Pollen Morphology in the Polemoniaceae

Twenty-six pollen types have been described from among 144 species investigated. The descriptions are supplemented by a table (with NPC-classification and short descriptions; see p. 200). For the determination of the pollen grains a key (p. 208) has been made. The relationships between genera, sections, and tribes are adumbrated in Fig. 1 (p. 198).