Genus: Corydalis

Corydalis

Photo/Illustration: 
C. Colston Burrell
(Corydalis)
kor-ID-ah-liss
Papaveraceae
Corydalis are lovely plants with ferny foliage and distinct flowers that are well suited to a wide range of garden habitats. The 4-petaled flowers cover a wide spectrum of colors, including blue and coral. They are unusual and tubular, and are often held perpendicular to the foliage, giving the impression of a swimming school of colorful tadpoles. The outer pair of petals has a spur with reflexed tips, and the inside pair discreetly covers the stamens. 
Care:  Depends upon the species. Grow sun-loving species in a rock garden or in an alpine house, and shade-loving species in a woodland border or naturalized in the understory.
Propagation: 

Sow seed when fresh; germination may be erratic. Divide spring-flowering species in fall, and summer-flowering species in spring.

Species, varieties and clutivars for genus Corydalis

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Scrambled eggs
Corydalis aurea
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Corydalis cheilanthifolia
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Corydalis curviflora var. rosthornii 'Heronswood Form'
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Corydalis elata
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Corydalis flexuosa
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Corydalis flexuosa 'Blue Panda'
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Corydalis flexuosa 'China Blue'
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Corydalis flexuosa 'Purple Leaf'
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Corydalis linstowiana
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Yellow corydalis
Corydalis lutea
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Corydalis ochroleuca
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Scouler's fumeroot
Corydalis scouleri
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Fumewort
Corydalis solida
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Corydalis ‘Blackberry Wine’
Problems: 

Downy mildew, rust, aphids, slugs, snails; spider mites indoors.