| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Arabidopsis lyrata ssp. lyrata (L.) O'Kane & Al-Shehbaz | 0 | 2 | 0 |
| Arabis | 1 | 0 | 0 |
| Arabis lyrata | 0 | 0 | 0 |
| Araceae | 2 | 4 | 0 |
| Arctostaphylos | 1 | 0 | 0 |
| Arctostaphylos uva ursi | 0 | 0 | 0 |
| Arctostaphylos coloradensis Rollins | 0 | 2 | 0 |
| Arisaema | 1 | 2 | 0 |
| Arisaema triphyllum (L.) Schott | 0 | 2 | 0 |
| Artemisia | 1 | 2 | 0 |
| Artemisia campestris ssp. caudata | 0 | 2 | 0 |
| Asclepiadaceae | 1 | 0 | 0 |
| Asclepias | 1 | 0 | 0 |
| Asclepias incarnata L. | 0 | 2 | 0 |
| Asteraceae | 9 | 19 | 0 |
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