The lower valve of the calyx turned to the rhachis is more than twice as small as the upper.
rhachis hairy at the base of the flowers, ending in a naked pedicel.
Spikelets 3–12-flowered, somewhat terete, the rhachis with bearded joints; terminal flower abortive.
rachis ra·chis (rā'kĭs)
n. pl. ra·chis·es or rach·i·des (rāk'ĭ-dēz', rā'kĭ-)
See spinal column.