parent_taxon anulocaulis
Anulocaulis is a small genus of flowering plants known generally as ringstems . These five species are sometimes treated as members of genus ___MASK99___ . Ringstems are thickly - rooted perennial wildflowers with glutinous brown bands at their stem internodes , the trait which gives them their common and Latin names . They bear tubular flowers at the tops of their stems . Ringstems are native to North America . ___MASK14___ , the four o ' clock family , is a family of around 33 genera and 290 species of flowering plants , widely distributed in tropical and subtropical regions , with a few representatives in temperate regions . The family has a unique fruit type , called an " anthocarp ", and many genera have extremely large (> 100 µm ) pollen grains . ___MASK99___ is a genus of over 100 species in the four o ' clock flower family , ___MASK14___ . Some species are annuals and others perennials . In habit they generally are herbaceous .