Antirrhinum

Antirrhinum is a genus of plants that used to be the family Scrophulariaceae, more commonly known as snapdragons from the flowers' fancied resemblance to the face of a dragon that opens and closes its mouth when properly squeezed (thus the 'snap'). Study of DNA sequences have led to the inclusion of Antirrhinum in a vastly enlarged family Plantaginaceae.

Taxonomy

The taxonomy of this genus is disputed at present. At one extreme, ITIS recognises only the Old World species of sect. Antirrhinum in the genus, listing only the Garden Snapdragon A. majus (the only species in the section naturalised in North America). At the other, Thompson (1988) treated 36 species in the genus; many modern botanists accept this circumscription. New species also continue to be discovered (see e.g. Romo et al., 1995).

Recent research in the molecular systematics of this group, and related species, by Oyama and Baum (2004), has confirmed that the genus as described by Thompson is monophyletic, provided that one species (A. cyathiferum) is removed to a separate genus, and two others (previously listed as Mohavea confertiflora and M. breviflora) are included. The species list at the right follows these conclusions. It is widely agreed that this broad group should be subdivided into three or four subgroups, but the level at which this should be done, and exactly which species should be grouped together, remain unclear. Some authors continue to follow Thompson in using a large genus Antirrhinum, which is then divided into several sections; others treat Thompson's genus as a tribe or subtribe, and divide it into several genera.

If the broad circumscription is accepted, its sections are as follows:

Section Antirrhinum: about 20 Old World species of perennial plants, the type Antirrhinum majus, mostly native to the western Mediterranean region with a focus on the Iberian Peninsula.
Section Orontium: two to six species, also Mediterranean. The species in this section, including the type Lesser Snapdragon A. orontium, are often treated in the genus Misopates.
Section Saerorhinum: about 16 New World species, mostly annual plants and mostly native to California, though species are found from Oregon to Baja California Sur and as far east as Utah. Like other authors, Thompson placed A. cyathiferum in this section, but Oyama and Baum, following earlier authors, suggest that it should be reclassified in genus Pseudorontium, while Mohavea confertiflora and M. breviflora should be included. Some authors classify the species in this section into the genera Sairocarpus, Howelliella and Neogaerrhinum.

The Garden Snapdragon is an important garden plant; cultivars of this species have showy white, crimson, or yellow bilabiate flowers. It is also important as a model organism in botanical research, and its genome has been studied in detail.

While Antirrhinum majus is the plant that is usually meant if the word "snapdragon" is used on its own, many other species in the genus, and in the family Scrophulariaceae more widely, have common names that include the word "snapdragon".

Growth

Snapdragons are annual plants and do best in full or partial sun. They are available in a range of heights: dwarf (6-8 inches), medium (15-30 inches) and tall (30-48 inches). Plant them in a soil that drains well to prevent the roots from rotting.

External links

The Antirrhinum majus genetic and phenotypic database is located at: http://www.antirrhinum.net [1]

References

Oyama, R. K., & Baum, D. A. (2004). Phylogenetic relationships of North American Antirrhinum (Veronicaceae). American Journal of Botany 91: 918-925.
Romo, A., Stubing, G., & Peris, J. B. (1995). A new species of Antirrhinum (Scrophulariaceae) from North Morocco. Annales Botanici Fennici 32: 165-168.
Thompson, D. M. (1988). Systematics of Antirrhinum (Scrophulariaceae) in the New World. Systematic Botany Monographs 22.
D. C. Albach, H. M. Meudt and B. Oxelman - Piecing together the "new" Plantaginaceae; American Journal of Botany. 2005;92:297-315.

Gallery

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</gallery> <gallery> Image:Antirrhinum majus1.jpg Image:Antirrhinum majus2.jpg Image:Antirrhinum majus3.jpg Image:Antirrhinum majus4.jpg </gallery> <gallery> Image:Antirrhinum majus5.jpg Image:Antirrhinum majus6.jpg Image:Antirrhinum majus7.jpg </gallery>

The actual descriptive text portion of the article above (and its Contents menu) are licensed under the GNU Free Documentation License then in effect published by the Free Software Foundation. The text article uses material from http://en.wikipedia.org/wiki/Antirrhinum (retrieval date: 2007-05-27) and is provided "as-is" and without warranty. Permission is granted to copy, distribute and/or modify only the actual descriptive text portion of the article above (and its Contents Box) under the GNU Free Documentation License. A copy of the license is available at: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License. Any advertisements (or active links not embedded in the actual article) and the layout or selection thereof are excluded from such license.
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