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HYBRIDIZATION BETWEEN ANNUAL SPECIES OF PHLOX: POPULATION STRUCTURE
Author(s) -
Levin Donald A.
Publication year - 1967
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.1537-2197.1967.tb10742.x
Subject(s) - biology , reproductive isolation , botany , population , ecological niche , habitat , ecology , demography , sociology
Phlox cuspidata ( n = 7) and P. drummondii subsp. drummondii ( n = 7) are closely related annuals which are indigenous to eastern and central Texas. The species typically occupy different ecological niches but may form contiguous or confluent populations in disturbed habitats and hybridize therein. On the basis of correlative interpretations of exomorphic, chromatographic and fertility information, hybridizing populations can be segregated into three distinct classes: (1) highly fertile plants with the morphological and phenolic attributes of P. drummondii ; (2) highly fertile plants with the morphological and chemical attributes of P. cuspidata ; (3) sterile plants with manifestly intermediate morphology and complementary chromatographic patterns. These data strongly suggest that hybridizing populations of P. drummondii and P. cuspidata are tritypic, being composed of “pure” or essentially “pure” parental species and a group of plants which has all of the attributes characteristic of an F 1 hybrid.