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Platanthera dilatata var. leucostachys

Higher Taxonomy
Family: OrchidaceaeView DescriptionDichotomous Key

Habit: Perennial herb, terrestrial [growing on other pls], non-green (nutrition from association of roots with fungi) or green, generally from rhizomes or tubers with few to many fleshy to slender roots; cauline leaves +- reduced to sheathing stem bracts or not. Leaf: 1--many, basal to cauline, linear to +- round, alternate to opposite (if only 1 pair), generally sessile. Inflorescence: flowers 1--many, spike or raceme, bracted. Flower: bisexual, bilateral, in bud generally rotating 180° by twisting ovary (position of parts indicated after twisting); sepals generally 3, generally free, generally petal-like, uppermost generally erect, lateral with chin- or spur-like projection (mentum) or not; petals 3, 1 (lip) different, spurred or not; stamens generally 1 (3 in Cypripedium, 2 functional, 1 a staminode), fused with style, stigma into column, pollen generally lumped, generally removed as unit by insect; ovary inferior, 1-chambered, placentas 3, parietal, stigma 3 lobed, generally under column tip. Fruit: capsule. Seed: many, minute.
Genera In Family: +- 800 genera, +- 25000 species: especially tropics (worldwide except Antarctica). Many cultivated for ornamental, especially Cattleya, Cymbidium, Epidendrum, Oncidium, Paphiopedilum; Vanilla planifolia Andrews fruits used to flavor food. Note: Platanthera may be paraphyletic without inclusion of Piperia (Bateman et al. 2009 Ann Bot 104:431--445); study needed.
eFlora Treatment Author: Ronald A. Coleman, Dieter H. Wilken & William F. Jennings, except as noted
Scientific Editor: Ronald A. Coleman, Thomas J. Rosatti.
Genus: PlatantheraView DescriptionDichotomous Key

Common Name: BOG-ORCHID
Habit: 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.
Species In Genus: +- 85 species: temperate North America, Eurasia. Etymology: (Greek: wide anther) Note: Identification often difficult due to intermediates, hybrids; additional species expected in California. Platanthera hyperborea (L.) Lindl. not in California.
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.
eFlora Treatment Author: Ronald A. Coleman

Platanthera dilatata (Pursh) Lindl. ex L.C. Beck var. leucostachys (Lindl.) Luer
Habit: Plant 15--150 cm. Leaf: 5--35 cm, 9--30 mm wide. Inflorescence: 5--35 cm, generally dense; lower bracts 9--25 mm. Flower: perianth white to cream; sepals 4--8 mm; lip 5--10 mm, +- lanceolate, spur 5--15 mm, generally >= 1.5 × lip, generally cylindric, +- curved; column generally < 1/2 hood formed by upper sepal, petals. Chromosomes: 2n=42.
Ecology: Wet, generally open places, meadows, seeps, streambanks; Elevation: < 3400 m. Bioregional Distribution: CA-FP (exc GV), GB, n DMtns (Panamint Range); Distribution Outside California: to Alaska, Montana, Utah, Nevada. Flowering Time: May--Sep Note: Hybridizes with Platanthera sparsiflora (Platanthera ×lassenii W.J. Schrenk), Platanthera stricta (Platanthera ×estesii W.J. Schrenk), Platanthera tescamnis (unnamed).
Synonyms: Platanthera leucostachys Lindl.; Habenaria dilatata (Pursh) Hook. var. leucostachys (Lindl.) Ames
eFlora Treatment Author: Ronald A. Coleman
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Citation for this treatment: Ronald A. Coleman 2016. Platanthera dilatata var. leucostachys, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 01, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 01, 2016.

Platanthera dilatata var. leucostachys
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© 2009 Barry Rice
Platanthera dilatata var. leucostachys
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© 2009 Neal Kramer
Platanthera dilatata var. leucostachys
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© 2002 George W. Hartwell
Platanthera dilatata var. leucostachys
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© 2009 Thomas Stoughton
Platanthera dilatata var. leucostachys
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© 2006 George W. Hartwell
Platanthera dilatata var. leucostachys
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© 2010 Julie Kierstead Nelson

More photos of Platanthera dilatata var. leucostachys in CalPhotos

Geographic subdivisions for Platanthera dilatata var. leucostachys:
CA-FP (exc GV), GB, n DMtns (Panamint Range);
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.