Unlike many dicotyledons, a monocotyledon often has parallel leaf veins and a fibrous root system, which helps it adapt to different soils.
与许多双子叶植物不同,单子叶植物常具有平行叶脉和须根系,这有助于它适应不同的土壤环境。
Charles Darwin, On the Various Contrivances by Which British and Foreign Orchids Are Fertilised by Insects(达尔文《英国及外国兰花借昆虫受精的各种巧妙机制》):讨论兰科等单子叶植物的结构与繁殖适应。
Asa Gray, Manual of the Botany of the Northern United States(阿萨·格雷《美国北部植物学手册》):植物分类与形态描述中常使用 monocotyledon 等术语。
Arthur Cronquist, An Integrated System of Classification of Flowering Plants(克朗奎斯特《被子植物综合分类系统》):关于被子植物分类(含单子叶类群)的经典学术著作。