Articles: PubMed: Evidence-based medicinal value of Rudbeckia hirta L. flowers. PubMed: Wild bees preferentially visit Rudbeckia flower heads with exaggerated ultraviolet absorbing floral guides. PubMed: A new highly oxygenated pseudoguaianolide with 5-LOX inhibitory activity from Rudbeckia hirta L. flowers. PubMed: Indirect effects on mutualisms: parasitism of bumble bees and pollination service to plants. PubMed: Profiling the chlorogenic acids of Rudbeckia hirta, Helianthus tuberosus, Carlina acaulis and Symphyotrichum novae-angliae leaves by LC-MS(n). PubMed: Formation of UV-honey guides in Rudbeckia hirta. PubMed: Nonstomatal versus stomatal uptake of atmospheric mercury. PubMed: Growth and Landscape Performance of Ten Herbaceous Species in Response to Saline Water Irrigation. PubMed: Management of lesion nematodes and potato early dying with rotation crops. PubMed: Mercury accumulation in grass and forb species as a function of atmospheric carbon dioxide concentrations and mercury exposures in air and soil. PubMed: Monoclonal antibodies against an arabinogalactan-protein from pressed juice of Echinacea purpurea. PubMed: The Effect of Marigolds (Tagetes spp.) and Other Cover Crops on Pratylenchus penetrans and on Following Potato Crops. PubMed: The Potential of Thiarubrine C as a Nematicidal Agent against Plant- parasitic Nematodes. PubMed: The complex nature of the mechanism of toxicity of antibiotic dithiacyclohexadiene polyines (thiarubrines) from the asteraceae. PubMed: Plant regeneration from protoplasts of Dimorphotheca and Rudbeckia. PubMed: Flavonols: pigments responsible for ultraviolet absorption in nectar guide of flower. PubMed: Pigments of Yellow-Eyed Races of the Black-Eyed Susan (Rudbeckia Hirta). PubMed: Pigments of yellow-eyed races of black-eyed susan, Rudbeckia hirta.