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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.



Ronald A. Coleman

Rhizome tuber-like, elongate. Leaf: cauline, alternate, linear to elliptic or lanceolate, gradually reduced upward, with 1 lengthwise fold. Inflorescence: generally spike; flower bracts leaf-like. Flower: perianth white to yellow-green or green; sepals ± equal, upper generally hood-like, lower free, generally spreading; lateral petals generally erect, lip spurred, pendent to upcurved; column ± erect. Fruit: ascending to erect.
± 85 species: temperate North America, Eurasia. (Greek: wide anther) [Sheviak & Jennings 2006 Rhodora 108:19–33] Identification often difficult due to intermediates, hybrids; additional species expected in California. Platanthera hyperborea (L.) Lindl. not in California.
Unabridged references: [Colwell et al. 2007 Madroño 54:86–93]
Unabridged note: In California, > 1 sp. often occurs in a given area and blooms at ± the same time, yielding many hybrids and hybrid swarms, including some that have not been named, e.g., Platanthera dilatata × Platanthera tescamnis, as well as others that have, e.g., Platanthera ×estesii W.J. Schrenk (Platanthera dilatata × Platanthera stricta) and Platanthera ×lassenii W.J. Schrenk (Platanthera dilatata × Platanthera sparsiflora). Some purported hybrids, e.g., Platanthera ×correllii W.J. Schrenk and Platanthera ×media (Rydb.) Luer, now treated as a synonym of Platanthera huronensis (Nutt.) Lindl., do not occur in California.

Key to Platanthera

1. Perianth white to cream; spur generally >= 1.5 × lip ..... P. dilatata var. leucostachys

1' Perianth green to yellow-green; spur << to ± > lip

2. Column generally 2.5–4 mm, ± 2/3 hood formed by upper sepal, lateral petals; lip linear to lance-linear ..... P. sparsiflora

2' Column generally 1.5–2 mm, <= ± 1/2 hood formed by upper sepal, lateral petals; lip wider than lance-linear

3. Spur generally cylindric, ± curved — lip lanceolate to oblong or linear-oblong, green-yellow to yellow; leaves clustered near base ..... P. tescamnis

3' Spur club- to sac-like

4. Lip linear to lanceolate, green, red-marked or not; leaves not clustered ..... P. stricta

4' Lip generally lance-rhombic, yellow, not red-marked; leaves clustered below ..... P. yosemitensis


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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