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Vernicia Fordii ‘Anna Bella’, a New Georgia, Texas, Washington, DC, Tennessee, South Carolina, Florida, and Mississippi

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Vernicia Fordii ‘Anna Bella’, a New Georgia, Texas, Washington, DC, Tennessee, South Carolina, Florida, and Mississippi CULTIVAR AND GERMPLASM RELEASES HORTSCIENCE 48(1):123–125. 2013. it does not produce tung nuts. It was propa- gated by bud grafting in 2005 for evaluation by university and nursery cooperators in Vernicia fordii ‘Anna Bella’, a New Georgia, Texas, Washington, DC, Tennessee, South Carolina, Florida, and Mississippi. Ornamental Tung Tree ‘Anna Bella’ was released in 2012 by T. 1 Rinehart after evaluation for ornamental Timothy A. Rinehart , Ned C. Edwards, and James M. Spiers qualities and sterility. USDA-ARS, Thad Cochran Southern Horticultural Laboratory, 810 Highway Vernicia fordii ‘Anna Bella’ is a decidu- 26 West, Poplarville, MS 39470 ous, multistemmed, upright tung tree with an umbrella canopy. Trees are oval and sym- Additional index words. Vernicia fordii, Aleurites fordii, tung oil tree, tung nut metrical. Mature trees can reach 12.0 m tall and 10.0 m wide after 30 years of growth (Fig. 1). Bark is smooth and grayish reddish Despite their floral display and tropical children, and the possibility of invasiveness. brown [Royal Horticultural Society (RHS) foliage, ornamental use for tung trees has In four years of observations, peak flowering N200B; Royal Horticultural Society, 1986]. been limited by the production of tung nuts, for ‘Anna Bella’ occurs 4 weeks later when New stem growth is rapid and strong yellow- which are large, heavy, and toxic. ‘Anna compared with popular tung tree cultivars for ish green in color (RHS 144A). Trees are Bella’ is a semisterile, or nutless, tung tree tung oil production such as ‘Folsom’ and softwood and may shatter in high winds. selection that significantly reduces home- ‘Isabel’. ‘Anna Bella’ is the first ornamental Leaves are alternate, simple, and moder- owner concerns about mowing and toxicity tung tree selection released by the USDA- ate olive green (RHS 146A) on an adaxial to pets and children. Sterility also reduces the ARS Southern Horticultural Research Unit. leaf surface and moderate yellowish green on possibility of invasiveness. ‘Anna Bella’ is an abaxial leaf surface (RHS 147B). Leaves the first and only ornamental tung tree selec- Origin and Description are pointed, ovate–cordate, on long stalks tion available to landscape professionals and with red glands at the top of each petiole. homeowners and is recommended for USDA ‘Anna Bella’ was collected in the 1950s cold hardiness zones 8 to 10. from unknown sources because of its late The Thad Cochran Southern Horticultural flowering. In this respect, it was an ideal Laboratory (TCSHL) was formerly the USDA candidate to be used in the tung breeding Tung Oil Research Station in the 1940s, 1950s, program for delayed flowering. It has a typical and 1960s and maintains the most extensive growth habit, flower numbers, and environ- Vernicia fordii (Hemsl.) Airey Shaw (syn. mental tolerances. Unfortunately, it was not Aleurites fordii Hemsl.) germplasm collec- used in the tung improvement breeding pro- tion in the United States that includes historic gram because it lacked fertility and did not breeding lines and cultivars used in commer- appear to produce seed. Many years later, cial tung oil production. This collection in- germplasm from the tung collection was cludes trees that are late-flowering and were screened for ornamental use and ‘Anna used as parents in a USDA-ARS tung tree Bella’ was selected for evaluation because breeding program to delay flowering and prevent freeze damage to commercial tung oil orchards. Tung germplasm has been con- served by the USDA Agricultural Research Service in Poplarville, MS, for the last 50 years although the mission of the research Fig. 2. Floral displays consist of 50 to 80 flowers in station transitioned to small fruits in 1971. terminal clusters on branches. Buds are set in The germplasm collection was screened for late summer. Leaves emerge slightly before ornamental use and ‘Anna Bella’ was selected blooms. Staminate flowers typically emerge first over 1 to 2 weeks and drop off the tree as for evaluation. pollen dries, making a carpet of blooms on the Although they have not been shown to ground around the tree. One to five pistillate displace native flora, tung trees persist in fence flowers are generally located in the center of the rows and along roadsides and are classified as cluster, which is usually 25 to 30 cm in di- mildly invasive in parts of Florida (Langeland ameter. Depending on the wind and humidity, and Craddock Burks, 2008). Some specimens trees bloom for 30 to 40 d with peak bloom have been retained or planted in landscapes display lasting 2 weeks. as ornamental trees because they flower pro- fusely in early spring. Tung nuts are large, 8.0 cm in diameter, heavy, and toxic making them a nuisance for homeowners. ‘Anna Bella’ is a semisterile, or nutless, tung tree selection that significantly reduces concerns about mow- ing and yard maintenance, toxicity to pets and Received for publication 11 Sept. 2012. Accepted Fig. 1. Mature trees can reach heights of 12 m with for publication 1 Nov. 2012. an umbrella-shaped canopy. Trees may be Mention of trade names or commercial products in damaged from high winds because they are Fig. 3. Individual flowers are either staminate (A) this article is solely for the purpose of providing softwood. However, trees grow rapidly and or pistillate (B). Blooms average 4.0 cm in specific information and does not imply recom- recover quickly from pruning or limb removal. diameter with five white petals. Stamens are mendation or endorsement by the U.S. Department The ‘Anna Bella’ specimen pictured is more typically pink or orange color with yellow of Agriculture. than 30 years old and withstood wind gusts in pollen visible. Styles on pistillate flowers may 1To whom requests should be addressed; excess of 130 miles an hour during Hurricane be light green. Flowers have light pink or e-mail [email protected]. Katrina in Aug. 2005. orange striping in the throat. HORTSCIENCE VOL. 48(1) JANUARY 2013 123 Most leaves are unlobed and heart-shaped but or clusters consist of 50 to 80 flowers that many staminate flowers. Observations of sometimes with lobes on one or both sides. make an impressive floral display similar to bloom type on mature ‘Anna Bella’ trees Leaves emerge just before flowering on catalpa or dogwood. Tung trees are monecious in 2009 indicate that 8.2% of the flowers are ‘Anna Bella’ and are strong yellowish green and inflorescences usually contain both sta- pistillate (214 of 2608), which is comparable at the time of flowering (RHS 144A) on the minate and pistillate flowers, often with only to ‘Isabel’, a tung cultivar grown for tung oil adaxial leaf surface and moderate yellowish one or few pistillate flowers surrounded by production that displayed 8.4% pistillate green on the abaxial leaf surface (RHS flowers (145 of 1730 flowers). Flower buds 146C). are set during the previous season and may Inflorescences are terminal, solitary, and be affected by vigor and/or freeze damage consist of multibranched corymbiform thyr- during winter. soid panicles (Fig. 2). These panicled cymes Flowers may be slightly zygomorphic but typically have five petals in a radial arrange- ment (Fig. 3). Petals are free, obovate, and yellowish white (RHS N155B) with strong yellowish pink striping in the throats (RHS 43D) that may darken in color with age. Flowers are pedicellate with pistillate forms often the last to open. Staminate flowers have petals that are basally adnate to outermost stamens, which are arranged in two whorls consisting of eight to 12 stamens. The outer stamens are free except for the base and the inner stamens, which may be united into a column. Pollen is bright yellow and sticky but filaments are typically the same color as striping on the petals but slightly darker (RHS 43C). Staminate flowers fall from the tree intact as they age and pollen dehisces, leaving a carpet of blooms beneath the tree. Pistillate flowers have three to five ovaries Fig. 4. Unopened pistillate flowers were bagged on with one ovule per ovary. Ovary and style are ‘Anna Bella’ to prevent insect pollination and strong yellowish green color (RHS 144A). then hand-pollinated with fresh pollen from Fig. 6. Growth habit is upright and symmetrical. ‘Isabel’ and ‘Folsom’. In rare cases, fruits began Buds grafted onto wild rootstock take one year Once pollinated, pistillate flowers drop their to develop, swelling to 2.5 cm in diameter. to produce and are expected to grow more than petals. On a normal tung tree such as ‘Isabel’, These fruits aborted development, turned yel- 3.0 m tall after four years. Full flowering on all ovaries swell and fruits develop into large low, and eventually dried as hollow shells that terminal branches is expected on four-year-old (8.0 cm diameter) tung nuts that ripen and fell off the tree. trees with increasing density as trees mature. drop to the ground in late September. Fig. 5. Pollen grain size distributions between ‘Isabel’ and ‘Anna Bella’ measured in micrometers. 124 HORTSCIENCE VOL. 48(1) JANUARY 2013.
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