Table 1.
Taxa examined in this study, recommendation, position in germplasm, environmental cluster, life history, and potential extreme characteristics.
| Taxa | Recommendation for Collection | Position in Germplasm | Range overlap with H. annuus | Environmental Cluster Assignment | Life History | Potential Extreme Characteristics Based on Different Ecological Niche Relative to H. annuus |
|---|---|---|---|---|---|---|
| H. annuus (wild) | Assessed to be well represented | Primary | NA | Cluster 1 | Annual | NA |
| H. anomalus | High priority | Secondary | Utah New Mexico | Cluster 3 | Annual | Low precipitation tolerance Tolerance to high pH |
| H. argophyllus | Medium priority | Secondary | Texas | Cluster 1 | Annual | High temperature tolerance |
| Tolerance to high clay content | ||||||
| H. arizonensis | Medium priority | Tertiary | Arizona New Mexico | Cluster 3 | Perennial | Response to stochastic climate Low precipitation tolerance Tolerance to low bulk density |
| H. atrorubens | Medium priority | Tertiary | No overlap | Cluster 2 | Perennial | Tolerance to low |
| Cation-exchange capacity | ||||||
| Tolerance of high precipitation | ||||||
| Tolerance to low pH | ||||||
| H. bolanderi | High priority | Secondary | California | Cluster 1 | Annual | Tolerance to erratic precipitation |
| Low precipitation tolerance | ||||||
| H. debilis subsp. cucmerifolius | High priority | Secondary | East Texas | Cluster 2 | Annual | High temperature tolerance |
| H. debilis subsp. debilis | Medium priority | Secondary | No overlap | Cluster 2 | Annual | High temperature tolerance |
| Tolerance of high precipitation | ||||||
| Tolerance to low clay content | ||||||
| H. debilis subsp. silvestris | Medium priority | Secondary | No overlap | Cluster 2 | Annual | Tolerance to high clay content |
| H. debilis subsp. tardiflorus | Assessed to be well represented | Secondary | No overlap | Cluster 2 | Annual | Tolerance of high precipitation Tolerance to low clay content |
| H. debilis subsp. vestitus | Low priority | Secondary | No overlap | Cluster 2 | Annual | High temperature tolerance Tolerance of high precipitation |
| Tolerance to low clay content | ||||||
| H. deserticola | High priority | Secondary | Nevada | Cluster 3 | Annual | Response to stochastic climate |
| Utah | Low precipitation tolerance | |||||
| New Mexico | ||||||
| H. divaricatus | High priority | Tertiary | Central US | Cluster 2 | Perennial | Perennial habit |
| Tolerance to low pH | ||||||
| H. exilis | Medium priority | Secondary | California | Cluster 1 | Annual | Tolerance to erratic precipitation |
| Low precipitation tolerance | ||||||
| Low bulk density | ||||||
| H. giganteus | High priority | Tertiary | No overlap | Cluster 2 | Perennial | Tolerance of high precipitation |
| H. grosseserratus | Medium priority | Tertiary | Central US | Cluster 3 | Perennial | Tolerance to erratic temperature |
| H. hirsutus | High priority | Tertiary | Central US | Cluster 2 | Perennial | Tolerance to low pH |
| H. maximilliani | High priority | Tertiary | Central US | Cluster 3 | Perennial | Low temperature tolerance |
| Tolerance to erratic temperature | ||||||
| H. neglectus | Assessed to be well represented | Secondary | New Mexico | Cluster 1 | Annual | Low organic carbon content |
| H. niveus subsp. canescens | High priority | Secondary | California Arizona New Mexico |
Cluster 1 | Annual Rarely Perennial |
High temperature tolerance Low precipitation tolerance |
| H. niveus subsp. niveus | High priority | Secondary | Baja California | Cluster 1 | Perennial | Low precipitation tolerance |
| H. niveus subsp. tephrodes | High priority | Secondary | California, Mexico (Sonora) | Cluster 1 | Perennial Sometime Annual | High temperature tolerance low Precipitation tolerance |
| H. paradoxus | Assessed to be well represented | Secondary | Texas, New Mexico | Cluster 1 | Annual | Low organic carbon content |
| H. pauciflorus subsp. pauciflorus | High priority | Tertiary | Central US | Cluster 3 | Perennial | Tolerance to erratic temperature |
| H. pauciflorus subsp. subrhomboideus | High priority | Tertiary | Central US | Cluster 3 | Perennial | Low temperature tolerance Tolerance to erratic temperature |
| H. petiolaris subsp. fallax | High priority | Secondary | Western US | Cluster 3 | Annual | Tolerance to erratic temperature |
| H. petiolaris subsp. petiolaris | High priority | Secondary | Central US | Cluster 3 | Annual | Tolerance to erratic temperature Low temperature tolerance |
| H. praecox subsp. hirtus | Assessed to be well represented | Secondary | West Texas | Cluster 1 | Annual | High temperature tolerance |
| H. praecox subsp. praecox | Assessed to be well represented | Secondary | East Texas | Cluster 2 | Annual | Tolerance to erratic temperature |
| H. praecox subsp. runyonii | Low priority | Secondary | Texas | Cluster 1 | Annual | Tolerance of high bulk density |
| H. resinosus | Medium priority | Tertiary | No overlap | Cluster 2 | Perennial | Tolerance of high precipitation |
| Tolerance to low | ||||||
| Cation exchange capacity Tolerance to low pH | ||||||
| H. salicifolius | Medium priority | Tertiary | Oklahoma Kansas Arkansas Missouri | Cluster 3 | Perennial | Tolerance to high clay content |
| H. silphioides | Assessed to be well represented | Tertiary | Oklahoma Arkansas Missouri | Cluster 2 | Perennial | Tolerance to low cation-exchange capacity Tolerance to low pH |
| H. strumosus | High priority | Tertiary | Central US | Cluster 2 | Perennial | Tolerance of high precipitation |
| H. tuberosus | Medium priority | Secondary | Central US | Cluster 2 | Perennial | Low temperature tolerance |
| H. winteri | High priority | Primary | California | Cluster 1 | Perennial | High temperature tolerance |