This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Erect, annual or perennial herbs. Leaves alternate, pinnately dissected into numerous linear segments. Flowers yellow or red, solitary, terminal. Petals 5-16, conspicuous. Carpels ∞, 1-ovuled. Achenes capitate or spicate, rugose-reticulated, tipped with the persistent styles. [Mythological name for a favorite of Venus, changed into a flower.]
A genus of showy-flowered plants, natives of the north temperate regions of Europe and Asia, consisting of the following and about five other species. Type species: Adonis annua L.
Adonis annua L. Sp. Pl. 547. 1753.
Adonis autumnalis L. Sp. Pl. Ed. 2, 771. 1763.
Annual, erect, 1°-2° high, branched, glabrous. Leaves finally dissected, the lower petioled, the upper sessile, the segments acute; sepals smooth, deciduous; flowers 9"-18" broad, nearly globular, orange or red, the petals obovate, and darker colored at the base; achenes spicate.