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Key to Tillandsia
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=39597
2 Plants in dense, more or less spherical clusters; inflorescence scapose, exserted from the cluster, of (1-) 2 (-3) flowers; corolla violet | |
2 Plants in elongate, pendulous festoons; inflorescence sessile, of a single flower; corolla yellowish green | |
3 Leaves narrowly linear, 1-5 mm wide (-10 mm wide in T. floridana) when measured at mid-length. | |
4 Leaf sheaths slightly or not at all inflated, the plant not pseudobulbous; scapes 8-39 cm long. | |
9 Leaves 15-30, not over 0.5 cm wide at mid-length; inflorescence simple or 1-pinnate, with 1-5 branches | |
10 Leaf sheaths flat or slightly and broadly channeled, the plant not pseudobulbous (cylindrical or broadened-flaring upwards). | |
14 Leaves soft and brittle; inflorescence simple or with 1-3 branches; floral bracts 0.6-0.9 cm wide | |
14 Leaves tough and leathery; inflorescence palmately to pinnately branched, with 3-15 branches; floral bracts 1.2-2.0 cm wide. | |
15 Fertile spikes of inflorescence > 10 cm long; floral bracts often 3.0-4.8 cm long | |
15 Fertile spikes of inflorescence < 10 cm long; floral bracts 2-3 cm long. | |