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Symphyotrichum georgianum (formerly Aster georgianus) is a rare species of flowering plant in the Asteraceae, the aster family. Its common name is Georgia aster.[3] It is native to the southeastern United States where it is known from Alabama, Florida, Georgia, North Carolina, and South Carolina. As of 2013, it may be extirpated from the state of Florida.
Georgia aster is a robust rhizomatous perennial and herbaceous plant that produces colonies of woody stems up to 1 meter (3 feet 3 inches) tall. The thick, dark green leaves are up to 7 centimeters (2+3⁄4 inches) long by 2 cm (4⁄5 in) wide. They are oblong to lance-shaped with smooth or serrated margins. The flower heads are borne on rough-haired peduncles. The bracts are linear to lance-shaped.[4] The stems, leaves, and some parts of the flower heads are covered with tiny glands on tiny stalks called "stipitate glands". The flower heads are relatively large, up to 5–6 cm (2–2+3⁄8 in) across. Each ray floret is up to 2 cm (4⁄5 in) long and purple, described as "dark purple"[5] to "lavender violet to dark reddish purple". The disk florets at the center are white to purplish.[4] It blooms in October and November.[5]
Symphyotrichum georgianum is native to the southeastern United States where it is known from Alabama, Florida, Georgia, North Carolina, and South Carolina.[4] As of 2013, it may be extirpated from the state of Florida.[5]
It grows in oak-pine woodlands.[4][5] Its local region was once covered in a post oak-savanna, and this species was a member of this ecosystem. This type of plant community depends on natural disturbance, such as wildfire, now largely destroyed or degraded by fire suppression and the removal of certain large grazing mammals.[1][5] Georgia aster is therefore a relict species of this historic ecosystem and grows in remaining woodlands.[5]
Threats to the survival of the species include elimination of habitat disturbance such as fire, road construction, and herbicide application. As of 2013, only 146 populations were estimated to remain.[5]
Leaf and stem node
Involucre showing phyllaries and stipitate glands
Before pollination
After pollination
Symphyotrichum georgianum (formerly Aster georgianus) is a rare species of flowering plant in the Asteraceae, the aster family. Its common name is Georgia aster. It is native to the southeastern United States where it is known from Alabama, Florida, Georgia, North Carolina, and South Carolina. As of 2013, it may be extirpated from the state of Florida.
Symphyotrichum georgianum (anteriormente Aster georgianus) comúnmente conocida como aster de Georgia es una especie de planta con flores de la familia Asteraceae. Es originaria del sureste de Estados Unidos, se encuentra principalmente Alabama, Carolina del Norte, Carolina del Sur y Georgia, actualmente parece haberse extinguido en Florida.[1]
El aster de Georgia es una planta perenne rizomatosa robusta que produce colonias de tallos leñosos de hasta un metro de largo. Las hojas gruesas de color verde oscuro miden hasta 7 centímetros de largo por 2 centímetros de ancho, tienen forma de lanza con márgenes lisos o aserrados. Las cabezas de las flores miden de 5 a 6cm, nacen en pedúnculos glandulares de tricomas ásperos con brácteas lanceoladas, florece entre octubre y noviembre.
El aster de Georgia crece en bosques de robles y pinos, la región estuvo cubierta de una sabana con robles encinos, y esta especie era un miembro de este ecosistema. Este tipo de comunidad de plantas depende de las perturbaciones naturales, como los incendios forestales. Actualmente, ha sido destruida o degradada en gran medida por la extinción de incendios y la eliminación de algunos mamíferos de pastoreo de gran tamaño. El aster de Georgia es, por lo tanto, una especie relicta de este ecosistema histórico, y crece en los bosques remanentes, se estima que quedan unas 146 poblaciones. Las amenazas a su supervivencia incluyen la eliminación de fuegos naturales, la construcción de carreteras y la aplicación de herbicidas.[2]
Vista general.
Flores en detalle.
Hojas en detalle.
Semillas en detalle.
Recolección de semillas en Carolina del Norte.
Datos: Q7661730
Multimedia:
Especies: Symphyotrichum georgianum
Symphyotrichum georgianum (anteriormente Aster georgianus) comúnmente conocida como aster de Georgia es una especie de planta con flores de la familia Asteraceae. Es originaria del sureste de Estados Unidos, se encuentra principalmente Alabama, Carolina del Norte, Carolina del Sur y Georgia, actualmente parece haberse extinguido en Florida.
Symphyotrichum georgianum là một loài thực vật có hoa trong họ Cúc. Loài này được (Alexander) G.L.Nesom miêu tả khoa học đầu tiên.[1]
Symphyotrichum georgianum là một loài thực vật có hoa trong họ Cúc. Loài này được (Alexander) G.L.Nesom miêu tả khoa học đầu tiên.
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