commelinidae: one of four subclasses or superorders of Monocotyledones; comprises about 19,000 species in 25 families of mostly terrestrial herbs especially of moist places including: Cyperaceae; Gramineae; Bromeliaceae; and Zingiberaceae
class: (biology) a taxonomic group containing one or more orders
driver: a golf club (a wood) with a near vertical face that is used for hitting long shots from the tee