Decrypting Cryptic Species: Morphological and Molecular Evidence for Recognizing Navarretia linearifolia as Distinct from N. sinistra (Polemoniaceae)
The unified species concept and a criterion of limited homogenizing gene flow as evidenced by genetic and morphological markers were applied to species delimitation within Navarretia sinistra. Concordant patterns of variation diagnose two morphologically cryptic species. As a
consequence, the basionym Gilia linearifolia is here lectotypified and re-established for this long neglected epithet.
Navarretia linearifolia
shows strong differentiation from N. sinistra in allozyme data and DNA sequences from chloroplast regions, nrDNA, and introns
of the low copy nuclear genes idhA, idhB, and g3pdh. In macroscopic features, N. linearifolia differs from N. sinistra primarily in tendencies, rather than absolute differences. Two finer-scale features are diagnostic: pollen sexine sculpturing and mature
seed color. The combination
Navarretia linearifolia
subsp.
pinnatisecta
is made for the large flowered populations of this species geographically restricted to the NW region of the California floristic province. The smaller flowered
N. linearifolia
subsp.
linearifolia
extends from California to Washington, with a more westwardly distribution compared to N. sinistra, which ranges east into Idaho, Utah, and Colorado.
Keywords: CRYPTIC SPECIES; GILIA; LECTOTYPE; SPECIES CRITERIA; SPECIES DELIMITATION; UNIFIED SPECIES CONCEPT
Document Type: Regular Paper
Publication date: 01 July 2010
- Systematic Botany is the scientific journal of the American Society of Plant Taxonomists and publishes four issues per year.
2011 Impact Factor: 1.517
2011 ISI Journal Citation Reports® Rankings: 87/190 - Plant Sciences
34/45 - Evolutionary Biology - Editorial Board
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