The morphological characteristics of pollens provide important evidence for the classification and phylogenetic relationship research of Angelica (Apiaceae). The North American Angelica species are believed as an important group of the Angelica genus, but its pollen morphologies has rarely received attentions up to now. Aim to enrich further data of the palynological research, the authors observed the pollen morphology and exine ornamentation of 26 species and 44 populations of the Angelica genus in North America using optical microscopy and scanning electron microscopy. The SketchUp software was used to measure and define features such as polar axis and equatorial axis length, volume index, and ornamentation density of the pollen. The results show that: (1) There are four types of pollen shapes as subrectangular, ellipsoidal, hyperretangularb and hyperretangular (equatorial constriction). (2) Their polar axis length is 21.1-32.0 μm, the equatorial axis length is 10.6-17.1 μm, the ratio of polar axis to equatorial axis is 1.5-2.8, and the volume index is 15.8-23.3. (3) The ornamentations on exine walls of pollen equatorial regions includes three types, such as brevistriate baculite cerebroid, lone striate cerebroid, and flaky-like cerebroid, sparsely or densely arranged, and the polar ornamentations of three species turn to smooth. (4) According to the above characteristics of these pollens, a classification system comprising 4-levels, 3-classes and 15-subclasses are suggested herein. In general, the polymorphism of the pollen characteristics of North America Angelica species is lower than that in East Asia; the pollen shape and the types of the equatorial ornamentations of the exine walls are relatively consistent in each species, yet the central pollen protruding, ornamentation types and density, and appendages exhibit a certain intra-specific difference. The study supplies further data of the palynologies of Angelica, and the pollen characteristics will provide significant reference to the classification, identification and the relationships of these species, which are recommended as important supplement for the research on morphological and molecular taxonomy.