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Unformatted text preview: Greenhouse training Why do trees have bark?- protect long term investment- some photosynthetic- some have thorns One cacti from Africa mistletoe cactus (in hallway)- squeeze seed pods, little sticky black seeds come out Plants hanging that look kinda dead: all roots (epiphytes), tiny stem, occasionally flower Cacti room- thick cuticle, waxy, water storage, reduce surface/volume ratio- ribs/sphere shape allow shrink/swell (water absorption)- spines and chemicals to prevent predation- columnar common form too: reduce sun exposure; lots of hairs on top, like our heads- hairs reflect light and reduce water loss- lots of grafted cacti (red ball on top of columnar stem, for example)- echverias grow on coast where moist but its salty water or icy/snow (so not all cacti live in desert)- lithops living stones. Not cacti family, and all are from S. Africa (so old world, unlike everything else in room)- some bowl/round cacti are Fibonacci sequence- dead one that looks like a turtle shell: just dormant; a relative found in central...
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- Winter '07