Gallery

fruit

seeds

seeds

marginal view of seeds

A, seed; B, longitudinal section of seed showing embryo; C, transection of seed; drawing by Lynda E. Chandler

hilum of seed

surface reticulation of seed

fruit

sterile leaflets; www.flickr.com/photos/flowerfreak/ CC BY-NC-ND 2.0

fertile leaflets; www.flickr.com/photos/tony_rodd/ CC BY-NC-SA 2.0

sterile leaflets (top side, left) and fertile leaflets (underside); photo: Peggy Greb, USDA ARS, Bugwood.org

fertile leaflet, detail; photo: © Amy Ferriter, State of Idaho, Bugwood.org

fern overtaking cypress trees in southern Florida; photo: Peggy Greb, USDA ARS, Bugwood.org

seeds

seeds, detail

seeds

seeds

truncate hilar area of seeds

truncate hilar area of seeds

infertile seeds

infertile seeds

opened fruit showing numerous seeds

A, seed; B, longitudinal section of seed showing embryo; C, transection of seed drawing by Lynda E. Chandler

fruit

achene

achene, detail

A, achene; B, achene outline showing entire pappus; C, longitudinal section showing embryo; D, transection of achene; drawing by Lynda E. Chandler

apex of achene

scar of achene

achenes

achene, detail

A, achene; B, achene outline showing entire pappus; C, longitudinal section showing embryo; D, transection of achene; drawing by Lynda E. Chandler