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Leaves 2-ranked; inflorescence 1--2(--3)-flowered. |
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(2) |
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Leaves many-ranked; inflorescence more than 3-flowered. |
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(3) |
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| 2 (1) |
Stems elongate, plants forming pendent festoons; inflorescence reduced to single, apparently sessile flower, scape concealed within leaf sheath; petals yellow-green |
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1 Tillandsia usneoides |
| + |
Stems short, plants densely clustered to form spheric masses; inflorescence of (1--)2(--3) flowers, scape conspicuous; petals violet |
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2 Tillandsia recurvata |
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| 3 (1) |
Floral bracts spreading and / or small, exposing most of rachis at anthesis. |
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(4) |
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Floral bracts imbricate, broad, covering all or most of rachis, rachis not visible at anthesis. |
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(5) |
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| 4 (3) |
Leaves 10--20, spirally twisted, banded silver; floral bracts 2.3--3.1 cm; inflorescences with 2--6 flowers per branch; corolla pink to dark rose |
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14 Tillandsia flexuosa |
| + |
Leaves greater than 20 in number, not twisted or banded (rarely variegated with linear cream stripes); floral bracts 1.2--2 cm; inflorescence with 6--11 flowers per branch; corolla white |
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15 Tillandsia utriculata |
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| 5 (3) |
Leaf sheath conspicuously inflated; plants pseudobulbous. |
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(6) |
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Leaf sheath flat or only slightly inflated; plants not pseudobulbous. |
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(10) |
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| 6 (5) |
Leaf blade channeled to involute; scapes 8--35 cm; floral bracts glabrous to inconspicuously scaly near apex only. |
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(7) |
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Leaf blade involute; scapes 1--15 cm; floral bracts densely scaly. |
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(8) |
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| 7 (6) |
Leaf blade and scape bracts twisted, reflexed |
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6 Tillandsia balbisiana |
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Leaf blade and scape bracts erect to spreading |
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7 Tillandsia x smalliana |
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| 8 (6) |
Scape 7--15 cm; plants from extreme s Texas |
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3 Tillandsia baileyi |
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Scape 6 cm or less; plants from Florida. |
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(9) |
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| 9 (8) |
Inflorescence linear to narrowly elliptic; base of floral bracts visible at anthesis |
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4 Tillandsia paucifolia |
| + |
Inflorescence broadly elliptic; base of floral bracts not visible at anthesis |
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5 Tillandsia pruinosa |
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| 10 (5) |
Leaf blade obviously narrowly triangular, tapering evenly from base to apex. |
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(11) |
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Leaf blade linear-triangular to filiform. |
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(12) |
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| 11 (10) |
Leaves soft, brittle; inflorescence simple or laxly 2--3 branched, never palmate; floral bracts 0.6--0.9 cm wide |
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12 Tillandsia variabilis |
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Leaves stiff, leathery; inflorescence densely palmate to laxly 2(--3)-pinnate with 3--15 branches; floral bracts 1.2--2 cm wide |
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13 Tillandsia fasciculata |
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| 12 (10) |
Leaf sheath narrowly elliptic, 1.2--2 cm wide, slightly inflated |
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8 Tillandsia simulata |
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Leaf sheath broadly elliptic to triangular, 0.8--2.5 cm wide, flat. |
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(13) |
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| 13 (12) |
Leaves finely appressed-scaly, appearing green to reddish green; sheath of scape bracts, especially distal ones, narrowing abruptly into blade; floral bracts green or tinged red, uniformly scaly; corolla lavender |
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9 Tillandsia setacea |
| + |
Leaves densely and coarsely appressed-scaly, appearing gray; sheath of scape bracts narrowing gradually into blade; floral bracts uniformly red to rose, scaly distally, becoming sparsely scaly toward base; corolla violet. |
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(14) |
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| 14 (13) |
Leaves 15--30, not over 0.5 cm wide at mid-length; inflorescence simple or with 1--5 lateral branches |
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10 Tillandsia bartramii |
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Leaves 20--50, 0.5--1 cm wide at mid-length; inflorescence 2-pinnate with 2--10 lateral branches |
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11 Tillandsia x floridana |
