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. 2011 Feb 23;278(1720):3003–3008. doi: 10.1098/rspb.2010.2648

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Figure 1. — Relationship between length and maximum width in conifer seed cones and pollen cones through time. Seed cones produced by extinct members of the three major extant cone-producing families are specifically indicated (squares, Araucariaceae; triangles, Cupressaceae sensu lato; stars, Pinaceae). (a) Seed cones (black circles, n = 209) and pollen cones (grey circles, n = 292) of extant species. The line represents a one-to-one relationship between cone length and maximum cone width. (b) Seed cones of Palaeozoic (Pennsylvanian and Permian) and Triassic species (white symbols, n = 39); black circles represent extant seed cones for comparison. (c) Seed cones of Jurassic species (white symbols, n = 21); black circles represent extant seed cones for comparison. (d) Seed cones of Cretaceous species (white symbols, n = 41); black circles represent extant seed cones for comparison. (e) Pollen cones of all fossil species (Pennsylvanian through Cretaceous; white circles, n = 69) and extant species (grey circles).