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Platanthera dilatata var. leucostachys
WHITE-FLOWERED BOG-ORCHID

Higher Taxonomy
Family: OrchidaceaeView DescriptionDichotomous Key

Common Name: ORCHID FAMILY
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
NATIVE
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, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=63974, accessed on May 25, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 25, 2016.


Platanthera dilatata var. leucostachys
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© 2013 Barry Rice
Platanthera dilatata var. leucostachys
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© 1982 Gary A. Monroe
Platanthera dilatata var. leucostachys
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© 2009 Julie Kierstead Nelson
Platanthera dilatata var. leucostachys
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© 2002 California Academy of Sciences
Platanthera dilatata var. leucostachys
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© 2009 Keir Morse
Platanthera dilatata var. leucostachys
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© 2006 Neal Kramer

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. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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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.