| Entry | Volume | Pages |
|---|---|---|
| Houstonia angustifolia | 10 | 77 |
| Houstonia caerulea | 5 | 163 |
| Houstonia caerulea | 36 | 79 |
| Houstonia caerulea | 51 | 257 |
| Houstonia caerulea | 54 | 276 |
| Houstonia caerulea | 56 | 12 |
| Houstonia caerulea | 74 | 38 |
| Houstonia caerulea var. faxonorum | 55 | 90 |
| Houstonia caerulea 'Millard's Var.' | 2 | 5 |
| Houstonia caerulea 'Millard's Var.' | 16 | 332A.M. |
| Houstonia caerulea 'Millard's Var.' | 25 | 290 |
| Houstonia caerulea 'Millard's Var.' | 34 | 290 |
| Houstonia caerulea 'Millard's Var.' | 58 | 213 |
| Houstonia fasciculata | 10 | 77 |
| Houstonia rotundifolia | 18 | 40 |
| Houstonia rubra | 10 | 75P, 77 |
| Houstonia rubra | 18 | 40 |
| Houstonia wrightii | 16 | 17 |