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A SYSTEMATIC REVIEW OF THE SUBTRIBE LAGASCEINAE (COMPOSITAE, HELIANTHEAE)
Author(s) -
Stuessy Tod F.
Publication year - 1976
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1976.tb13213.x
Subject(s) - heliantheae , biology , tribe , senecioneae , botany , zoology , asteraceae , sociology , anthropology
The subtribe Lagasceinae of the tribe Heliantheae is recognized traditionally to consist of two genera: Lagascea and Coulterella. Although both taxa possess uni‐flowered heads aggregated into synflorescences, they are very different in most other morphological and anatomical respects. The six species of Lagascea that were investigated cytologically are n = 17, whereas the monotypic Coulterella is n = 18 with chromosomes one‐half the size of those of Lagascea. The dissimilarities suggest that the two genera should not be retained in the same subtribe, and that the subtribe Lagasceinae should be abandoned. Lagascea seems to be related most closely to genera of the subtribe Helianthinae, such as Alvordia. Coulterella , on the other hand, seems closest to Flaveria of the tribe Helenieae or Senecioneae.