Titlebook: Early Evolution of Flowers; Peter K. Endress,Else Marie Friis Conference proceedings 1994 Springer-Verlag/Wien 1994 Flora.Flowers.evolutio

影响带来

https://doi.org/10.1007/978-981-10-1974-6., ., certain .), delimitation of the flower is not always clear and there is a more or less gradual transition between tepals and inflorescence bracts. Plasticity in floral form at this level of angiosperm evolution is predominantly encompassed by dimerous and trimerous cyclic floral organization a

dermatomyositis

f the staminal shield, with the stamen primordia projecting as flattened marginal extensions. The connective region of each stamen broadens markedly, resulting in wide separation of the sporangial pairs of each stamen. Just before anthesis, each connective arches outward so that the sporangia appear