Trees On Stamps :

Scott # 667 from Djibouti
Commiphora species, the resin of which produces Myrrh, used as incense for thousands of years. The three wise men brought gifts of gold, frankincense and myrrh - 2 of the 3 most valuable items in the world 2000 years ago were tree resin.
One of my favorites because of its beauty, but it is also one of those stamps that is not rare, but certainly scarce - it took me years to find one.

Here is the 25 (pf) value (Mi #2205) from the DDR's February 23, 1977 set of five "Natural Monuments" stamps. The stamp depicts a tree from the Ivernack Oak Park in Germany's northeastern Mecklenburg-West Pomeranian region.

From dw.com, "The Ivernack Oaks arose during the Middle Ages when the area was used as a wood pasture for livestock. The largest oak in the park is 3.49 meters (11.45 ft) wide and 35.5 meters tall, and is estimated to be up to 1000 years old."

Singapore
Know Ten Trees
May 26, 2010
This booklet stamp set depicts Angsana, Sea Almond, Senegal Mahogany, Broad-leafed Mahogany, Sea Apple, Trumpet Tree, Saga, Rain Tree, Yellow Flame, Tembusu.

On April 29, 1964 the USA issued this 5c stamp (Sc #1245) to commemorate the 50th anniversary of the death of naturalist and conservationist John Muir (1838-1914). Muir is shown walking among the coastal redwoods (Sequoia sempervirens), the tallest living things on planet Earth.

From the USPS, "Muir spent most of his adult life in California, and a large part of his fame rests on his successful crusade to save California's giant redwoods."

Here is the 12c value from British Guiana's 1954 QEII pictorial definitive series. Stamp depicts a greenheart tree (Chlorocardium rodiei) being felled. This species is native to Guyana and Surinam.

From wikipedia, "The wood is extremely hard and strong, so hard that it cannot be worked with standard tools. It is durable in marine conditions, so it is used to build docks and other structures."

On April 26, 2001 Guernsey issued a 10-stamp (2 x 5 designs) booklet themed "Island Views". Stamps are denominated "GY" (local, 22c at date of issue) rate. One of stamps (Sc #742b) is inscribed "Rue des Hougues" and depicts three trees at sunrise, or sunset. Internet pics of Rue des Hougues show a narrow road through green and flat open country. Hougues is an old family name from Brittany, France.

From gg.geowiew.info, "Rue des Hougues has a length of 0.65 kilometers."

Here is the .60 bolivianos value (Sc #717) from Bolivia's September 26, 1988 two-stamp set commemorating the 50th anniversary of Pando Department (State). Pando Department is the northernmost department of Bolivia. It is in the Amazon Rainforest and borders Peru and Brazil. Stamp depicts a man tapping a rubber tree.

From wikipedia, "The department had a rubber boom in the late 19th and early 20th century...The local industry collapsed under competition with rubber cultivated in Southeast Asia, as well as the discovery and manufacture of synthetic rubber."

On November 28, 1978 Malaysia issued a three-stamp set commemorating the centenary of the rubber industry. The 20c value (SG #185) of the set, shown here, graphically depicts the two methods used for germination of rubber trees. Left side of the stamp shows germination from a seed, and right side of the stamp depicts the "maxi stump" method.

From Natural Rubber: Biology, Cultivation and Technology by M. R. Sethuraj and Ninan T. Mathew, "For planting maxi stumps, shallow pits of 30 cm depth can also be used. In such cases a small cavity is made at the bottom of the planting hole with a crowbar to accommodate the end of the tap root (Rubber Research Institute of Malaysia, 1976)."

This 60 lire value (Sc #742) of Italy is from a set of three stamps issued on May 9, 1958 commemorating the 10th anniversary of the Italian Constitution. An oak stump is shown sprouting new branches, symbolizing a rebirth of the country.

A posting on page 9 of this thread features an older, post-WWII Italian stamp using the same imagery in a different style.

Here is France's September 22, 1991 2.50 fr stamp (Sc #2265) commemorating the Tenth World Forestry Congress. The conference was held in Paris from September 17-26 and included more than 2500 participants from 136 countries.

On February 23, 2008 Estonia issued this 5.50 kroon/.35 euro stamp (Sc #590 to commemorate the 90th anniversary of the Republic of Estonia. Stamp depicts an oak tree. Although not officially recognized as the national tree, the oak has long been specially regarded there. Also, note that the branch and leaf after "EESTI" form a "90".

From wikipedia, "Oak, for example, has long been regarded as a sacred tree. Estonia lies in the northernmost zone of its occurrence...ancient Estonians planted oaks in their holy places. The supreme god was Taara. He was celebrated in sacred oak forests around Tartu."

This March 12, 2015, 55 eurocent stamp (Sc #781) of Estonia shows the coat of arms (adopted in 2000) of the city of Elva (pop. 5700) in the southeast of the country. The two stamps show the color range of the issue.

From elva.com, "Elva is also known as 'pine town'. One such single but powerful tree is the Arbi pine-tree which is a symbol of town and has been portrayed on the coat of arms. The coat of arms symbolizes the fresh air and water resources we have, as well."

A stamp from Mayotte depicting Jackfruit. Scott # 183 from 2002. I know of no other stamps that depict the world's largest fruit. Big enough to kill you if you walk under a tree and one falls on your head.

Great posting Stampdoc!

Singapore's $2 value from its 1973 definitive series shows a jackfruit.

On September 10, 1981 Denmark issued this 2.00 + .20 kr semipostal charity stamp (Facit #765) to commemorate the UN's "1981: The International Year of Disabled Persons". Stamp shows a tree with both fresh and dry branches.