When I was a child we would collect fall leaves and press them between wax paper to preserve the colors. We collected mostly Oak and Maple leaves because those were the trees that were planted along the road side and easy to pickup from the sidewalk while walking home from school.
At the Folk School we collected several types of Oak and Maple leaves: White Oak, Scarlet Oak, Sawtoothed Oak, Post Oak, Chestnut Oak, Red Maple, Silver Maple, and Striped Maple leaves. We found several leaves that were still green or just beginning the transition. The color change can be triggered by length of daylight or a temperature change. We had a cold snap the night we arrived, and each day after that more an more leaves started turning colors.
Sawtoothed Oaks have a three to seven inch long leaf that is lanceolate shaped, with a bristle-tipped tooth at the end of each vein. They were all still a dark shiny green. The acorns are oval and the very scaly cap covers 1/2 the bicolored acorn.
Post Oaks leaves turn a rustic orange brown. The leaves are six to ten inces long with five rounded lobes. The middle loves are distinctly square. Before turning, the thick green leaves are paler and pubescent below. The oval acorns have bowl-shaped scaly caps that cover 1/3 to 1/2 of the acorn.
Chestnut Oak leaves resemble a four to six inch long Chestnut tree leaf. They are shiny green above and paler below. The acorns are oval and as they mature separate from the thin warty cap.
samaras (another word of the day).
Silver Maples are more of a soft yellow-orange in color. The leaves are palmate with coarse serrate margins. There are five deeply sinused lobes. The underside of the leaf is pale silvery white. The long petioles allow even a light breeze to flash the leaves silver undersides.
Striped Maples leaves turn a pale yellow. The leaves have three lobes with serrated margins and long drip tips that cause the leaf to resemble a goose foot.