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Obconic

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Inverted cone shape in botany

In botany, an obconic is an inverted cone shape. The term is most frequently applied to certain fruit or hypanthium structures with the apical end attached to the stem; however, less frequently the usage may apply to the pistil structure. In the case of fungi the designation is often made to the ascospore. The use of obconic in botany dates to at least as early as the nineteenth century; however, some modern usage applies to an entire plant form, such as the shape of a whole shrub. More broadly, in geometry or design, the term can be assigned in an abstract manner to shapes in the natural or man-made world which show an inverted cone design.

Botanical examples

The carnivorous plant Nepenthes deaniana has pitcher elements that are obconic in shape to capture insects. The hypanthium of the western USA plant Heuchera rubescens has one subspecies with an obconic structure, while several other subspecies have alternative hypantium geometries, so that the obconic characteristic is a subspecies determinant and diagnostic. The hypanthium of the Toyon shrub is also generally obconic in shape. The Asian tree Eriobotrya latifolia and several other species within the genus Eriobotrya have an obconic calyx, although some individuals manifest clavate calices. The basal portion of the pistil of Pachypodium baronii exhibits the obconic structural design.

As a fungal example the species Pocillum cesatii is noted to have an obconic ascospore.

Etymology and historical usage

The derivation of the word obconic is based upon the Greek with the common prefix ob, meaning inverted, and the Greek word for angle gon or gonia, followed by the generic suffix ic. Historically botanists have used the designation obconic to describe elements of a plant such as the fruit, hypanthium, calyx or pistil base since at least as early as the nineteenth century, and in modern times the term has been generalized to also refer to an entire plant architectural shape.

See also

References

  1. Annette J.G. Wilson, Alexander S. George, Anthony E. Orchard (2001) Flora of Australia, Published by ABRS/CSIRO ISBN 0-643-06720-5
  2. M.R. Cheek and M.H.P. Jebb (1999) Nepenthes (Nepenthaceae) in Palawan, Philippines. Kew Bulletin 54(4): 887–895. doi:10.2307/4111166
  3. Willis Linn Jepson and James C. Hickman (1993) The Jepson Manual: Higher Plants of California, Published by University of California Press, 1400 pages ISBN 0-520-08255-9
  4. C. Michael Hogan (2008) Toyon (Heteromeles arbutifolia), GlobalTwitcher, ed. Nicklas Stromberg "Toyon (Heteromeles arbutifolia ) - - GlobalTwitcher.com". Archived from the original on July 19, 2009. Retrieved August 19, 2009.
  5. Joseph Dalton Hooker (1879) The Flora of British India, Great Britain India Office, Published by L. Reeve
  6. George Massee (1895) British Fungus-flora: A Classified Text-book of Mycology
  7. Laurence Urdang, Alexander Humez and Howard G. Zettler (1982) Suffixes and Other Word-final Elements of English, Contributor Laurence Urdang, Published by Gale Research Co.


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