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Populus alexanderi
Populus alexanderi Dorf Publ. Carnegie Inst. Washington, 412: 75. Oct 1930
- Name
- Populus alexanderi
- Rank
- Species
- Generic Name
- [Genus] Populus
- Authors (Pub.)
- Dorf E.
- Publication
- Pliocene floras of California [1930/10]
- Journal
- Publications of the Carnegie Institution of Washington
- Volume
- 412
- Page number
- 75
- Year
- 1930
- Fossil Status
- leaves
- Stratigraphy
- Pliocene
- Location
- Sonoma tuffs exposed in the walls of Matanzas Creek, three miles southeast of Santa Rosa and 0.375 of a mile northeast of the Santa Rosa School, near the head of Bennett Valley [LECTOTYPUS] and Garberville, California, USA
- Paleoregion
- America (North)
Data for Syntypus
- Repository
- Museum of Paleontology, University of California, Berkeley, USA
- Repository Number
- 324-327
- Diagnosis
- Leaves sub-coriaceous to thin; 5.5 to about 10 cm. long; 4 to 9 cm. broad at the middle; oval to lanceolate-ovate, truncate to slightly cordate at the base, contracted above to an obtusely, or in some cases acutely, acuminate apex; margin evenly' crenate-serrate above a more or less entire base, the teeth unsymmetrical, acute and pointing upward; petiole rarely preserved, stout and up to 2.5 cm. in length; midrib straight, strong; 5 to 7 pairs of strong secondaries, opposite at the base to alter:.. nate toward the apex, in a few cases opposite again near the tip; secondaries diverging from the midrib at rather inconstant angles varying from 30° to 90°, the basal pair fairly straight in some cases, but usually curving upward toward the margin, becoming finer and either forking with terminations in the. marginal teeth, or indistinctly joining the ones next above; basal secondaries usually giving off 3 to 6 tertiary branches from their abaxial sides at approximately 40° angles, the basal branches given off at or very near the intersection of the lowermost secondaries and the midrib; these basal tertiaries sub-parallel to each other, curving slightly upward and forking or joining the ones next above similarly to the larger secondaries; other tertiary veins very irregularly percurrent.
