Communities visited with site descriptionsThese are all of the communities used in the analyses with site descriptions.AllSites copy.csvClarkia_AccessionsDescription of samples used to generate the Clarkia phylogeny.Clarkia_CooccurMtrx_1mClarkia co-occurrence matrix at 1 meter scale.Clarkia_CooccurMtrx_30mClarkia co-occurrence matrix at 30 meter scale.Clarkia_CooccurMtrx_100mClarkia co-occurrence matrix at 100 meter scale.ClarkiaTraitsDataframe with species level trait values for Clarkia.Lim_CooccurMtrx_1mLimnanthes co-occurrence matrix for 1 meter scale.Lim_CooccurMtrx_30mLimnanthes co-occurrence matrix for 30 meter scale.Lim_CooccurMtrx_100mLimnanthes co-occurrence matrix for 100 meter scale.LimTraits copySpecies level trait values for Limnanthes species in study.Mim_CooccurMtrx_1mMimulus co-occurrence matrix for 1 meter scale.Mim_CooccurMtrx_30mMimulus co-occurrence matrix for 30 meter scale.Mim_CooccurMtrx_100mMimulus co-occurrence matrix for 100 meter scale.MimTraitsFloral copyMimulus species floral trait values.MimTraitsVeg copyMimulus species vegetative trait values.Clarkia consensus treeClarkia consensus treeClarkia.consensusClarkia treesClarkia TreesClarkia.treesLimnanthes consensus treeLimnanthes consensus treeLimnanthes.consensusLimnanthes treesLimnanthes treesLimnanthes.treesMimulus consensus treeMimulus consensus treemimulus.consensusMimulus treesMimulus treesmimulus.treesClarkia_chain1Log file for chain 1 for Clarkia phylogenyClarkia_chain2Log file for chain 2 for Clarkia phylogenyClarkia_chain3Log for chain 3 for Clarkia phylogenyClarkia_chain4Log file for chain 4 for Clarkia phylogenyLimnanthes_chain1Log file for chain 1 for Limnanthes phylogenyLimnanthes_chain2Log file for chain 2 for Limnanthes phylogenyLimnanthes_chain3Log file for chain 3 for Limnanthes phylogenyLimnanthes_chain4Log file for chain 4 for Limnanthes phylogenymimulus_chain1Log file for chain 1 for Mimulus phylogenymimulus_chain2Log file for chain 2 for Mimulus phylogenymimulus_chain3Log file for chain 3 for Mimulus phylogeny

Community assembly is the result of multiple ecological and evolutionary forces that influence species coexistence. For flowering plants, pollinators are often essential for plant reproduction and establishment, and pollinator-mediated interactions may influence plant community composition. Here, we use null models and community phylogenetic analyses of co-occurrence patterns to determine the role of pollinator-mediated processes in structuring plant communities dominated by congeners. We surveyed three species-rich genera (Limnanthes, Mimulus, and Clarkia) with centers of diversity in the Sierra Nevada of California. Each genus contains species that co-flower and share pollinators, and each has a robust phylogeny. Within each genus, we surveyed 44-48 communities at 3 spatial scales, measured floral and vegetative traits, and tested for segregation or aggregation of: 1) species, 2) floral traits (which are likely to be influenced by pollinators), and 3) vegetative traits (which are likely affected by other environmental factors). We detected both aggregation and segregation of floral traits that were uncorrelated with vegetative trait patterns; we infer that pollinators have shaped the community assembly although the mechanisms may be varied (competition, facilitation, or filtering). We also found that mating system differences may play an important role in allowing species co-occurrence. Together, it appears that pollinators influence community assemblage in these three clades.