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Acer washingtonense
Taxonomy
Acer washingtonense was named by Wolfe and Tanai (1987) [Species encompasses both leaves and fruits ]. Its type specimen is UWBM 56253A, B., a leaf, and it is a compression fossil. Its type locality is Republic, UWBM locality A0307, which is in a Ypresian lacustrine - large mudstone in the Klondike Mountain Formation of Washington.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Acer washingtonense Wolfe and Tanai |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Acer washingtonense Wolfe and Tanai 1987
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. A. Wolfe and T. Tanai 1987 | Leaf simple, perfectly actinodromous; shallowly 3-lobed, with 5 primary veins; lateral lobes 213 as long as medial lobe, lobes triangular; shape wide-elliptic, 7.5 cm long, (estimated) 5.0 cm wide; base shallowly cordate, apex acuminate; most apical lateral primary veins parallel to medial secondary veins and markedly convex; 5 secondary veins originating at angles of 40° to 50° from basal side of lateral primary
veins, markedly convex, craspedodromous; 7 pairs of medial secondary veins originating at angles of 40° to 70°, markedly convex, craspedodromous; lobal sinal bracing formed by acutely originating medial external secondary vein; tertiary veins A-R, compound, spaced 0.2 to 0.4 cm; fourth order venation irregularly polygonal; fifth order veins forming polygons 0.7 to 1.5 mm in diameter, veinlets twice-branching; teeth large, 0-1 or 0-3, simple. Fruit samaroid, nutlet at basal end; nutlet 0.6 cm long, 0.5 cm wide; outline suborbiculate; nutlet moderately and asymmetrically inflated; a pair of indistinct medial flanges attachment scar 0.4 cm long, with proximal keel; nutlet venation indistinct, but several veins pass onto wing; attachment angle 45°, nutlet angle 20°; proximal margin slightly expanded beyond proximal margin of wing. Wing 2.0 cm long, 0.7 cm wide, extending along distal margin of nutlet; proximal margin straight distal margin broadly convex, forming a broadly U-shaped sulcus with nutlet; proximal margin with 6 prominent veins that extend from apical margin of nutlet; wing veins diverging from proximal margin at angles of 10° to 20°, curving markedly convexly, dichotomizing 5 or 6 times, few anastomoses. |