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Key messageAn unusual polyadoccursin threeParkiaspecies, named cavitate polyad. It has an internal central space full of lipoproteinsubstances, contacting all pollen grains, probably aiding pollen germination. Abstract This study details the unusual morphology of polyads of three species of Parkia (P. multijuga Benth., P. ulei (Harms) Kuhlm., and P. pendula (Willd.) Benth. ex Walp.)...
Calliandra brevipes Benth. is an American shrubby species largely used for ornamental purposes. Like all other Calliandra species it has heteromorphic pollen grains shed in ellipse-shaped, calymmate polyads and a unique mode of pollen presentation by producing a sticky substance called ''pollen adhesive''. The present study aimed to investigate in detail the origin of polyad adhesive in C. brevipes...
Research documents related to the morphology and function of style branches and stigmatic surface of Asteraceae are still rather few, and the literature reports are thus controversial. We report in the present study that the stigmatic surfaces of two non-related species of Asteraceae (Lessingianthus grandiflorus and Lucilia lycopodioides) have features of semidry stigmas. Sporodermis of both species...
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