Three new taxa of Collinsia (Plantaginaceae) provide additional evidence for neoendemism in the upper Merced River watershed of the central Sierra Nevada, California
Data files
Oct 01, 2025 version files 17.49 KB
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Fig_1_sequence_matrix.txt
16.23 KB
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Fig_1_treefile
316 B
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README.md
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Abstract
Field and phylogenetic studies of Collinsia previously resulted in discovery of the distinctive “metamorphica” clade from metamorphic scree of the upper Merced River drainage on the western slope of the central Sierra Nevada, California. The three component lineages within this clade are described here as new taxa: C. metamorphica from the South Fork Merced River watershed, C. parkii from Trumbull Peak, and C. wakahlmae from the Merced River canyon in the vicinity of El Portal. These new taxa, first collected in the 1980s, have been confused with C. childii, C. linearis, and C. rattanii. Collectively, the three new taxa can be distinguished from C. childii by their narrower mid- to distal-stem leaves, and, in fruit, their much less recurved to erect calyx lobes that are not longer than the capsule, or not conspicuously so. They are distinguishable from C. linearis and C. rattanii by their non-revolute leaf margins and capsules with only two seeds. The three new taxa differ in part from one another by a combination of corolla color, size, and shape, calyx length, and leaf blade shape. These morphologically and geographically distinctive taxa provide additional evidence for angiosperm diversification within the upper Merced River watershed and collectively have distributions similar to those of some other endemics of the area that co-occur on metamorphic scree exposures. Further exploration of these habitats for undescribed plant diversity and any undiscovered populations of these rare new taxa is warranted.
https://doi.org/10.5061/dryad.9zw3r22nw
The dataset represents the DNA sequence data matrix and maximum likelihood tree file supporting Fig. 1 in the Systematic Botany article by Baldwin, B. G., S. Fawcett, and W. S. Armbruster.
Fig_1_sequence_matrix = Combined nuclear ribosomal DNA internal transcribed spacer (ITS) and external transcribed spacer (ETS) sequences and chloroplast DNA (cpDNA) sequences of members of the Collinsia "metamorphica" clade (ingroup), plus two outgroup sequences, from C. bartsiifolia and C. greenei. Matrix is in NEXUS format.
Fig_1_treefile = Maximum likelihood tree based on Fig_1_sequence_matrix, in newick format. Analyses were conducted using IQ-TREE (Trifinopoulos et al. 2016), with TIM3e substitution model chosen by ModelFinder (Kalyaanamoorthy et al. 2017).
The dataset was based on nrDNA and cpDNA sequences analyzed by Baldwin et al. (2011 American Journal of Botany 98: 731–753). Outgroup = Collinsia bartsiifolia Benth. var. bartsiifolia (BGB & WSA 858) and C. greenei A.Gray (BGB 952) — both at JEPS (first two taxa in sequence matrix). Tip names for ingroup correspond to sample locality; numbers correspond to sample designations for the “metamorphica” clade in Baldwin et al. (2011), as follows (BGB = Bruce G. Baldwin; MSP = Michael S. Park; WSA = W. Scott Armbruster): (1) MSP 1614; (2) MSP 1897; (3) BGB & WSA 1483; (4) MSP 1899; (5) MSP 2147; (6) MSP 1905; (7) BGB & WSA 1484; and (8) MSP 1871 — all at JEPS. The treefile represents a maximum likelihood phylogram; analyses were conducted using IQ-TREE (Trifinopoulos et al. 2016 Nucleic Acids Research 44: W232–W235), with TIM3e substitution model chosen by ModelFinder (Kalyaanamoorthy et al. 2017 Nature Methods 14: 587–589).