Vernonia

Plant Characteristics

Cultivation

Scientific Names

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Vernonia is a genus of about 1000 species of forbs and shrubs in the family Asteraceae. Some species are sometimes known as ironweeds. Some species are edible and of economic value. They are known for having intense purple flowers. The genus is named for English botanist William Vernon. Several species of Vernonia, including V. calvoana, V. amygdalina, and V. colorata, are eaten as leaf vegetables. Common names for these species include bitterleaf, ewuro, and ndole.

Read about Vernonia in the Standard Cyclopedia of Horticulture

Vernonia (after Wm. Vernon, an English botanist who traveled in North America). Compositae. Iron-weed. Perennial herbs or in the tropics shrubs and trees. Leaves alternate, pinnately veined: fls. usually purple or rose, borne in the following species in terminal cymes: heads not glomerate, several to many exclusively tubular-fid.: involucre of dry or partly herbaceous, much-imbricated bracts: corolla regularly 5-cleft into narrow lobes: achenes 8-10-ribbed, with a blunt apex and a cartilaginous, callous base; pappus double (at least in American species).—About 560 species widely scattered about the world, but is possibly most plentiful in S. Amer. The latest monograph is that by H. A. Gleason in Bull. N. Y. Bot. Gard. 4:144-243, 1906. The following species are native of the U. S., and are hardy perennial herbs of attractive appearance, with rather large heads of purple fls. in terminal clusters in late summer or early fall. Vernonias are of easy cult. in any good, rich border, being easily prop. by division. Very satisfactory groupings can be made with vernonias and native asters and goldenrods. V. Arechavaletae, Andre. Glabrous shrub, 3-6 ft. high: lvs. sessile, leathery, linear-lanceolate: fl.-heads reddish violet. Uruguay. —V. gigantea. Hort. Robust: fl. -heads in panicles, carmine or violet-rose. The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

Cultivation

Species

Ironweed (Veronia altissima)

There are numerous distinct subgenra and subsections in this genus. This has lead some botanists to divided this large genus into smaller groups which separate the species into distinct genra.

Species of this genus are found in South America, Africa, s.e. Asia, and North America. Vernonia species are well known for hybridizing between similar species in areas of overlapping ranges. There are approximately 1000 species of Vernonia, a partial species list is given below. Click here for a full species list.

North America:

• Vernonia acaulis
• Vernonia altissima
• Vernonia arkansana
• Vernonia angustifolia
• Vernonia baldwinii
• Vernonia blodgettii
• Vernonia fasciculata
• Vernonia flaccidifolia
• Vernonia gigantea
• Vernonia glauca
• Vernonia larseniae
• Vernonia lettermannii
• Vernonia lindheimeri
• Vernonia marginata
• Vernonia missurica
• Vernonia noveboracensis
• Vernonia pulchella
• Vernonia texana

Africa:

• Vernonia amygdalina
• Vernonia calvoana
• Vernonia colorata
• Vernonia galamensis
• Vernonia staehelinoides

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

External links

• w:Vernonia. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
• Vernonia QR Code (Size 50, 100, 200, 500)