Growing in clusters

WordNet Word definitions in WordNet
adj. having stalked flowers along an elongated stem that continue to open in succession from below as the stem continues to grow; "lilies of the valley are racemose"

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Racemose \Rac"e*mose`\ (r[a^]s"[-e]*m[=o]s`), a. [L. racemosus full of clusters.] Resembling a raceme; growing in the form of a raceme; as, (Bot.) racemose berries or flowers; (Anat.) the racemose glands, in which the ducts are branched and clustered like ...

Wiktionary Word definitions in Wiktionary
a. 1 (context botany English) Having flowers arranged along a single central axis, as in a raceme, spike, or catkin. 2 (context pathology of a disease English) expressing such a pattern