Description, habitat and geographic distribution of the genus Jaltomata (Solanaceae) |
revised 2024 |
Link to Jaltomata homepage |
The information on this page may be cited as a communication with professor Thomas Mione, Central Connecticut State University, Biology Department, Copernicus Hall, 1615 Stanley Street, New Britain, Connecticut 06050-4010, United States of America. |
Jaltomata is a diverse solanaceous genus of approximately 70 species. Habitats range from full sun in the desert (Mione, Leiva & Yacher 2014) to shaded trail edges in rain forest (Mione, field work). J. viridiflora has been collected in "dense rain-forest" (Galen Smith 1079, US) and "suparamo" (Plowman & E. W. Davis 3749, K). Species of this genus naturally grow at altitudes from near sea level to over 4,100 m, and are distributed from Arizona, USA to Boliva and on the Galápagos and the Greater Antilles. Berries of at least 45 species are eaten by people (Mione, unpublished data), are fleshy, and orange, red, purple/black or green at maturity. Flowers range from rotate to tubular, from under one cm to six cm across, and flowers per inflorescence range from 1–41. Hummingbirds and bees have been seen visiting the flowers of a few species, and among various species the nectar color ranges from transparent to blood-red (Mione & Anderson 1996, Hansen et al. 2007). In this genus both widespread species and narrow endemics are known: for example J. repandidentata (Dunal) Hunz. grows from Mexico to Bolivia (Mione & Yacher 2005) but J. atiquipa Mione & S. Leiva is known only from the coast of Peru near the top of one small mountain receiving all of its moisture from fog (Mione et al. 2011). This genus is of interest for studies of ethnobotany (Davis & Bye 1982, Williams 1990), floral biology and colored nectar (Mione et al., 2001, Hansen et al. 2007), seed germination (Saldívar-Iglesias et al. 2010), biogeography (Dillon 2005), phylogeny (Mione et al. 1994, Miller et al. 2011), taxonomy (Mione, Anderson & Nee 1993, Mione, Leiva & Yacher 2007, 2014, Leiva et al. 2010, Leiva, Mione & Yacher 2013), ecological genomics (Haak et al., 2014), and the genetic basis of morphological evolution (Mione & Anderson 2017). |
Description of Jaltomata (Solanaceae): A diverse neotropical genus
Footnotes for the above: 1) The annular disk around the ovary (ovarian disk, the expanded base of the ovary) has been described as a nectary disk ("disco nectarífero" Benítez de Rojas 2010). Similar Genera Jaltomata differs from Physalis by the former having a fruiting calyx that does not enclose the berry, while the fruiting calyx of Physalis encloses the berry. Jaltomata differs from Solanum by the former producing nectar and having longitudinal anther dehiscence, while Solanum has anthers with terminal pores and does not produce floral nectar. |
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Habitat: I have collected Jaltomata species most commonly along roadsides where the native vegetation is still present to some extent. If the native vegetation has been entirely eliminated for agriculture I usually can't find Jaltomata. In other words, most species are tolerant of a considerable amount of open sun, but not completely open sun. However, J. nigricolor and J. salpoensis are found in completely open sun, with no shade whatsoever. In the Andes, rock walls (J. sanchez-vegae) and steep roadside embankments are common habitats of Jaltomata species. The easiest way to find J. repandidentata is in coffee plantations that have not been weeded (Mexico to Bolivia), the coffee plants providing considerable shade. Even in the forest, when I have found Jaltomata it was along a trail or gravel road (Costa Rica) where light was entering through the canopy at least part of the day. In Mexico, the easiest way to find J. procumbens is in corn fields that have not been weeded, the corn plants usually providing shade depending on the height of the corn. Some Jaltomata species do not stand alone, and require other plants to grown among (J. dendroidea and J. pallascana, for example); here the physical support of other plants and the shade of other plants are inseparable. One species grows, with few exceptions, in between or very near the spiny leaves of Puya. Most Jaltomata species are somewhere in the middle of the spectrum of dry to moist habitats. On the wet end of the spectrum there are ecotypes of J. procumbens that reside in the rainforest, for example in Costa Rica at high elevation, including an epiphyte at Monteverde. As well, J. werffii grows on wet slopes (Galápagos Islands). On the dry end of the spectrum are the species that reside in the lomas. And J. calliantha (red/orange nectar and green fruits) dies back to the ground for several months of the year; its habitat is seasonally quite dry. One of the lomas species has deciduous leaves, and it may receive no rainfall for months, and then when the fog returns, approximately in August, the leaves emerge again. |
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Geographic Distribution: The approximately 60 species of Jaltomata are distributed from southeastern Arizona, USA (Kearney and Peebles, 1951) to southern Bolivia (Morton, 1944), on three of the Galápagos Islands (D'Arcy, 1982), and on the Greater Antilles (Cuba, Jamaica, Haiti, Dominican Republic, Puerto Rico; Adams, 1972; Davis and Bye, 1982; Liogier and Martorell, 1982). The majority of the species are Andean but one of the most common species, J. repandidentata, extends throughout much of the continental range of the genus, from Mexico to Bolivia (Mione and Yacher, 2005). The USDA Plants Profile (web site) for Jaltomata procumbens shows this species in Maryland, U.S.A. I have not seen collection(s) made from plants growing in Maryland. Highest Collection: J. yungayensis at 4,150 m of elevation (J. Mostacero L, S. Leiva G. et al. 1897). In the department of Cajamarca, Peru, there are over 20 distinct and defendable species! Link to Jaltomata of Arizona, Mexico and Central America In Connecticut, USA, where I have grown outdoor plants of J. procumbens, seeds in fruits dropped to the ground in the fall have germinated during the following spring, becoming weeds in the garden where they were grown the year before. This suggests that the northern end of the range of this genus is limited by dispersal and / or successful establishement among competitors, not by sensitivity to cold. |
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Figure 1. Inflorescences are normally umbel-like in the genus Jaltomata (J. procumbens, photo by T. Mione) |
Figure 2. A few species of the genus Jaltomata have branched-umbel-like inflorescences (J. bernardelloana photo by T. Mione in Peru). |
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Figure 3. Ripe fruits of the genus Jaltomata. Fruits of J. grandiflora are often light purple at maturity even though the fruit photographed is brown-purple, and drop at maturity without the calyx. Fruits of J. quipuscoae are green at maturity, as shown, and drop at maturity. Fruits of J. weigendiana are orange at maturity, as shown, and remain firmly attached to the parent plant at maturity. Units across bottom are mm. |