Assertion: swamp milkweed | /r/HasAspect | lower cardenolide levels
Facets:
value: naturally
type: MANNER
Source sentences:
text: In contrast, native swamp milkweed (A. incarnata) has naturally lower cardenolide levels, and when used as a control in the study mentioned above, it did not exhibit the same radical changes in toxicity as tropical milkweed.