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("Key to small Mexican Tillandsias (to 10-15cm diam) with green, greenish-yellow petals and included stamens.
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Updated by Derek Butcher & Eric Gouda: 10-02-2020 10:35:46.
| 1 | Plant | caulescent | 2 |
| stemless | 5 | ||
| 2 | Peduncle | Visible and substantial | 3 |
| Hardly visible and very short | 4 | ||
| 3 | Spike | complanate with distichous flowers | tortilis v. tortilis |
| tubular with polystichous flowers, Leaves secund | curvifolia | ||
| 4 | Plant | open, Inflorescence mainly simple, Spike short and wide | lepidosepala |
| dense rosette 15x 12cm wide. Inflorescence compound densely capitate | atroviridipetala var yagulensis | ||
| 5 | Plant | a dense flattened rosette | 6 |
| a bulbose rosette | 14 | ||
| 6 | Leaves | evenly reflexed | 7 |
| secund | 13 | ||
| 7 | Trichomes | feathery, Primary bracts longer than the spikes that are 1-3 flowered | plumosa |
| not feathery | 8 | ||
| 8 | Peduncle | missing | 9 |
| short | 11 | ||
| 9 | Spikes | mainly one flowered | atroviridpetala var atroviridipetala |
| 4 – 12 flowered, to 5cm long | grandispica | ||
| 10 | Inflorescence | mainly with single spike | teloloapanensis |
| with 2-6 spikes | 11 | ||
| 11 | Leaf Sheath | forming a bulb | atroviridipetala var. longepedunculata |
| densely pressed together | mauryana | ||
| 12 | Inflorescence | to 7 spikes | 13 |
| one spike | penascoensis | ||
| 13 | Floral Bracts & sepals | almost glabrous | boqueronensis |
| dense lepidote | mauryana fa. secundifolia | ||
| 14 | Inflorescence | mainly simple distichous narrow lanceolate spike but sometimes with 1-2 smaller side spikes | ignesiae |
| compound 3-7 spikes each to 7 flowered, leaves wavy after first 1cm, primary bracts shorter than spikes | caballoensis |