life
cycle – perennial,
reproducing by seed and rhizomes
stems – upright,
stout, hollow, single or multiple from base, sparsely branched,
smooth, prominent swollen nodes growth habit 1
, growth habit 2, nodes
leaves – opposite,
oval to lanceolate, short stalked or sessile, margin entire
and often wavy, smooth, three prominent parallel veins leaves 1, leaves 2
flowers – 5-petaled,
white to pink sometimes rose, petal tips notched, fragrant,
sepals united to form tube; tight clusters terminal and axillary
above flowers 1, flowers 2, flowers 3, flowers 4, flowers 5, flowers 6
