BIOL 2P93 Lecture Notes - Lecture 32: Starch, Myrmecochory, Fruit Anatomy
24 Jan 2016
School
Department
Course
Professor
Document Summary
+ elms (ulmus sp. retains 1 seed at maturity + dispersed by wind. Small, dry indehiscent fruits of dandelions (cypselas) loosely called achenes: derived from inferior ovary + have modified plume-like calyx (pappas) + wind dispersed. Maple (acer sp. ) consider to be schizocarp b/c splits into. But b/c of wing on each seed-bearing carpel = double samara. Maples: each half of schizocarp has long wing. fruits of. Dandelion on right have modified calyx (pappas) which adheres to mature cypsela = plume-like structure aids in wind dispersal. Fruits + seeds evolved in relation to dispersal agents: many plants have wind-borne fruits + seeds. Some plants: light fruit/seeds dispersed by wind, others have wings allow blown from place-place (maple schizocarps: each carpel develops long wing). Many members of asteraceae (i. e. dandelions) develop plume-like pappas helps dispersal. Willows + poplars: seed coat covered in woolly hairs. Tumbleweeds: whole plant blown along by wind, scattering seeds as it moves.
