violet flower (viola) seed diagram and st. john’s wort (hypericum perforatum) cross section - 19th century - 胚乳 幅插畫檔、美工圖案、卡通及圖標
sweetshrub (calycanthus) and wintercress (barbarea vulgaris) embryo cross sections; convolute and accumbent cotyledon - 19th century - 胚乳 幅插畫檔、美工圖案、卡通及圖標