Quebracho – 2 items

Quercus – 19 items

Quiina – 1 item

Quince – 1 item

Radish – 4 items

Raffia – 2 items

Rafflesia – 1 item

Rainforests – 4 items, including Christian Science Monitor 1982 “Making sure the world hears when a tree falls in the forest.”

Raisins – 6 items

Ramie – 6 items, including Boston Sunday Herald “Ramie Claimed to be Oldest Textile in Use by Man.”

Raspberries – 4 items

Rattan – 3 items

Rauwolfia – 6 items

Ravenala – 6 items, including Chicago Natural History Museum Bulletin 1947 “A rare tropical plant is found by museum botanist.”

Rayon – 19 items, including Scientific American 1926 “The Latest Member of Our Textile Family.”

Rennets – 3 items

Reseda – 1 item

Resins – 13 items, including Boston Evening Transcript 1929 “The Gum Digger Days are Gone.”

Rhamnus – 2 items

Rhinanthus – 1 item

Rhododendron – 3 items

Rhubarb – 14 items

Rhus – 26 items, including Horticulture 1929 “Poison Ivy and Poison Sumac.”

Ribes – 8 items

Rice 1 (up to 1950s) – 33 items

Rice 2 – 33 items, including New York Times 1972 “Asian Countries Fear a Rice Glut.”

Ricinus – 21 items, including Scientific American 1919 “The Castor Bean and Its Many Uses.”

Robina – 6 items, including American Forestry 1917 “Black Locust Needed for Ships”.

Rocella – 1 item

Rope – 3 items

Roripa – 2 items

Rosa – 12 items, including a letter with four photographs from J.C. Boyd in 1962 of otto of rose distillation in Bulgaria.

Root Crops – 4 items

Rubber 1 (before 1920s) – 71 items, including The Agriculture News 1909 “The Tonkin Rubber Tree.”

Rubber 1 Continued – 25 items, many concerning Mr. Henry Wickham, a key contributor to the rubber industry.

Rubber 2 – 32 items, including The New York Times 1943 “We Tame a Jungle to Get Our Rubber.”

Rubber 2 Continued – 25 items, including The India–Rubber Journal 1925 “Rubber Shoe Making in 1876.”

Rubber 3 (1930s) – 36 items, including Science–Supplement 1938 “The Increasing Use of Rubber,” Science 1936 “Rubber content of Goldenrod leaves affected by light,” The Boston Sunday Post 1937 “Auto Made Possible by Rubber.” Science 1933 “Research Stretches Rubber to New Uses as Textile.”

Rubber 3 Continued – 12 items, including The India–Rubber Journal 1911 “The Rubber–Smoking House at Singapore Botanic Gardens.”

Rubber 4 (1940s) – 69 items, including New York Herald Tribune 1942.

Rubber 5 – 74 items, including The New York Herald Tribune 1942 “Taking the Rubber Situation to Heart,” The Boston Daily Globe 1942 “Discover No Quick Source of Natural Rubber,” The Boston Herald 1942 “Rubber Shortage So Desperate Bus Lines Face Curtailment,” The Boston Herald 1942 “Text of Roosevelt’s Scrap Rubber Plea,” Boston Traveler 1942 “No More Tires Until 1945.”

Rubber 6 (1940s) – 52 items, including Boston Sunday Post 1948 “New trees developed for rubber,” Boston Herald 1940 “Wild Rubber Found on Orinoco May Solve U.S. Problem,” The Boston Daily Globe 1942 “Rubber Is Prize in Fierce Brazilian Jungle Warfare.”

Rubber 7 (1950s–1980s) – 13 items, including New Scientist 1981 “The state of rubber,” Arnoldia 1984 “The Tree that Changed the World in One Century” by Richard Evans Schultes, The New York Times 1981 “Extending the Uses of the Rubber Band.”

Rubber – Brazilian Propaganda – 58 items, including several cartoons illustrating the rubber shortage, The American Weekly 1942 “Cheer Up, There’s Rubber in Those Dandelions,” Science–Supplement 1948 “Discovery of Rubber in Decayed Bark,” Boston Traveler 1942 “New Source of Rubber Found in South Africa.”

Rubber – Brazilian Propaganda – 35 items, some duplicates, mostly pamphlets written in Portuguese.

Rubber Substitute – 9 items, including Industrial Research 1964 “Metamorphosis in Rubber,” The Cuba Review 1909 “Rubber Substitute from Cacti.”

Rubber – Synthetic – 61 items, including Science – Supplement 1943 “A New Synthetic Rubber,” The Florida Times–Union 1943 “Way is found to get synthetic rubber from Florida sugar cane,” Boston Herald 1942 “U.S. To Spend 400 Million for Rubber.”

Rubber Misc. – 3 folders.

Rubus – 14 items, including The Garden 1925 “Rubus quinqueflorus.”

Ruta – 2 items.

Rye – 3 items.