calamus

A garden inclosed is my sister, my spouse; a spring shut up, a fountain sealed. Thy plants are an orchard of pomegranates, with pleasant fruits; camphire, with spikenard, Spikenard and saffron; calamus and cinnamon, with all trees of frankincense; myrrh and aloes, with all the chief spices

Thus, the four distinct feather parts that have been compared as to amino acid content to note whether or not the composition is uniform are rachis, barbs, calamus and medulla.