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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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Perennial herb, terrestrial [growing on other plants], 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.
± 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. [Romero-Gonzalez et al. 2002 FNANM 26:490–651] —Scientific Editors: Ronald A. Coleman, Thomas J. Rosatti.
Unabridged references: [Luer 1975 Orchids US and Can, NY Bot Garden; Coleman 1995 Wild Orchids of California. Cornell Univ.]
Key to Orchidaceae
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.Key to Platanthera
± 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.
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.
2n=42. Wet, generally open places, meadows, seeps, streambanks; < 3400 m. California Floristic Province (except Great Central Valley), Great Basin Floristic Province, n Desert Mountains (Panamint Range); to Alaska, Montana, Utah, Nevada. [Platanthera leucostachys Lindl.] Hybridizes with Platanthera sparsiflora (Platanthera ×lassenii W.J. Schrenk), Platanthera stricta (Platanthera ×estesii W.J. Schrenk), Platanthera tescamnis (unnamed). May–Sep [Online Interchange]
Unabridged note: Expanded author citation: Platanthera dilatata (Pursh) Lindl. ex L.C. Beck var. leucostachys (Lindl.) Luer.
Previous taxon: Platanthera
Next taxon: Platanthera sparsiflora
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 19 2014
Citation for this treatment: [Author of taxon treatment] 2012. Platanthera, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=63974, accessed on Apr 19 2014
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|Platanthera dilatata var. leucostachys|
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© 2009 Thomas Stoughton
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