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Pentagramma triangularis  
Family: Pteridaceae
Pentagramma triangularis image
Patrick Alexander
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George Yatskievych
Michael D. Windham in Flora of North America (vol. 2)
Petiole chestnut brown to dark brown, somewhat shiny, glabrous or sometimes viscid-glandular or rarely somewhat white-farinose proximally. Blade thin and herbaceous to thick and leathery, abaxially densely farinose, farina white or yellow, adaxially bright green to yellowish green when fresh, glabrous to glandular or viscid. Pentagramma triangularis occurs in rock crevices and at the base of overhanging boulders in drainages and on slopes and roadbanks. Occasional plants in which the farina is nearly absent may be encountered. These have been described as Pityrogramma triangularis var. viridis Hoover, a name of uncertain application that appears to refer to misshapen-spored hybrids of various parentage within the Pentagramma triangularis complex.

Pentagramma triangularis
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Pentagramma triangularis image
Patrick Alexander
Pentagramma triangularis image
Patrick Alexander
Pentagramma triangularis image
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Linnea Johnson
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.