Sentence:  The number of spikelets is variable, and some genera have <WSD>thyrses</WSD> with 70 spikelets ("Saxofridericia", "Spathanthus") or only 1-3 spikelets per inflorescence ("Stegolepsis", "Monotrema"). 
Meaning of the word marked with <WSD> tags:  A type of inflorescence; a compact panicle having an obscured main axis and cymose subaxes.