BIOL 1130 Lecture Notes - Monocotyledon, Cyperaceae, Egg Cell
27 Sep 2013
School
Department
Course
Professor
Document Summary
Fruits dry and don"t split: achene only the base of seed (single) is attached to the pericarp, grain (caryopsis) embryo is united with the endosperm. Corn, rice, wheat: nuts resemble achenes but are larger. Bracts at their base: schizocarp -twin fruit, which break into 2 segments upon dryland. Dilly: samaras pericarp extends outwards in a wing shape. Multiple pistils each develop a small fruit and mature at a cluster. Develop into several individual flowers in an inflorescence. Each flower is independent but they develop jointly resembling a single fruit. Wind: maple samara caught by wind, plumes calyx is modified into a feathery appearance - dandelion, minute - orchids, wind blows mature plant is severed from the root blown away tumble weed. Wednesday november 14, 2012: pass through digestive tract and still remain viable, hooks, barbs stick to fur of animals, human disturbance ornamentals, aquatic exotics. Some seeds have air pockets in them that permit them to float to new habitats.
