Heartleaf milkweed, Asclepias cordifolia
Heartleaf milkweed seed 1 gram, Asclepias cordifoliaOne gram of Asclepias cordifolia seeds from northern California. Seeds collection occurred in the summer of 2017, August. Germination difficulty is high. Weekly freeze thaw cycle recommended to prepare the seed to germinate. Germination rate below 10% is probable. One gram packet is approximately 55 seeds +/-10 seeds. 
Heartleaf milkweed May 18, 2016
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View Heartleaf milkweed observations on iNaturalist
View Heartleaf milkweed plant information at Wildflower.org
View Heartleaf milkweed plant information at Plants.USDA.gov
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