Tepary bean ( Phaseolus acutifolius )
The tepary bean ( Phaseolus acutifolius ) is a plant of the subfamily Schmetterlingsblütler (Faboideae) within the family of the Leguminosae (Fabaceae or Leguminosae). This crop is closely related to a number of other crops called " beans " .
The tepary bean comes from the arid regions in northern Mexico . It has been grown there for at least 5000 years. Their cultivation has never been widespread, but interest has increased due to their drought resistance. One is also interested in erosion protection.
The wild forms of the tepary bean are mostly herbaceous plants lying on the ground and creeping , the stems of which can reach lengths of up to 3 meters. The cultivated forms of the tepary bean usually grow as short-lived, upright herbaceous plants that reach heights of about 30 cm, some varieties also grow creeping or can climb other plants or climbing devices with stems up to 2 meters long . It is a very drought-resistant type of bean and a short-day plant.
The lowest about 5 cm long stalked leaves are simple, long-oval, 5 to 6 cm long and 3 to 4 cm wide, with. All other leaves are pinnate in three parts with stems up to 15 cm long. The three pointed-oval partial leaves have a length of 4 to 8 cm and a width of 2 to 3 cm.
The legumes , covered with silky hair, are usually 5 to 8, at most up to 15 cm long and about 1 cm thick. Each legume contains about seven seeds, which are clearly visible on the surface of the pod. The round to elongated seeds are about 5 to 10 mm × 6 mm in size and have a narrow, arched navel. The Testa is matt silky and the grain color varies from white, pink, brown to black-violet, there are also speckled varieties. The thousand grain weight varies between 125 and 175 g.
The number of chromosomes is 2n = 22.
The (young) pods are used as vegetables , the dried seeds in soups.
- Walter H. Schuster, Joachim Alkämper, Richard Marquard & Adolf Stählin: Legumes for grain use: Grain legumes of the world , Justus Liebig University Gießen, 1998 .: Joachim Alkämper: Information on the tepary bean ( Phaseolus acutifolius A. Gray var. Latifolius GFFreemann). (German)