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Systematics of the amphi atlantic bambusoid genus streptogyna poaceae



Systematics of the amphi atlantic bambusoid genus streptogyna poaceae



Annals of the Missouri Botanical Garden 74(4): 871-888



Streptogyna is the only herbaceous bamboo genus with an amphi-Atlantic distribution. Streptogyna crinita occurs in tropical Africa, Sri Lanka, and India, and S. americana is found throughout the Neotropics. Although marked differences in habit and in morphology of lodicules and starch grains suggest segregation at the generic levels, they are here retained ina single genus because they are quite similar in spikelet morphology and leaf anatomy. Multicellular microhairs are present on the lodicules of S. crinita and mark the first report of microhairs in the genus. Multicellular microhairs are otherwise well developed in the grasses only in the African herbaceous bamboo Guaduella, and they may be a primitive feature in the family as they are common in its putative outgroup, the Joinvilleaceae. Streptogyna shows strong bambusoid affinities in its ligule and leaf anatomy, spikelet structure, caryopsis and embryo morphology, and chromosome number, but differs from the core group of the subfamily in its seedling morphology and lack of epidermal papillae. Autapomorphies in the two species suggest that neither could have been derived directly from the other.

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Accession: 006574665

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