Long-Leaved Tansy is an erect perennial herb with much dissected leaves
and a dense rounded cluster of large yellow flower-heads at the top.
Flower cluster is sometimes shortly branched. Flower-heads are several,
0.8-1.5 cm across, with hairy bracts with brown purple margins. Leaves are
12-25 cm long, usually gray-green, armomatic, oblong in outline, twice cut
into narrow linear pointed segments. Basal leaves are long-stalked. Stem
is robust, 15-30 cm tall, emerging from a rootstock which is crowned with
old leaf bases. Long-Leaved Tansy is found in the Himalayas, from Kashmir
to W. Nepal and SW China, at altitudes of 3300-4400 m.
Flowering: July-September.