Abstract
Some recent systematic investigations have placed great reliance on micromorphological floral features in generic delimitation in the Senecioneae. In order to test the taxonomic value of those features, 31 species of New World “Cacalioid” and “Senecionoid” Senecioneae were examined for five micromorphological characters: 1) configuration and distribution of the stigmatic area on the style branches, 2) stylopodial structure, 3) cellular structure of the carpopodium, 4) configuration of the anther collar, and 5) form of the endothecial cells in the anther. LM or SEM photographs were made for each character for each species. Variation was found to exist with age and geographical range for each of these characters and sometimes between florets on one capitulum. Differences in these five microcharacters were found between the “Cacalioid” and “Senecionoid” genera, but they were no more consistent than the differences in traditional characters employed in generic delimitation.
Literature Cited
Barkley, T. M. & A. Cronquist. 1974.Cacalia rugelia: new combination for a North American Senecionoid. Rhodora 76: 48–50.
Bentham, G. 1873a. Notes on the classification, history, and geographical distribution of Compositae. J. Linn. Soc. Bot. 13: 335–582.
Bentham, G. 1873b. Compositae. Pages 163–533.In: G. Bentham & J. D. Hooker. Genera Plantanum. Vol. 2. London.
Blake, S. F. 1926.In: P. C. Standley. Trees and shrubs of Mexico, Part 5, (Bignoniaceae—Asteraceae). Contr. U.S. Natl. Herb. 23: 1312–1721.
Cabrera, A. L. 1950. Notes on the Brazilian Senecioneae. Brittonia 7: 53–74.
Cuatrecasas, J. 1955. A new genus and other novelties in Compositae. Brittonia 8: 151–163.
— 1960. Studies on Andean Compositae. IV. Brittonia 12: 182–195.
De Candolle, A. P. 1838. Prodromus. Vol. 6. Paris.
Dormer, K. J. 1962. The fibrous layer in the anthers of Compositae. New Phytol. 61: 150–153.
Drury, D. G. 1973. Annotated key to the New Zealand shrubby Senecioneae—Compositae and their wild garden hybrids. New Zealand J. Bot. 11: 731–784.
— 1975. A comparison ofSenecio kirkii (New Zealand) andSenecio insularis (Lord Howe Island) with Senecios endemic to the island of St. Helena. New Zealand J. Bot. 13: 769–780.
Elliott, S. 1823. A sketch of the botany of South-Carolina and Georgia. Vol. 2. Charleston.
Gibson, E. S. 1969. A revision of the sectionPalmatinervii of the genusSenecio and its allies. Doctoral dissertation, Library, Kansas State University.
Greenman, J. M. 1901. Monographie der nord- und centralamerikanischen Arten der GattungSenecio—I Teil. Leipzig. (Reprinted in Bot. Jahrb. Syst. 32: 1–33. 1903.)
Hoffman, O. 1890. Compositae. Pages 87–387.In A. Engler & K. Prantl. Die natürlichen Pflanzenfamilien. Teil 4(5). Leipzig.
Jeffrey, C. 1979. Note on the lectotypification of the namesCacalia L.,Matricaria L. andGnaphalium L. Taxon 28: 349–351.
— 1980. Generic and sectional limits inSenecio (Compositae): II. Evaluation of some recent studies. Kew Bull. 34: 49–58.
—, P. Halliday, M. Wilmot-Dear & S. W. Jones. 1978. Generic and sectional limits inSenecio (Compositae): I. Progress report. Kew Bull. 32: 47–67.
Keil, D. J. & T. F. Stuessy. 1981. Systematics ofIsocarpha (Compositae: Eupatorieae). Syst. Bot. 6: 258–287.
King, R. M. & H. Robinson. 1970. The new synantherology. Taxon 19: 6–11.
Kitamura, S. 1942. Compositae Japonicae. Pars tertia. Mem. Coll. Sci. Kyoto Imp. Univ., Ser. B, Biol. 16: 155–292.
Koyama, H. 1967. Taxonomic studies on the tribe Senecioneae of Eastern Asia. I. General part. Mem. Coll. Sci. Kyoto Imp. Univ., Ser. B., Biol. 33: 181–209.
Löve, A. & D. Löve. 1975. Nomenclatural notes on Arctic plants. Bot. Not. 128: 497–523.
Nordenstam, B. 1976. Re-classification ofChrysanthemum L. in South Africa. Bot. Not. 129: 137–165.
— 1977. Senecioneae and Liabeae—systematic review. Pages 799–830.In: V. H. Heywood, J. B. Harborne & B. L. Turner, editors. The biology and chemistry of the Compositae. Vol. II. Academic Press, New York.
— 1978. Taxonomic studies in the tribe Senecioneae (Compositae). Opera Bot. 44: 3–83.
Pippen, R. W. 1968. Mexican “Cacalioid” genera allied toSenecio (Compositae). Contr. U.S. Natl. Herb. 34: 365–447.
Pojarkova, A. 1961.Cacalia. Pages 683–697.In: B. K. Schischkin & E. G. Bobrov, editors. Flora URSS. Vol. 26.
Robinson, H. 1974. Studies in the Senecioneae (Asteraceae). VI. The genusArnoglossum. Phytologia 28: 294–295.
— 1975. Studies in the Senecioneae (Asteraceae). VII. Additions to the genusRoldana. Phytologia 32: 331–332.
— 1978. Studies in the Senecioneae (Asteraceae). VIII. A new species ofPsacalium from Mexico. Phytologia 38: 356–358.
— & R. D. Brettell. 1973a. Studies in the Senecioneae (Asteraceae). I. A new genus,Pittocaulon Phytologia 26: 451–453.
— &-—. 1973b. Studies in the Senecioneae (Asteraceae). II. A new genus,Nelsonianthus. Phytologia 27: 53–54.
— &-—. 1973c Studies in the Senecioneae (Asteraceae). III. The genusPsacalium. Phytologia 27: 254–264.
— &-—. 1973d. Studies in the Senecioneae (Asteraceae). IV. The generaMesadenia, Syneilesis, Miracacalia, Koyamacalia, andSinacalia. Phytologia 27: 265–276.
— &-—. 1974. Studies in the Senecioneae (Asteraceae). V. The generaPsacaliopsis, Barkleyanthus, Telanthophora andRoldana. Phytologia 27: 402–439.
— & J. Cuatrecasas. 1977. Notes on the genus and species limits ofPseudogynoxys (Greenm.) Cabrera (Senecioneae, Asteraceae). Phytologia 36: 177–192.
— &-—. 1978. A review of the Central American species ofPentacalia (Asteraceae: Senecioneae). Phytologia 40: 37–50.
— & R. M. King. 1977. Eupatorieae—systematic review. Pages 437–485.In: V. H. Heywood, J. B. Harborne & B. L. Turner, editors. The biology and chemistry of the Compositae. Vol. I. Academic Press, New York.
Rydberg, P. A., 1924a. Some senecioid genera I. Bull. Torrey Bot. Club 51: 369–378.
— 1924b. Some senecioid genera II. Bull. Torrey Bot. Club 51: 409–420.
Vuilleumier, B. S. 1969. The genera of Senecioneae in the southeastern U. S. J. Arnold Arbor. 50: 104–123.
— & C. E. Wood. 1969. Lectotypification ofCacalia L. (Compositae—Senecioneae). J. Arnold Arbor. 50: 268–273.
Weber, W. A. 1973. Additions to the Colorado flora, V, with nomenclature revisions. Southw. Naturalist 18: 317–329.
Williams, L. O., 1975. Tropical American plants. XVIII. Phytologia 31: 435–447.
Author information
Authors and Affiliations
Additional information
Submitted as partial requirement for a Master’s of Science, Kansas State University. This work was partially supported by the Kansas Agricultural Experiment Station.
Rights and permissions
About this article
Cite this article
Wetter, M.A. Micromorphological characters and generic delimitation of some New World Senecioneae (Asteraceae). Brittonia 35, 1–22 (1983). https://doi.org/10.2307/2806039
Issue Date:
DOI: https://doi.org/10.2307/2806039