The natural hybrid elm

Elm

Elms are deciduous and semi-deciduous trees comprising the genus Ulmus in the plant family Ulmaceae. The dozens of species are found in temperate and tropical-montane regions of North America and Eurasia, ranging southward into Indonesia. Elms are components of many kinds of natural forests...

 Ulmus × mesocarpa M. Kim & S. Lee is a cross of Ulmus macrocarpa with Japanese Elm Ulmus davidiana var. japonica discovered on Seoraksan

Seoraksan

Seoraksan is the highest mountain in the Taebaek mountain range in the Gangwon province in eastern South Korea. It is located in a national park near the city of Sokcho. After the Hallasan volcano on Jeju Island and Jirisan in the south, Seoraksan is the third highest mountain in South Korea. The...

 (Mount Sorak) near the city of Sokcho

Sokcho

Sokcho is a city in Gangwon-do province, South Korea. It is located in the far northeast of Gangwon-do. Lying north of the 38th parallel, the city belonged to North Korea from 1945 until the end of the Korean War, when the dividing line between the two Korean states was officially altered....

 on the eastern coast of South Korea

South Korea

The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

. The tree is endemic to the provinces of Gangwon-do

Gangwon-do (South Korea)

Gangwon-do is a province of South Korea, with its capital at Chuncheon. Before the division of Korea in 1945, Gangwon and its North Korean neighbour Kangwŏn formed a single province.-History:...

, Injegun, Bukmyeon, Yongdaeri, and Baekdamsa

Baekdamsa

Baekdamsa is a Buddhist temple in Inje County, Gangwon province, South Korea. It was originally built in the 7th century, but because of war and natural disasters has been rebuilt numerous times since then. The present version was completed in 1957. Additionally, the name has also changed over...

. .

Description

A small tree < 5 m high, typically intermediate between its parents, the generally obovate

Leaf shape

In botany, leaf shape is characterised with the following terms :* Acicular : Slender and pointed, needle-like* Acuminate : Tapering to a long point...

 leaves 7 cm - 8 cm long, asymmetric at the base, with apices acuminate

Leaf shape

In botany, leaf shape is characterised with the following terms :* Acicular : Slender and pointed, needle-like* Acuminate : Tapering to a long point...

 to caudate

Leaf shape

In botany, leaf shape is characterised with the following terms :* Acicular : Slender and pointed, needle-like* Acuminate : Tapering to a long point...

 and an average of 31 teeth. The petiole

Petiole (botany)

In botany, the petiole is the stalk attaching the leaf blade to the stem. The petiole usually has the same internal structure as the stem. Outgrowths appearing on each side of the petiole are called stipules. Leaves lacking a petiole are called sessile, or clasping when they partly surround the...

s are 6 mm - 8 mm long. The obovate samara

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...

e are < 20 mm long by 16 mm wide.