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Sex Expression and the Evolutionary Advantages of Male Flowers in an Andromonoecious Species, Sagittaria guyanensis subsp. lappula (Alismataceae) A new quinolone alkaloid with antibacterial activity from Lappula echinata Effects of coumarin from LEG on contractivity in isolated rabbit ileum Some new floristic findings in Xinjiang, China New Taxa of Lappula from China HISTOCHEMICAL CHANGES IN SEED GERMINATION PROCESS OF SAGITTARIA GUYANENSIS SUBSP.LAPPULA FLORALORGANOGENESISOFSAGITTARIA GUAYANENSISSSP.LAPPULA ——WITH ADDITIONALREFERENCETOITS RELATIONSHIPWITH THERELATIVEGENERA Embryological Studies on Sagittaria guayanensis H. B. K. Subsp. lappula (D. Don) Bojin (Alismataceae)