. Carnegie Institution of Washington publication. PTEROCACTUS. KEY TO SPECIES. Seeds narrowly winged; spines up to 2 cm. long Seeds broadly winged; spines 3 to 10 mm. long. Joints strongly tuberculate Joints scarcely tuberculate. Ovary densely covered with weak spines; wing of seed i mm. wide. Ovary loosely covered with stiff spines; wing of seed 2 mm. . i. P. liiikcnii . 2. P. fischeri 3- P. i 4. P. lubcrosus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
. Carnegie Institution of Washington publication. PTEROCACTUS. KEY TO SPECIES. Seeds narrowly winged; spines up to 2 cm. long Seeds broadly winged; spines 3 to 10 mm. long. Joints strongly tuberculate Joints scarcely tuberculate. Ovary densely covered with weak spines; wing of seed i mm. wide. Ovary loosely covered with stiff spines; wing of seed 2 mm. . i. P. liiikcnii . 2. P. fischeri 3- P. i 4. P. lubcrosus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
