Aspidosperma quebracho-blanco aka Kebrako

Aspidosperma quebracho-blanco, or quebracho blanco, is an evergreen tree. It belongs to the Apocynaceae family. Its native range covers Bolivia, Argentina, Paraguay, and Uruguay. Kew places it in the subtropical climate zone. It grows in dry forests, from sea level into uplands. Records place it as high as 5,900 feet [1,800 metres].

This tree can reach 98 feet [30 metres] tall. Another entry gives a height of 82 feet [25 metres]. The sources do not define a usual garden height. Its straight trunk has a round cross-section and thick bark. Trunk widths range from about 1 to 1.6 feet [0.3–0.5 metres]. It keeps its leaves throughout the year. The flowers have both male and female organs. Insects pollinate them, and the fruit forms a seed capsule.

PFAF lists both full sun and light shade as suitable. It also reports a preference for moist soil. This differs from the dry forests where it grows wild. The soil can be sandy, loamy, or clay-based. Its listed pH range runs from mildly acid to mildly alkaline. PFAF includes it as a tree for woodland gardens. Useful Tropical Plants values its form for ornamental planting. Yet that source says people seldom grow it in cultivation. People gather it from the wild instead.

Seeds offer a means of raising new trees. They lose their ability to germinate after a short time. Useful Tropical Plants recommends sowing them soon after they ripen. A nursery seedbed with light shade suits this stage. The source reports germination rates above 70 percent. Seeds may sprout within a few days of sowing. Move seedlings into separate pots at 0.13–0.20 feet [0.04–0.06 metres] tall.

The wood is very hard and has practical uses. Indigenous South American peoples have used the tree for fever. PFAF also records use for asthma, emphysema, and muscle spasms. Other recorded uses include tonics and treatments for cuts and burns. The plant contains yohimbine. These records describe medicinal use, not proof of safe treatment. Useful Tropical Plants warns that excessive doses can be toxic. PFAF lists no known edible uses and gives no food value.