This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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...
View Full Document
- Winter '07
- Plants, water loss, Welwichia, columnar common form