Linnaeus' six species of "Azalea" were "Azalea indica", "A. pontica", "A. lutea", "A. viscosa", "A. lapponica" and "A. procumbens" (now "Kalmia procumbens"), which he distinguished from "Rhododendron" by having five stamens, as opposed to ten. As new species of what are now considered "Rhododendron" were discovered, they were assigned to separate genera if they seemed to differ significantly from the type species. For instance "Rhodora" (Linnaeus 1763) for "Rhododendron canadense", "Vireya" (Blume 1826) and "Hymenanthes" (Blume 1826) for "Rhododendron metternichii", now R. degronianum. Meanwhile, other botanists such as Salisbury (1796) and Tate (1831) began to question the distinction between "Azalea" and "Rhododendron", and finally in 1836, "Azalea" was incorporated into "Rhododendron" and the genus divided into eight sections. Of these "Tsutsutsi" ("Tsutsusi"), "Pentanthera", "Pogonanthum", "Ponticum" and "Rhodora" are still used, the other sections being "Lepipherum", "Booram", and "Chamaecistus". This structure largely survived till recently (2004), following which the development of molecular phylogeny led to major re-examinations of traditional morphological classifications, although other authors such as Candolle, who described six sections, used slightly different numeration.