Great Basin Naturalist


A revision of the sunflower family, Compositae (Asteraceae), is presented for the state of Utah. Included are 613 taxa in 100 genera. Keys to genera, species, and infraspecific taxa are provided, along with detailed descriptions, distributional data, and pertinent discussion. Many nomenclatural changes have been necessary to bring Utah composites into line with contemporary interpretations of the family. They include: Artemisia tridentata Nutt. var. wyomingensis (Beetle & Young) Welsh; Aster kingii D.C. Eaton var. barnebyana (Welsh & Goodrich) Welsh; Brickellia microphylla (Nutt.) Gray var. watsonii (Robins.) Welsh; Chrysothamnus nauseosus (Pallas) Britt. — var. abbreviatus (Jones) Welsh, var. arenarius (L.C. Anderson) Welsh, var. glareosus (Jones) Welsh, var. iridis (L.C. Anderson) Welsh, and var. nitidus (L.C. Anderson) Welsh; Cirsium arizonicum (Gray) Petrak var. nidulum (Jones) Welsh; Cirsium calcareum (Jones) Woot. & Standl. — var. bipinnatum (Eastw.) Welsh and var. pulchellum (Greene) Welsh; Cirsium neomexicanum Gray var. utahense (Petrak) Welsh; Cirsium undulatum (Nutt.) Spreng. var. tracyi (Rydb.) Welsh; Crepis runcinata (James) T. & G. var. glauca (Nutt.) Welsh; Erigeron speciosus (Lindl.) DC. — var. mollis (Gray) Welsh and var. uintahensis (Cronq.) Welsh; Gutierrezia petradoria (Welsh & Goodrich) Welsh; Gutierrezia pomariensis (Welsh) Welsh; Haplopappus racemosus (Nutt.) Torr. — var. sessiliflorus (Greene) Welsh and var. prionophyllus (Greene) Welsh; Haplopappus watsonii Gray var. rydbergii (Blake) Welsh; Lygodesmia grandiflora (Nutt.) T. & G. — var. arizonica (Tomb) Welsh and var. dianthopsis (D.C. Eaton) Welsh; Machaeranthera canescens (Pursh) Gray — var. commixta (Greene) Welsh, var. leucanthemifolia (Greene) Welsh, and var. vacans (A. Nels.) Welsh; Petradoria pumila (Nutt.) Greene var. graminea (Woot. & Standl.) Welsh; and Senecio spartioides T. & G. var. multicapitatus (Greenm. in Rydb.) Welsh.