JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. ABSTRACTPlatanthera stricta Lindley is entomophilous and can produce seed via facultative self-pollination and intraracemic and interracemic pollination. Capsule production is pollinator-limited and seed set may be pollen-limited. In experimental plants capsules produced via self-and intraracemic pollination contained fewer seeds with normally developed embryos than did capsules produced via interracemic pollination. The inflorescence of Platanthera stricta is fragrant and is attractive to a wide array of anthophilous insects. It is pollinated by a diverse assemblage of short-tongued insects. The primary pollinators are Eustroma fasciata B. and McD. (Lepidoptera: Geometridae), Bombus flavifrons Cresson and B. melanopygus Nylander (Hymenoptera: Apidae), an undescribed species of Greya (Lepidoptera: Prodixidae), and several species of Empis, Rhamphomyia, and Anthepiscopus longipalpis Melander (Diptera: Empididae). Small amounts of glucose are present on the raceme. The extrafloral glucose may retain small pollinators on the inflorescence until they locate the floral spur aperture. THE BOG ORCHIDS, Platanthera L. C. Richard, are found in moist habitats in temperate and subtropical regions. About 30 species of Platanthera are found in North America; five species occur in northwestern North America, forming a morphologically diverse species complex (Luer, 1975). Very little is known about the reproductive biology of the northwestern Platanthera species. The purpose of this study was to determine the pollination biology of Platanthera stricta Lindley (syn. Habenaria saccata (Green) Hulten), a readilyidentifiable and abundant member of the northwestern North American Platanthera species complex.Platanthera stricta is typically a slender glabrous plant that may grow to be one meter tall. The green to yellow-green flowers are borne on an elongated raceme that is variable in length and number of flowers (Fig.l). The floral spur 1
Platanthera striata Lindley is entomophilous and can produce seed via facultative self‐pollination and intraracemic and interracemic pollination. Capsule production is pollinator‐limited and seed set may be pollen‐limited. In experimental plants capsules produced via self‐ and intraracemic pollination contained fewer seeds with normally developed embryos than did capsules produced via interracemic pollination. The inflorescence of Platanthera stricta is fragrant and is attractive to a wide array of anthophilous insects. It is pollinated by a diverse assemblage of short‐tongued insects. The primary pollinators are Eustroma fasciata B. and McD. (Lepidoptera: Geometridae), Bombus flavifrons Cresson and B. melanopygus Nylander (Hymenoptera: Apidae), an undescribed species of Greya (Lepidoptera: Prodixidae), and several species of Empis, Rhamphomyia, and Anthepiscopus longipalpis Melander (Diptera: Empididae). Small amounts of glucose are present on the raceme. The extrafloral glucose may retain small pollinators on the inflorescence until they locate the floral spur aperture.
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