Helicostylis tomentosa

Helicostylis tomentosa is an evergreen tree in the Moraceae family. Its native range runs from Panama into tropical South America. It grows in wet rainforest and forms part of the canopy. Its range includes Brazil, Bolivia, Peru, Ecuador, Colombia, and Venezuela. It also grows in the Guianas. Some people call it letter wood or letterhout. Wild trees supply fruit, timber, and materials for local medicine.

Garden listings give a height near 66 feet [20 metres]. They also list a spread of 66 feet [20 metres]. Forest accounts give heights of 49–85 feet [15–26 metres]. The crown has a slim, drawn-out shape. The trunk grows straight and has a round cross-section. It can reach about 1.6 feet [0.5 metres] across. The tree keeps its leaves year-round and yields yellow latex.

Male and female flowers grow on separate trees. Grow both sexes when fruit and seed are the goal. The fruit is yellow and roughly round. It measures about 0.1 feet [0.03 metres] across. People eat it raw and value its taste. This makes the tree useful in tropical food forests. The edible fruit does not mean all parts are safe. Sources warn that swallowing the latex can cause poisoning.

Young trees need shade broken by patches of light. As they grow, they can cope with full sun. The tree grows at a moderate pace. It needs moist soil with good drainage. Sandy, loamy, and clay soils can all suit it. It accepts mildly acid, neutral, and mildly alkaline soil. PFAF lists it for USDA zones 10–12. Sow fresh, ripe seed in a partly shaded nursery bed. Few seeds may sprout, and emergence takes 40–60 days.

The wood has uses in furniture and building work. Dark heartwood contrasts with a broad band of golden sapwood. The timber lasts well and resists wood-eating insects. It takes a fine polish but can blunt cutting tools. Traditional uses include bark preparations for stomach cramps and fever pain. Reports also describe hallucinogenic use of bark sap. Bark extracts have shown effects that slow central nervous system activity. These reports do not establish safe home treatments. Useful Tropical Plants reports a Least Concern assessment from 2011.