Ulmus ismaelis
Encyclopedia
Ulmus ismaelis Todzia & Panero is a small tree recently discovered in southern Mexico
, endemic to riparian forest
along the Mixteco River system in northeastern Oaxaca
, where it grows among large boulders in the limestone canyons.
leaves are coriaceoeus, < 9.6 cm in length by 4.6 cm broad, acute at the apex, pinnately veined, on short (2-5 mm) petioles; the colour ranges from dull-green to light-brown. The apetalous flowers are arranged as short racemes on leafless twigs, sparsely clustered on < 7 mm peduncles.
The samarae
are < 22 mm by 13 mm, tapering at the base to a < 4 mm stalk, and are shed during June and July .
, who discovered the tree.
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...
, endemic to riparian forest
Forest
A forest, also referred to as a wood or the woods, is an area with a high density of trees. As with cities, depending where you are in the world, what is considered a forest may vary significantly in size and have various classification according to how and what of the forest is composed...
along the Mixteco River system in northeastern Oaxaca
Oaxaca
Oaxaca , , officially Estado Libre y Soberano de Oaxaca is one of the 31 states which, along with the Federal District, comprise the 32 federative entities of Mexico. It is divided into 571 municipalities; of which 418 are governed by the system of customs and traditions...
, where it grows among large boulders in the limestone canyons.
Description
Rarely growing to > 15 m in height, the tree has exfoliating orangish bark. The ovateLeaf shape
In botany, leaf shape is characterised with the following terms :* Acicular : Slender and pointed, needle-like* Acuminate : Tapering to a long point...
leaves are coriaceoeus, < 9.6 cm in length by 4.6 cm broad, acute at the apex, pinnately veined, on short (2-5 mm) petioles; the colour ranges from dull-green to light-brown. The apetalous flowers are arranged as short racemes on leafless twigs, sparsely clustered on < 7 mm peduncles.
The samarae
Samara (fruit)
A samara is a type of fruit in which a flattened wing of fibrous, papery tissue develops from the ovary wall. A samara is a simple dry fruit and indehiscent . It is a winged achene...
are < 22 mm by 13 mm, tapering at the base to a < 4 mm stalk, and are shed during June and July .
Etymology
Named for Mexican botanist and collector Dr Juan Ismael CalzadaJuan Ismael Calzada
Juan Ismael Calzada is a Mexican botanist and collector. Dr Calzada is credited with the discovery of the elm Ulmus ismaelis, named in his honour.- Partial works :...
, who discovered the tree.