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("Tillandsia utriculata group key by Juan Pinzon Thesis 2012 Translated by Butcher
)
Updated by Derek Butcher & Eric Gouda: 10-02-2020 10:35:46.
| 1 | Petals | white, cream or green | 2 |
| violet or reddish | 16 | ||
| 2 | Petals | white, cream or pale green, lighter than the sepals | 3 |
| apple green | 13 | ||
| 3 | Leaf rosette | caulescent | albida |
| acaulis | 4 | ||
| 4 | Leaf sheath | "merging gradually with the blade, which is tomentose lepidote on both sides; wings of the scales without toothed margins; floral bracts and sepals glabrous adaxially; inflorescence simple " | 5 |
| "distinct from blade, which is glabrous or adpressed lepidote abaxially; wings of the scales verrucose with crenate or entire margins; floral bracts and sepals lepidote adaxially; inflorescence usually paniculate" | 6 | ||
| 5 | Floral bracts | "abaxially glabrous, with a rounded tip; flowers adpressed to the rachis. | |
| "sparsely lepidote abaxially, with an acute or obtuse tip; the flowers are slightly separated from the rachis. | |||
| 6 | Plant | "Polycarpic with many basal offsets; leaf blade densely lepidote on both sides; | |
| "Monocarpic or polycarpic with axillary offsets; leaf blade sparsely lepidote or glabrous adaxially; plant epiphytic " | 8 | ||
| 7 | Leaves | "rigid, tip pungent; leaf blade more than 34 mm wide; inflorescence two or more times divided. Jamaica." | calcicola |
| "flexible, tip not pungent; leaf blade less than 18 mm wide; inflorescence divided once. Tamaulipas, San Luis Potosi, Queretaro, Hidalgo" | pringlei | ||
| 8 | Plant | "Polycarpic with axillary offsets; widespreading stigma lobes, not spiralling" | 9 |
| "Monocarpic; stigma strongly with spiralling lobes" | 11 | ||
| 9 | Floral bracts | "Average length of the floral bracts greater than 23.4 mm; length of the basal floral bracts more than 25.5 mm. On the Caribbean side of Belize to Nicaragua" | izabalensis |
| Average length of the floral bracts below 23.2 mm: length of the basal floral bracts less than 25.3 mm Gulf of Mexico and Yucatan Peninsula | 10 | ||
| 10 | Rosette | "funnel-shaped; leaves leathery, erect to arching, usually with a pungent tip; axis of the inflorescence and rachis scarlet red or pink; floral bracts scarlet red or green; branches erect to ascending, inserted in the rachis at an angle of about 45 °; occasionally with offsets in the inflorescence. Peninsula of Yucatan, Tabasco, Belice, Guatemala " | dasyliriifolia |
| "open; leaves flexible, recurved, tips not pungent; axis of the inflorescence andrachis carmine red violet-tinged; floral bracts violet-tinged; branches curved ascending,inserted in the rachis at an angle of about 90 °; offsets never present inflorescence. San Luis Potosi, Hidalgo, Puebla, Veracruz, Tabasco, Oaxaca, Chiapas." | limbata | ||
| 11 | Petals | "oblong with rounded tip; Anthers more than 3.8 mm long; average width of the floral bracts more than 6.1 mm; average width of the rachis more than 2.7 mm " | comitanensis |
| "spatulate with an acute tip; Anthers less than 3.6 mm long; average width of the floral bracts less than 5.9 mm; average width of the rachis less than 2.6 mm" | 12 | ||
| 12 | Flowers | "of more than 56 mm long (including the pistil); inflorescence divided once; axis of the inflorescence and rachis rose; average proportion length of internode of the rachis to the length of the floral bract, less than one. North-west of the Valle Central of Chiapas " | elusiva |
| "less than 52 mm in length (including the pistil); inflorescence usually twice divided; axis of the inflorescence and rachis green, scarlet red or dark violet; average proportion length of internode of the rachis to the length of the floral bract, greater than or equal to one. Florida, side of the Gulf of Mexico, Caribbean side of Mexico to Costa Rica, the Antilles, North Venezuela" | utriculata | ||
| 13 | Leaf Sheath | "indistinct from the blade which is tomentose lepidote on both sides; leaf blade width less than 16 mm; wings of the scales without toothed margins; floral bracts and sepals glabrous adaxially; inflorescence simple" | 5 |
| "distinct from the blade which is adpressed lepidote abaxially and glabrous or adpressed lepidote adaxially; width of blade greater than 17 mm; wings of the scales verrucose with crenate or entire margins; floral bracts and sepals lepidote adaxially; inflorescence commonly paniculate" | 14 | ||
| 14 | Plant | "Polycarpic with axillary offsets; leaves flexible; blades ribbed inconspicuously abaxially with scales distributed evenly on surface; stigma with extended lobes, not spirally. Caribbean side of Belize to Nicaragua" | izabalensis |
| "Monocarpic or polycarpic with basal offsets; leaves leathery to rigid; blades conspicuously ribbed abaxially, with scales distributed in rows in the valleys of the nerves; stigma with erect to slightly spiralled lobes. Pacific Ocean side, Jalisco (Mexico) to Puntarenas (Costa Rica)" | 15 | ||
| 15 | Anthers | "more than 5 mm long; leaves with coriaceous consistency, the more basal blades pendulous, floral bracts glaucous abaxially; petals with tip erect or slightly divergent; plants to the south of Oaxaca" | huamelulaensis |
| "less than 4.5 mm long; leaves with rigid brittle consistency, the more basal blades arched or erect; floral bracts bright abaxially; petals with slightly incurved tip; plants of the Pacific Ocean side, Jalisco (Mexico) to Puntarenas (Costa Rica)" | cucaensis | ||
| 16 | Floral bracts | "densely lepidote abaxially; plant lithophyte" | socialis |
| "glabrous abaxially; plant epiphyte" | 17 | ||
| 17 | Leaves | flexible, soft, tip not pungent. Valley of Tehuacan - Cuicatlan and areas adjacent | tehuacana |
| firm to rigid, tip pungent. Pacific side and mountain ranges in the West, Centre South Mexico areas | 18 | ||
| 18 | Axis | "Axis of the inflorescence, rachis, floral bracts and tip of the sepals red wine coloured; average length of the floral bracts greater than or equal to 3 times the width; petals more than 40 mm long, red, tip erect or slightly divergent; Anthers more than 3.5 mm long " | nicolasensis |
| "Axis of the inflorescence and rachis scarlet red or magenta color; floral bracts and tips of sepals scarlet red or red wine coloured, with or without violet tints; average length of the floral bracts less than 3 times the width; petals less than 39 mm long, without reddish tints, slightly incurved tip; Anthers less than 3.5 mm long" | 19 | ||
| 19 | Rosette | funnel shaped, higher than wide, average length of the floral bracts greater than 14.6 mm, petals more than 35 mm long. Central, Southern and Western Mexico, West of the Isthmus of Tehuantepec | makoyana |
| "about the same height and width; average of the length of the floral bracts less than 13.6 mm; petals less than 31 mm long. East of Oaxaca" | pinicola |