| Micrograph No. |
Family |
Scientific name and Author(s) |
Aperturation |
Ornamentation |
| 577 |
Asteraceae |
Gaillardia pulchella Fougeroux |
tricolporate |
echinate |
| 578 |
Asteraceae |
Gaillardia suavis (Gray & Engelmann) Britton & Rusby |
tricolporate |
echinate |
| 579 |
Asteraceae |
Hymenopappus artemisiifolius DC. |
tricolporate |
echinate |
| 580 |
Asteraceae |
Solidago rugosa P. Miller |
tricolporate |
echinate |
| 581 |
Asteraceae |
- Helenium amarum (Rafinesque) H. Rock var. badium
- (Gray ex S. Watson) Waterfall
|
tricolporate |
echinate |
| 582 |
Asteraceae |
Isocoma drummondii (Torrey & Gray) Greene |
tricolporate |
echinate |
