Mahonia lobodonta

Name

Mahonia lobodonta

Rank

Species

Generic Name

[Genus] Mahonia

Authors (Pub.)

Becker H. F.  

Publication

A new species of Mahonia from the Oligocene Ruby Flora of Southwestern Montana [1959/10]

Journal

Contributions from the Museum of Paleontology, University of Michigan

Volume

15

Issue

3

Page number

35

Year

1959

Fossil Status

leaves

Stratigraphy

Oligocene

Location

Ruby basin, Montana, USA

Paleoregion

America (North)

Data for Holotypus

Repository

Museum of Palaeontology, University of Michigan, Ann Arbor, USA

Repository Number

UMMP No. 39566

Num

1

Pub.

A new species of Mahonia from the Oligocene Ruby Flora of Southwestern Montana [1959/10]

Diagnosis

Leaf 3-pinnate, 4 cm, long, 8 cm. wide; petiole 1% cm long (incomplete), 1 mm. wide with 5 minute, longitudinal striations or grooves; leaflets elongate, inaequilateral, deeply dentate, 4 cm. in length, 29 cm. in total width, sessile, terminal to petiole; lobed teeth 5, prominent, 2 pairs of teeth opposite, central tooth apical; lobed teeth entire, 10 to 13 mm. long, 3 to 5 mm. wide at base, tapering sharply to an (presumably) acute or spinose tip; lamina 7 to 9 mm. wide above basal lobes, 4 to 5 mm. above second pair in the middle of the leaflet; sinuses slightly rounded to angular, mostly 80°, but ranging from 60' to 100'; base broadly cuneate in lateral leaflets which are perpendicular to petiole, narrowly cuneate in central leaflet; midrib strong, curved, flanked by prominent, upward-curving primaries from which abaxial secondaries enter the basal teeth; pair of strong secondaries arising in the middle of the blade at 40' to 50' angle, entering second pair of teeth; primaries and secondaries branching irregularly, forming a coarse, longitudinal mesh; tertiary venation obscure; structure curled; margin thickened; texture coriaceous.