Typically, botanical gardens and arboreta must have a full-time scientific staff, an herbarium and library, and a catalogued collection of thousands of plants. Although botanical gardens and arboreta may also have a public viewing area, in which case they may be listed as well under Public Gardens, it is the presence of a viable research faculty using an herbarium or herbaria which distinguishes botanical gardens and arboreta from public gardens. This tends to make botanical gardens and arboreta larger in size and more d- Category ID : 417169