This rare and robust, new cycad species from Thailand has only recently been scientifically described as a new species.
It grows on Thailand's coldest mountains--the mountains in Loei in the north of Thailand--not far from the border
to Laos. On winter nights the temperature here drops well below freezing, occasionally even with snowfall, so this
species is well adapted to temperate and subtropical
climates. Cycas petraea will grow a trunk about 2 m (7 ft) tall. The leaves are short and flat with 32-40 dark green,
very glossy, and slightly waxy leaflets on either side and are carried on
a fairly long petiole. The seeds are unusually large at 3.5 to 5 cm (2 in)
long and 4 to 4.5 cm wide, making them among the biggest for cycads.