Achillea grandiflora, Bieb. A smooth and erect perennial: lvs. narrowly linear, narrower than in any of the Ptarmica group, distinctly serrulate: corymbs simple or sometimes loosely branched, the peduncles 4-5 times longer than the head; fls. white, large and more showy than most of the genus, longer than the bracts of the involucre. Sub-alpine and scarcely good for ordinary garden conditions. Caucasus. June, July.