Trees On Stamps :

Montenegro
Nature Protection
May 23, 2014
The stamp depicts pine trees in Crna Poda.

The national tree is one of the subjects of the Philippines various series of "National Symbols" stamps issued from 1993-8. These are small, domestic rate sheet stamps, issued in a se-tenant format. This 1995 stamp shows the narra tree.

From Wikipedia, "Pterocarpus indicus (commonly known as Amboyna wood, Malay Paduak, Papua New Guinea rosewood, Philippine mahogany, Andaman redwood, Burmese rosewood, narra, angsana, or Pashu Paduak) is a species of Pterocarpus native to southeastern Asia, northern Australia,...China...Thailand, and Viet Nam...The hardwood, which is purplish, is termite-resistant and rose-scented."

Symbolic olive tree and oil vat, designed by Ali Bellagha (1924-2006), printed by lithography (Bruder Rosenbaum, Vienna), and issued by Tunisia on January 9, 1972 to commemorate International Olive Year, Scott No. 570.

- nethryk

"Tree of Life," and symbols of science and energy, an airmail stamp designed by French artist Pierre Béquet (1932-2012), printed by photogravure (Delrieu), and issued by Burkina Faso (then Upper Volta) on November 21, 1969 to publicize EuropAfrique, Scott No. C75.

- nethryk

On July 28, 1995 Japan issued a set of two "World Heritage" stamps. One of these stamps (Sc. #2451) depicts an old Japanese cedar, or Sugi tree (Cryptomeria japonica) which has been given the name "Jomon Sugi".

From Wikipedia, "Jomon Sugi is a large cryptomeria tree located on Yakushima Island, a UNESCO World Heritage Site, in Japan. It is the oldest and largest among the old-growth cryptomeria on the island, and is estimated to be between 2,170 and 7,200 years old.

Japan's April 18, 1997 stamp for "Philately Week" features the 1972 painting Daigo by Togyu Okumura (1889-1990). The painting depicts a blossum-filled, mature cherry tree, symbolic of the spring season. Stamp is Scott #2562.

From Wikipedia, "His original name was Yoshizo. The name Togyu referred to a poem from his father who ran a publishing business...Okumura's works are characterized by their unusual, exquisite quality of colors through the application of white gofun pigment 100 to 200 times as foundation."

Great Britain (Royal Mail)
5th June 1990
150th Anniversary of Kew Gardens

Stylized tree, Sun and Earth, designed by French artist Claude Durrens (1921-2003), engraved by André Frères (1902-1977), and issued by Central African Republic on April 20, 1964 to publicize International Quiet Sun Year (1964-1965), Scott No. 34.

- nethryk

Argentina
Forest Wealth - Trees
October 15, 1999
The stamp set depicts Lenga (Nothofagus pumilio), Caldèn (Prosopis caldenia), Quebracho colorado (Schinopsis balansae), and Ppetiribi (Cordia trichotoma).

Brazil
Buritis
December 19, 2013
The minisheet features buriti, an Amazonian palm tree that is of economic and environmental importance.

Bolivia
Environment Protection
September 21, 1994
2Bs: Molle (Schinus molle)
3.50Bs: Ceibo (Erythrina falcata)

Montserrat
Tropical Trees
October 28, 2009
The stamp set depicts Tamarind, Dwarf Coconut, Breadfruit Tree, Calabash Tree, Geiger Tree.

New Zealand
Definitive Issue - Scenery
March 27, 1996
Tane Mahuta, also called Lord of the Forest, is a giant kauri tree (Agathis australis) in the Waipoua Forest of Northland Region, New Zealand. Its age is estimated to be between 1,250 and 2,500 years. It is the largest kauri known to stand today.

Indigenous trees are depicted on these Finnish definitives of February 5, 1991. The 2.10 Mk. stamp was issued in traditional format (Facit #1127 C.) and in a self-adhesive miniature sheet of 10 (Facit #1127 O.). It depicts the European rowan, or mountain ash tree (Sorbus aucuparia) which was sacred to the ancient Finns.

The 3.50 Mk. stamp shows an European, or common oak (Quercus robber). This is the thickest tree in Northern Europe.

Japan
National Afforestation Campaign - Tottori
May 24, 2013
A pane of 10 stamps, one depicts Konara Oak (Quercus serrata), a deciduous oak tree native to eastern Asia.