Iris ( Ivor Knowles Iris )
Rhizomatous iris have rhizome as rootstocks , closely to or on the surface , or just below ground - level , which produce linear to sword - shaped farewell , almost always in basal fans , and unsubdivided or biramous prime stems . The flowers have 3 unsloped petals , called standards , and 3 large , pendent or spreading petals , promise waterfall . Pacific Coast group iris miss the “ beard ” of dark hairs at the base of each dusk that other iris groups have ....