Rosinweed

rosinweeds
Silphium integrifolium
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Subfamily:	Asteroideae
Tribe:	Heliantheae
Genus:	Silphium L.
Type species
Silphium asteriscus L.

Silphium is a genus of North American plants in the sunflower tribe within the daisy family.

Members of the genus, commonly known as rosinweeds, are herbaceous perennial plants growing to 0.5–4 m tall, with yellow (rarely white) flowerheads. The name of the genus comes from the Ancient Greek word for a North African plant whose identity has been lost, though it is known its gum or juice was prized by the ancients as a medicine and a condiment.

numerous species now regarded as members of other genera: Berlandiera Verbesina

Silphium integrifolium (rosinweed) flowers

Silphium laciniatum (compass plant) leaves

Silphium perfoliatum (cup plant) flowers in Lower Saxony, Germany

Silphium terebinthinaceum (prairie dock) leaves

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Wikipedia