Three New Species of Collinsia (Plantaginaceae) Provide Additional Evidence for Neoendemism in the Upper Merced River Watershed of the Central Sierra Nevada, California

Author:

Baldwin Bruce G.1,Fawcett Susan2,Armbruster W. Scott3

Affiliation:

1. 1Jepson Herbarium and Department of Integrative Biology, 1001 Valley Life Sciences Building #2465, University of California, Berkeley, California 94720-2465, USA;, Email: bbaldwin@berkeley.edu

2. 2University and Jepson Herbaria, 1001 Valley Life Sciences Building #2465, University of California, Berkeley, California 94720-2465, USA;, Email: sfawcett@berkeley.edu

3. 3School of Biological Sciences, University of Portsmouth, Portsmouth PO1 2DY, UK

Abstract

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 species: 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, as is their immediate protection from potential threats.

Publisher

American Society of Plant Taxonomists

Reference29 articles.

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3. Fine-scale to flora-wide phylogenetic perspectives on Californian plant diversity, endemism, and conservation;Baldwin;Annals of the Missouri Botanical Garden,2019

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