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Scaevola

Scaevola
Scaevola

Scaevola

For the Roman name, see Mucius Scaevola. For the fossil gastropod genus, see Scaevola (mollusc). For the 1958 US nuclear test, see Operation Hardtack.

Scaevola is a genus of flowering plants in the Goodenia family, Goodeniaceae. It consists of more than 130 tropical species, with the center of diversity being Australia and Polynesia, including Hawaii.

Common names for Scaevola species include scaevolas, fan-flowers, half-flowers, and naupaka, the plant's Hawaiian name. The flowers are shaped as if they have been horizontally cut in half. Consequently, the generic name means "left-handed" in Latin. Many legends have been told to explain the formation of the naupaka's unique half flowers. In one version a woman tears the flower in half after a quarrel with her lover. The Gods, angered, turn all naupaka flowers into half flowers and the two lovers remained separated while the man is destined to search in vain for another whole flower.[1] Scaevola sericea in Rangareddy district of Andhra Pradesh, India. Scaevola is the only Goodeniaceae genus that is widespread outside of Australia. In at least six separate dispersals, about 40 species have spread throughout the Pacific Basin, with a few reaching the tropical coasts of the Atlantic and Indian Oceans.

The Hawaiian Islands are home to ten Scaevola species, nine of which are endemic.[2] Eight of the indigenous species are the result of a single colonization event. Scaevola glabra and Scaevola taccada arrived separately to produce a total of three colonizations of Hawaii by Scaevola. Some of the endemic species are of hybrid origin. [3]

Beach Naupaka (Scaevola taccada synonym S. sericea) occurs throughout the Pacific and Indian Oceans and is an invasive species in Florida, USA, and in some islands of the Caribbean including the Cayman Islands[4] and the Bahamas. Beachberry or Inkberry (Scaevola plumieri) is widespread in the tropical Americas and Africa; however, it is becoming rarer in areas where S. taccada is displacing native coastal plants.

Most Australian Scaevola have dry fruits and sprawling, herbaceous to shrubby habits. By contrast, nearly all species outside Australia have shrub habits with fleshy fruit making dispersal by frugivores easy.

The plant pathogenic sac fungus Mycosphaerella scaevolae was discovered on a Scaevola fan-flower.

Contents


Selected species

Scaevola coriacea (Dwarf Naupaka) at Lili?uokalani Botanical Garden, Honolulu
Flowers of Scaevola taccada (Beach Naupaka)
Flowers of Scaevola taccada (Beach Naupaka)
Scaevola plumieri with ripe and unripe drupes  at Honeymoon Island State Park, Dunedin, Florida

Notes

References

  • (2003): Phylogenetics of the genus Scaevola (Goodeniaceae): implication for dispersal patterns across the Pacific Basin and colonization of the Hawaiian Islands. Am. J. Bot. 90(6): 915-213. PDF fulltext Supplemental data

External links

de:Fächerblumen es:Scaevola fr:Scaevola ru:??????? to:Ngahu


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