Аннотация:Reproductive units of Centrolepis consist of a single stamen and 1‑30
carpels surrounded by 0‑3 tepal-like phyllomes. In most species of Centrolepis,
the main inflorescence axis bears two primary bracts, each typically subtending
a group of reproductive units arranged in a zigzag pattern. Two contrasting interpretations
of this zigzag arrangement have been proposed, either (1) a cincinnus,
or (2) a dorsiventral spikelet. Choosing between these two interpretations
is problematic because bracts subtending the reproductive units were previously
not observed in any species. We use evidence from a recently described species
from tropical Australia, C. racemosa, which possesses highly unusual inflorescence
morphology with solitary reproductive units in the axils of numerous
green bracts. Comparison between C. racemosa and another northern Australian
species, C. exserta, suggests that the zigzag arrangement of reproductive units
that is typical of most Centrolepis species should be interpreted as a dorsiventral
spikelet. Furthermore, additional investigation revealed rare inflorescences of
C. exserta with subtending bracts developed at the positions predicted by the
spikelet hypothesis.