Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Virginianthus calycanthoides gen. et sp. nov.-A Calycanthaceous Flower from the Potomac Group (Early Cretaceous) of Eastern North America

Else Marie Friis, Helena Eklund, Kaj Raunsgaard Pedersen and Peter R. Crane
International Journal of Plant Sciences
Vol. 155, No. 6 (Nov., 1994), pp. 772-785
Stable URL: http://www.jstor.org/stable/2475338
Page Count: 14
  • Read Online (Free)
  • Download ($19.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Virginianthus calycanthoides gen. et sp. nov.-A Calycanthaceous Flower from the Potomac Group (Early Cretaceous) of Eastern North America
Preview not available

Abstract

We describe a new well-preserved fossil flower, Virginianthus calycanthoides gen. et sp. nov., from the Early Cretaceous (Early or Middle Albian) of Virginia. The flower is multipartite and has a distinct, deep floral cup. The perianth and androecium are borne on the rim of the floral cup and arranged in several crowded series. Reconstruction of the flower indicates that the perianth is composed of about 12 closely spaced tepals with apically directed hairs on the abaxial surface. The androecium consists of approximately 30-40 closely spaced, sessile stamens. The anthers are dithecate and tetrasporangiate, with the pollen sacs borne toward the abaxial surface. Dehiscence is extrorse through laterally hinged valves. Pollen grains are monocolpate and reticulate and resemble the previously described pollen species Clavatipollenites minutus Brenner. Sterile structures in the transition zone between androecium and gynoecium are interpreted as inner staminodes. The gynoecium is composed of approximately 18-26 carpels borne in several series on the inner surface of the hypanthium. The flower is closely comparable to extant members of the family Calycanthaceae (including Idiospermum) and constitutes the earliest documentation of calycanthoid features in the fossil record. Differences from extant Calycanthaceae are mainly in details of the pollen sacs, anther dehiscence, and pollen morphology.

Page Thumbnails

  • Thumbnail: Page 
772
    772
  • Thumbnail: Page 
773
    773
  • Thumbnail: Page 
774
    774
  • Thumbnail: Page 
775
    775
  • Thumbnail: Page 
776
    776
  • Thumbnail: Page 
[777]
    [777]
  • Thumbnail: Page 
[778]
    [778]
  • Thumbnail: Page 
779
    779
  • Thumbnail: Page 
[780]
    [780]
  • Thumbnail: Page 
781
    781
  • Thumbnail: Page 
782
    782
  • Thumbnail: Page 
783
    783
  • Thumbnail: Page 
784
    784
  • Thumbnail: Page 
785
    785