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Network Scan Data Selbyana 28(2): 150-153. 2007. RARE NATURALIZATION OF AN ORNAMENTAL TILLANDSIA, TILLANDSIA IONANTHA IN SOUTHERN FLORIDA ROBERT PEMBERTON* AND Invasive Plant Research Laboratory, USDA, Agricultural Research Service, 3225 College Ave., Ft. Lauderdale, FL 33314, USA. Email: [email protected] HONG Lm University of Florida, Ft. Lauderdale Research and Education Center, 3205 College Ave. Ft. Lauderdale, FL 33314, USA. ABSTRACT. Reported here is the naturalization of a Mesoamerican bromeliad.' Tillandsia ionantha, in Broward County, southeast Florida. This species is a popular ornamental bromehad. A total of 63 clusters of plants were found on 31 Australian pine trees adjacent to a mangrove forest at Anne Koeb Nature ~ent~r in Dania Beach, Florida. The presence of flowers and germinating seeds indicate that the populatJ.o~ IS reproducing sexually. No pollination agent(s) is known for this pollinator-dependent species at this locatIOn. This is only the second reported case of naturalization of Tillandsia world-wide. Key words: Bromeliaceae, exotic species, Florida, naturalization, Tillandsia ionantha DISCUSSION guncularia racemosa (L.) C.RGaertn., and Rhi­ zophora mangle L.). This forest occurs within A small population of the Mesoamerican bro­ 10 meters down slope from the Australian pine meliad Tillandsia ionantha Planchon has been trees colonized by T. ionantha. Searches along found in Broward County in southeastern Flor­ the edges of the mangrove forest and inside ida. Rosette clusters and seedlings of plants of mangrove accessed by boardwalks failed to find T. ionantha are growing on the trunks of Aus­ additional T. ionantha plants in the park. Search­ tralian pine trees (Casuarina esquisetifolia L.) at es in other stands of Australian pine and other Anne Koeb Nature Center in Dania Beach, ad­ native plant or horticultural plantings in the park jacent to Hollywood, Florida at 26°02'32''N and also failed to locate other T. ionantha. Discus­ 800 07'09''W (FIGURE 1). The plants occur in sions with park personnel responsible for horti­ clusters of 3 to 51 rosettes, with a median of 8 cultural plantings indicated that no Tillandsia rosettes. Sixty-three clusters of plants were species have been planted in the park. found on trunks of 31 trees in an area of 40 m 2• Tillandsia ionantha is native to Mexico from These clusters of plants are from 0.4 to 3.5 m Sinaloa in the northwest south to Costa Rica above the ground with a median height of 1.27 (Bailey & Bailey 1976, H. Luther pers. comm.). m on the Australian pine trees. The sizes of the It is and has been grown on a commercial scale host trees range from 2 to 13 cm, with a median and is one of the more commonly available bro­ of 4.5 cm in dbh (diameter at breast height at meliads. It is often one of the first bromeliads 1.4 m height). The plants are growing on both acquired by novice growers because of its small living and dead trees, but the majority (81.6%) size, hardiness, and ease of cultivation (Staples of the host trees are living. Eleven (17.5%) clus­ & Herbst 2005). Tillandsia International, a ters consist of only juvenile plants «2 cm ro­ wholesale nursery based in Coarsegold, Califor­ sette width), while the other 52 clusters of plants nia, lists 16 named cultivars and varieties and 4 are presumably of reproductive size. Seedlings hybrids of T. ionantha, more than any other spe­ were also noted on 13 trees, but more intensive cies in its extensive sales list (www.airplant. search would almost certainly reveal more seed­ com). It is commonly sold in Florida, and has lings. Nine rosette clusters (13.2%) were either been grown commercially within the same coun­ in flower and/or had seedlings with associated ty where the naturalized population occurs. The seed filaments still attached during our May 19, now defunct Salter family nursery, which oper­ 2007 assessment of the population. The natural ated in Plantation in Broward County, special­ vegetation at Anne Koeb Nature Center and the ized in T. ionantha and produced them in very adjacent West Lake Park is comprised mostly of large numbers (H. Luther, D. McLean pers. mangrove forest (Conocarpus erectus L., La- comm.). The plants grow in dense clusters of rosettes, * Corresponding author. probably by the production of offsets. Individual 150 PEMHBRTON & LIU: ORNAMENTAL BROMELIAD NATURALIZATION 151 FIGURE 1. Tillandsia ionantha plants growing on Australian pine trees (Causurina equistifolia) in a natural­ ized population of this escaped ornamental bromeliad in Dania Beach in southeast Florida. rosettes are vase-shaped, taller than wide, and recently reported to have escaped cultivation and 5-10 cm high. Plants have stiff, erect, narrowly naturalized on the island of Maui in Hawaii (Op­ triangular leaves with a long-tapering apex. The penheimer 2006). The requirement for pollina­ leaves are green with scattered or dense ash grey tion in most Tillandsia species (inferred by scales, except during flowering, when the inner Benzing et al. 2000) and the absence of suitable leaves are pink to red. The flowers are tubular, pollinators' probably accounts for the rarity of blue with a white base, have exserted stamens naturalization of Tillandsia species. The Tilland­ and style, arise from the rosette center, and ex­ sia native to Florida are mostly autogamous tend just beyond the rosette tips. The pink to red (Benzing et al. 2000). Autogamy in these out­ leaves in the center of the grey-green rosettes lying populations of neotropical Tillandsia may gives this species a distinctive appearance, reflect depauperate faunas (of pollinators) and! which has led to its horticulture common, name or founder effects by autogamous colonizers "blushing-bride." The dense clusters of small (Benzing et al. 2000). Autogamy also occurs in rosettes with red coloration in flowering plants some native Florida orchids of tropical Ameri­ readily separates it from Florida's 12 native Til­ can origin, whose seed blew to Florida, leaving landsia species (Wunderlin & Hansen 2003), the plants' pollinators behind (van der Pijl & some of which are common in the southeastern Dodson 1966). part of the state. Voucher specimens of the nat­ Genetic studies have shown T. ionantha to be uralized T. ionantha plants are deposited in her­ an outcrossing species (Soltis et al. 1987), and baria of the Fairchild Tropical Botanical Garden plants kept in a greenhouse isolated from polli­ in Miami, Florida and the University of South nators do not produce fruit (D. Benzing pers. Florida, Tampa, Florida. comm.). As indicated earlier, some of the plants Although Tillandsia species are popular hor­ bore flowers in March to May 2007, when the ticultural subjects in the tropics and subtropics, population was found and evaluated. Clusters of few have naturalized worldwide. The only report germinating seedlings enmeshed in the seed fil­ found is that of T. caput-medusae C.J.Morren, aments were found atop and within the rosettes 152 SELBYANA Volume 28(2) 2007 FIGURE 2. Seedlings of Tillandsia ionantha enmeshed in the seed filaments attached to the rosette which bore the fruit generating the seed. This seed production indicates that sexual reproduction in this obligate, outcrossing species is occurring in the naturalized population. of some plants (FIGURE 2), indicating that sexual cally diverse native range, which suggests broad reproduction is occurring in the population. We environmental tolerance within tropical climate observed pollen on the stigma of a flower at the areas. It is intolerant of freezing temperature, site, compared it to pollen from the anthers of which will probably limit it to southern Florida the flower, and determined that it was conspe­ and central Florida along the coasts. Selby Bo­ cific pollen. The agent(s) responsible for T. ion­ tanical Gardens in Sarasota had outdoor planting antha's pollination and subsequent fruit produc­ of T. ionantha that included large clumps of tion in southern Florida have yet to be deter­ plants, all of which were killed during the 1989 mined. Most Tillandsia subg. Tillandsia, to freeze when the low temperature reached which T. ionantha belongs, are thought to be -4.4°C (R. Luther pers. comm.). Coastal south­ pollinated mostly by hummingbirds, and to less­ eastern Florida, where the naturalization has oc­ er extent by bees and Lepidoptera (Benzing et curred, experiences fewer freeze events than al. 2000), but the pollination ecology of most does Sarasota, but both native and ornamental species is unknown (R. Luther pers. comm.). plants were also seriously affected by the same Tillandsia ionantha's red inner leaves, which ap­ 1989 freeze when the temperature dropped to pear at flowering, and its exserted flower parts -1.1°C in Ft. Lauderdale (www.weather.gov). suggest hummingbird pollination (Benzing et al. Weather records have been kept for Ft. Lauder­ 2000). Although hummingbirds occur in south­ dale since 1912 and temperatures below - 1.1 °c ern Florida, they are not reliable pollinators. have occurred on five occasions: -1.7°C in 1985 This has led to autogamy in the red-flowered and 1934, -2.2°C in 1917 and 1977, and -5°C terrestrial orchid Sacoila lanceolata (Aublet) in 1943 (www.weather.gov).This suggests that Garay, which is hummingbird-pollinated in trop­ long-term survival of naturalized tropical plants ical America (Catling 1987). Pollination success such as T. ionantha may be limited by relatively is probably among the most important factors rare freeze events. Although global warming ap­ for T. ionantha's expansion. pears to be increasing Florida temperatures, it It is difficult to predict what the potential geo­ seems unlikely to eliminate rare freeze events. graphic range of T. ionantha will be in Florida, Australian pine, the host tree for the naturalized based on its currently known limited occurrence T.
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