Diagnosis
A species is morphologically closely related to D. aristatum but
differing from it by the taller plant (50– 80 cm versus 15– 45 cm),
peduncle length (20– 40 versus 3– 10 cm), peduncle apex (curved and
bearded versus peduncle apex slightly curved, pubescent), spikes (always
one versus spikes two to six rarely one), stem (one versus one or more,
branched), basal nodes (without rooting versus rooting), inflorescence
(narrowly oblong versus broadly oblong to globose). Table 1 provides
detailed morphological comparisons with similar species.