Arida parviflora, Arida riparia (R. L. Hartman) D. R. Morgan & R. L. Hartman Sida 20: 1410. 2003. Ronald L. Hartman, David J. Bogler Common names: Desert
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color, chromosome number, leaf morphology, and habitat (Morgan and Simpson; Morgan and R. L. Hartman 2003). Morphologic variation in Dieteria has resulted
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Syst. Bot. 17: 511–531. Morgan, D. R. 1997. Reticulate evolution in Machaeranthera (Asteraceae). Syst. Bot. 22: 599–615. Morgan, D. R. 2003. nrDNA external
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junceum, Xanthisma spinulosum (Nuttall ex Nees) D. R. Morgan & R. L. Hartman Sida 20: 1405. 2003. Ronald L. Hartman Basionym: Undefined sect. Sideranthus Nuttall
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grouping is well supported by molecular data (D. R. Morgan 1993, 1997, 2003; Morgan and Hartman 2003; Morgan and B. B. Simpson 1992). Although Xanthisma
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grindelioides, Xanthisma gypsophilum (de Candolle) D. R. Morgan & R. L. Hartman Sida 20: 1402. 2003. Ronald L. Hartman Basionym: Haplopappus sect. Blepharodon de
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Dieteria bigelovii var. mucronata (A. Gray) D. R. Morgan & R. L. Hartman Sida 20: 1394. 2003. David R. Morgan IllustratedEndemic Basionym: Aster bigelovii A
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Xanthisma spinulosum var. spinulosum (Pursh) D. R. Morgan & R. L. Hartman Sida 20: 1406. 2003. Ronald L. Hartman Common names: Cut-leaf ironplant spiny goldenweed
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genusArida speciesArida arizonica (R. C. Jackson & R. R. Johnson) D. R. Morgan & R. L. Hartman Sida 20: 1413. 2003. Ronald L. Hartman, David J. Bogler Common names:
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Blepharodon (de Candolle) D. R. Morgan & R. L. Hartman (D. R. Morgan and R. L. Hartman 2003)] within this widely defined Haplopappus. Clark, W. D. 1979. The taxonomy
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Symphyotrichum (J. C. Semple et al. 2002; D. R. Morgan 1997, 2003). Psilactis odysseus (G. L. Nesom) D. R. Morgan is the only species of the genus that does
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Machaeranthera tanacetifolia Nees Gen. Sp. Aster., 13, 224. 1832. David R. Morgan, Ronald L. Hartman Etymology: Latin machaera, sword, and anthera, anther, alluding
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genusArida speciesArida blepharophylla (A. Gray) D. R. Morgan & R. L. Hartman Sida 20: 1413. 2003. Ronald L. Hartman, David J. Bogler Common names: Gypsum tansy-aster
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grindelioides var. grindeloides (Nuttall) D. R. Morgan & R. L. Hartman Sida 20: 1403. 2003. Ronald L. Hartman Common names: Goldenweed gumweed aster Endemic
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genusArida speciesArida carnosa (A. Gray) D. R. Morgan & R. L. Hartman Sida 20: 1413. 2003. Ronald L. Hartman, David J. Bogler Common names: Shrubby alkali
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Astereae genusArida speciesArida riparia (Kunth) D. R. Morgan & R. L. Hartman Sida 20: 1414. 2003. Ronald L. Hartman, David J. Bogler Common names: Chiricahua
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genusArida speciesArida parviflora (A. Gray) D. R. Morgan & R. L. Hartman Sida 20: 1414. 2003. Ronald L. Hartman, David J. Bogler Common names: Small-flower
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Xanthisma viscidum (R. C. Jackson) D. R. Morgan & R. L. Hartman Sida 20: 1410. 2003. Ronald L. Hartman Basionym: Haplopappus sect. Havardii R. C. Jackson Univ
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(B. L. Turner) D. R. Morgan & R. L. Hartman Sida 20: 1393. 2003. David R. Morgan Endemic Basionym: Machaeranthera asteroides var. glandulosa B. L. Turner
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genusPsilactis speciesPsilactis heterocarpa (R. L. Hartman & M. A. Lane) D. R. Morgan Syst. Bot. 18: 301. 1993. David R. Morgan EndemicConservation concern Basionym:
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