Juglans pyriformis
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Juglans pyriformis is a Mexican tree of the genus walnuts ( Juglans ).
features
Juglans pyriformis is a large, deciduous tree. It reaches heights of growth of 10 to 25 m, has a straight, upright trunk and reaches a diameter of 90 cm and more at chest height . The twigs are stocky, chocolate brown to gray brown, with conspicuous lenticels . in plants with hairy leaves the twigs are hairy and soon bald, in plants with bare leaves the twigs are also bare. The pith of the branches is light brown. The terminal bud is elongated, slender and light brown. The lateral buds are brown, glabrous or sometimes hairy gray.
The leaves are large, around 40 to 60 cm long and up to 30 cm wide. They are unpaired, more rarely in pairs. The rachis is velvety or glandular hairs hardly depending on the tree or. The 18 to 31 leaflets are alternate to opposite, are lanceolate to elongated lanceolate and 10 to 15 cm long and 3 to 4.5 cm wide. They are not or barely stalked, the leaf base is heart-shaped to truncated or rounded, and slightly asymmetrical. The end ends in a long point. The leaf margin is sawn. The upper side of the leaf is bare to almost bare and only hairy on the nerves. The underside of the leaf can be more hairy, but also bare.
The male catkins are 18 to 22 cm long and consist of rather large, distant flowers . Their bracts are rather small at 1 mm. It is rounded, not very hairy and stands at the tip of the flower stalk at the base of the flower cup. The flower has 43 to 58 stamens , the anthers of which are glabrous.
The female inflorescence is an ear of around 4 cm in length with three flowers. The bracte and the two bracts are fused with each other and with the base of the flower. There are four sepals 3 to 4 mm long . The stylus is in two parts.
The fruit is a stone fruit- like nut with a shell. almost spherical to slightly pear-shaped, from which the epithet pyriformis (= pear-shaped) is derived. They are 4.5 to 5 cm long with a diameter of 4.3 to 4.7 cm. The surface is bare and covered with large, gray to light brown warts. The nut is large, hard and thick-shelled, almost spherical or compressed. It is 3.5 to 4 cm long, in cross section 4 × 3.5 to 4.5 to 4 cm in size. It is strongly longitudinally ribbed, with narrow but rounded to wide and flat ribs. The furrows are particularly deep at the base of the nut.
distribution
Juglans pyriformis is endemic to Mexico: The species occurs only in the Sierra Madre Oriental in the states of Veracruz and Hidalgo .
supporting documents
- Wayne E. Manning: The Genus Juglans in Mexico and Central America . Journal of the Arnold Arboretum, Volume 38, 1957, pp. 121-150.
- Héctor V. Navare Flores: Juglandaceae . Flora de Vera Cruz, Volume 31, Instituto Nacional de Investigaciones sobre Recursos Bióticos, Xalapa 1983, ISBN 84-89600-51-1