| Lalexia Luer, 2011 |
| Lalexia quadrifida (Lex.) Luer, 2011 |
| Lankesteriana Karremans, 2014 |
| Lankesteriana abbreviata (Schltr.) Karremans, 2014 |
| Lankesteriana barbulata (Lindl.) Karremans, 2014 |
| Lankesteriana comayaguensis (Ames) Karremans, 2014 |
| Lankesteriana glandulosa Archila & Szlach., 2014 |
| Lankesteriana greenwoodii (Soto Arenas & Salazar) Solano, 2023 |
| Lankesteriana haberi (Luer) Karremans, 2014 |
| Lankesteriana involuta (L.O. Williams) Karremans, 2014 |
| Larnandra Raf., 1825 |
| Larnandra conopsea (R. Br.) Raf., 1837 |
| Larnandra magnolia (Muhl.) Raf., 1825 |
| Leaoa Schltr. & Porto, 1922 |
| Leaoa hondurensis (Ames) Brieger, 1976 |
| Lemboglossum Halb., 1984 |
| Lemboglossum apterum (Lex.) Halb., 1984 |
| Lemboglossum bictoniense (Bateman) Halb. ex Christenson, 1989 |
| Lemboglossum candidulum (Rchb. f.) Halb., 1984 |
| Lemboglossum cervantesii (Lex.) Halb., 1984 |