Trans. Amer. Philos. Soc., n. s.7: 317–318. 1840
e United States, se Mexico, Bahamas, Central America (Belize, Guatemala, Honduras).
Species 7 (7 in the flora).
Pityopsis has been treated historically as a distinct genus or as a section of Chrysopsis (A. Gray 1884) or Heterotheca (L. H. Shinners 1951e). J. C. Semple (1977) and Semple et al. (1980) presented cytologic, morphologic, and anatomic reasons for treating Pityopsis, Chrysopsis, and Heterotheca as separate genera. Semple and F. D. Bowers (1985) monographed the genus; their treatment is followed here. Semple and Bowers (1987) reported on the distribution of ploidy levels within the genus. In a preliminary cladistic study of the Chrysopsidinae, Pityopsis was consistently separate from Chrysopsis and Heterotheca (Semple and L. Tebby 1999). L. Brouillet (pers. comm.) noted that DNA sequence data also indicate that Pityopsis is separate from Chrysopsis and Heterotheca. Semple and J. L. A. Hood (2005) described additional differences among the pappi of Chrysopsis, Heterotheca, and Pityopsis.
Semple, J. C., V. Blok, and P. Heiman. 1980. Morphological, anatomical, habit and habitat differences among the goldenaster genera Chrysopsis, Heterotheca and Pityopsis (Compositae–Astereae). Canad. J. Bot. 58: 164–171.
|1||Basal leaves usually longer than cauline, grasslike, faces sericeous||> 2|
|1||Basal leaves shorter than cauline, mid and distal similar in size, not grasslike or only somewhat so (in P. ruthii), faces sericeous to glabrate||> 4|
|2||Leaves and peduncles (and stems) not densely stipitate-glandular; phyllaries eglandular (except in var. graminifolia)||Pityopsis graminifolia|
|2||Peduncles and phyllaries moderately to densely stipitate-glandular; distal leaves sometimes stipitate-glandular, especially along margins||> 3|
|3||Cauline leaves 2–6; heads 1–5(–10), involucres 9–11 mm||Pityopsis oligantha|
|3||Cauline leaves more than 15; heads (4–)10–70, involucres 4.5–8 mm||Pityopsis aspera|
|4||Peduncles and phyllaries moderately to densely stipitate-glandular; leaf faces silvery-sericeous||Pityopsis ruthii|
|4||Peduncles and phyllaries not or sparsely, minutely stipitate-glandular; leaf faces sericeous to glabrate||> 5|
|5||Stems flexuous; involucres (7–)8–11 mm, equaling pappi||Pityopsis flexuosa|
|5||Stems not flexuous; involucres 5–8 mm, usually shorter than pappi||> 6|
|6||Stems glabrous or sparsely piloso-sericeous; cauline leaves linear-filiform||Pityopsis pinifolia|
|6||Stems sparsely to densely sericeous; cauline leaves broadly to narrowly oblanceolate or linear||> 7|
|7||Cauline leaves linear, usually falcate; sandy coastal areas, New Jersey to Cape Cod||Pityopsis falcata|
|7||Cauline leaves lanceolate to ovate, not falcate||Pityopsis graminifolia|
|Author||John C. Semple +|
|Common name||Grass-leaved goldenasters +|
|Etymology||Greek pitys, pine, and opsis, appearance or likeness, alluding to pine-needlelike leaves of P. pinifolia +|
|Illustrator||Marjorie C. Leggitt +|
|Reference||semple1980d +, semple1985a +, semple1987b + and shinners1951b +|
|Synonym||Chrysopsis Pityopsis + and Heterotheca Pityopsis +|
|Taxon name||Pityopsis +|
|Taxon parent||Asteraceae tribe Astereae +|
|Taxon rank||genus +|
|Volume||Volume 20 +|