genus helianthemum: widely distributed evergreen or semi-evergreen shrublets; America; Europe and North Africa to Asia Minor and central Asia
dilleniid dicot genus: genus of more or less advanced dicotyledonous trees and shrubs and herbs
monohybrid: a hybrid produced by crossing parents that are homozygous except for a single gene locus that has two alleles (as in Mendel's experiments with garden peas)