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Key to Echinocereus
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=41092
1 Stem length 8-50× the stem diameter; stems erect to clambering or sprawling on supporting vegetation | |
2 Stem length 3-8× the stem diameter; stems semiprostrate to decumbent. | |
2 Stem length 1-3× the stem diameter; stems erect or ascending. | |
10 Spines microscopically with strongly tuberculate surfaces; [granite & sandstone outcrops around the Llano Uplift of c. TX] | |
10 Spines microscopically with finely grooved surfaces; [limestone outcrops in c. TX] |