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Pentagramma triangularis subsp. triangularis  
Family: Pteridaceae
[Ceropteris triangularis (Kaulf.) Underw., moreGymnogramma triangularis Kaulf., Gymnopteris triangularis Underw., Hemionitis triangularis (Kaulf.) Christenh., Neurogramma triangularis (Kaulf.) Diels, Pityrogramma triangularis (Kaulf.) Maxon, Pityrogramma triangularis var. triangularis]
Pentagramma triangularis subsp. triangularis image
Patrick Alexander
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George Yatskievych
Michael D. Windham in Flora of North America (vol. 2)
Petiole glabrous, not viscid-glandular. Blade thin and herbaceous to somewhat thick and leathery, not viscid-glandular, abaxially densely pale to bright yellow, adaxially glabrous. Distal pinnae mostly regularly lobed. Proximal basiscopic lobes of basal pinnae pinnatifid, often deeply so. 2 n = 60, ca. 90, 120. Chaparral, pine and oak woodlands; 50--1800 m; B.C.; Calif., Idaho, Oreg., Wash.; Mexico in Baja California. We here restrict Pentagramma triangularis subsp. triangularis to plants with yellow farina and glabrous adaxial leaf surfaces occurring throughout a large region in westernmost North America. This subspecies comprises a complex of morphological, cytological, and phytochemical variants, at least some of which may deserve formal taxonomic recognition, following more detailed studies. Plants with yellow farina reported from Arizona, Nevada, and Utah may represent tetraploid hybrids between P . triangularis subsp. triangularis and P . triangularis subsp. maxonii and are not mapped herein.

Pentagramma triangularis subsp. triangularis
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Pentagramma triangularis subsp. triangularis image
Patrick Alexander
Pentagramma triangularis subsp. triangularis image
Patrick Alexander
Pentagramma triangularis subsp. triangularis image
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Linnea Johnson
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Pentagramma triangularis subsp. triangularis image
Linnea Johnson
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Pentagramma triangularis subsp. triangularis image
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.