Florissantia ashwillii

Name

Florissantia ashwillii

Rank

Species

Generic Name

[Genus] Florissantia

Authors (Pub.)

Manchester S. R.  

Publication

Flowers, fruits and pollen of Florissantia, an extinct malvalean genus from the Eocene and Oligocene of western North America [1992/9]

Journal

American Journal of Botany

Volume

79

Issue

9

Page number

1005

Year

1992

Fossil Status

flowers (with fruits)

Stratigraphy

Eocene

Strat. comment

Clarno Formation

Location

Sheep Rock Creek, Oregon, USA

Paleoregion

America (North)

Data for Holotypus

Repository

Florida Museum of Natural History, Gainesville, USA

Repository Number

UF 11740

Num

fig. 35

Pub.

Flowers, fruits and pollen of Florissantia, an extinct malvalean genus from the Eocene and Oligocene of western North America [1992/9]

Diagnosis

Pedicel 0.6 mm thick, at least 13 mm long. Calyx 21-31 mm diam, gamosepalous, shallowly campanulate, membranaceous, five-parted; calyx incision 40%-60% with lobes well developed, persistent in fruit, with prominent radiating reticulate venation; narrowed and conforming to outline of androgynophore at base. Petals absent. Androgynophore up to 1.5 mm long, thick-. ened into a disk 1. 5-1.7 mm diam at the base of the ovary. Ovary superior, obovate, rounded to five-angled in transverse view, with a single style. Androecium consisting of five stamens with filaments fused by their bases into a narrow circular sleeve around the base of the ovary. Filaments 3.5-6.4 mm long. Anther 1.0 mm wide, 1.9 mm long, elongate, transversely septate. Pollen oblate, 20-22.5 ,urn (Canada balsam) or 25-27.5 ,urn (glycerine jelly) equatorial diam, isopolar, radially symmetrical, tricolporate, with short colpi. Amb circular to rounded-triangular. Each aperture situated midway between two adjacent angles in grains with rounded-angular amb. Ornamentation reticulate, with smooth muri and more or less angular lumina 0.4-1.0 ,urn. Fruit consisting of the enlarged ovary, the persistent calyx, and pedicel. Fruit body circular to pentagonal in transverse view 4.1-5.6 mm diam, elliptical in longitudinal view.