characteristics, Uses and Nodulation — Allen O.N.; Allen E.K. · University of Wisconsin · 1981 · ISBN 0-333-32221-5 ↩︎An amazing and comprehensive work, giving a brief guide to the many genera of the family Fabaceae and also the principle uses of the genus.
- [6]Plants of Possible Insecticidal Value - A Review of the Literature up to 1941 — McIndoo N.E. · USDA; Bureau of Entomology and Plant Quarantine · 1945 ↩︎Information on the insecticidal properties (or not) of almost 1,200 species of plant. Rather dated but still with information hard to obtain elsewhere. It can be downloaded from the Intenet
- [PFAF]Plants for a Future — pfaf.org ↩︎