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- W2002752589 abstract "The pollen morphology of 65 species of Tournefortia L. was examined by light, scanning, and transmission electron microscopy. Four distinct morphological types were found: Type I, grains subprolate with 3‐colporate apertures alternating with three pseudocolpi and the ektexine psilate; Type II, grains subprolate, the poles expanded, 3‐colporate with the ektexine psilate polarly and verrucate equatorially; Type III, grains spheroidal with three porate apertures and the ektexine clavate; Type IV, grains suboblate with 3–4 colporate apertures and the ektexine psilate to finely rugose. Type I was found in 46 species representing the most diverse group of tournefortias. Type II was found in 12 species from the Old and New Worlds representing two related groups. Type III was found in five closely related species from the American tropics. Type IV was found in two species from South America, but differences in both the pollen and sporophyte indicate that this grouping may be artificial. Pollen morphology does not support the separation of those species treated as Messerschmidia and confirms the close relationship of Tournefortia and Heliotropium. The striking morphological divergence of Tournefortia pollen raises the question of its adaptive significance." @default.
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- W2002752589 date "1974-10-01" @default.
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- W2002752589 title "A PALYNOLOGICAL INVESTIGATION OF THE GENUS TOURNEFORTIA (BORAGINACEAE)" @default.
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- W2002752589 doi "https://doi.org/10.1002/j.1537-2197.1974.tb14042.x" @default.
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