Adonis

Adonis

* photo of unknown internet source

Adonis amurensis ( Pheasant's Eye )
Also called Amur Adonis. A perennial, reaching up to 1.5 x 1 ( rarely over 1 ) foot, native to eastern Russia, Manchuria, Korea and Japan.
The ferny foliage is lush and attractive until mid-summer when the plant goes dormant until the next spring. The foliage is glossy mid-green. The finely-cut leaves are up to 3 x 3.5 inches in size.
The abundant, bright yellow flowers, up to 3 ( rarely over 2 ) inches across, are borne during very early spring, often as the snow is melting.
Hardy zones 2 to 7 in full sun to partial shade on fertile soil. It is easy to grow. It is planted during the fall.

* excellent photo link
http://www.irisbg.com/gardenexpl_o/taxon-1693.aspx

'Fukuju Kai'
Deep yellow, double flowers.

Adonis vernalis ( Spring Adonis )
A perennial, reaching up to 1.3 feet, that is native to grasslands of Europe ( from Finland to Russia; south to Spain to Italy ). It typically goes dormant during early summer then disappears until the following spring.
The finely-cut leathery leaves are green.
The bright yellow flowers, up to 2.5 inches wide, are borne mid-spring to early summer. It typically begins to bloom 3 weeks after Adonis amurensis.
Hardy zones 3 to 7 in full sun to partial shade on sandy well drained soil. It is very drought tolerant during summer, though unfortunately very prone to slugs.

* photo of unknown internet source

Adonis volgensis ( Volga Adonis )
A perennial, reaching up to 1 foot, that is native to grasslands and alpine meadows in eastern Europe ( from Hungary & Romania to the Caucasus; south to northeast Turkey and Armenia ).
The finely-cut, dentate leaves are glossy bright green.
The bright yellow flowers, up to 1.5 inches wide, are borne mid-spring to early summer.
Hardy zones 5 to 7 on sandy, well drained soil. It is drought tolerant during summer. When massed planted, the best spacing is 7 to 10 inches apart. It can be sown from seed immediately after ripening during early summer. Seedlings take 2 years to bloom. Clumps do not like disturbance but can be carefully divided as they go dormant during early summer.