Eugenia patrisii
| Ubaia (Eugenia patrisii) | |
|---|---|
| Scientific name | Eugenia patrisii |
| Genus | Eugenia |
| Family | Myrtaceae |
| Order | Myrtales |
| Native range | Tropical South America |
| Growth habit | Shrub or small tree |
| Fruit | Globose; red when ripe in a grower account |
Eugenia patrisii is a shrub or tree of wet tropical South America, accepted under that name by Kew. Its range includes Bolivia, northern and northeastern Brazil, Colombia, Ecuador, the Guianas, Peru, Suriname and Venezuela. The plant is also associated regionally with the names Ubaia, araçarana and fruta-de-jaboti. [1] The common name Ubaia is useful as a search name, but nursery use of that name has been associated with identification confusion; the accepted scientific name is the safer label for a plant record.
A taxonomic treatment describes trees 2.5–8 m tall, elliptic to ovate leaves, axillary racemes and globose immature fruits about 2 cm across with conspicuous surface glands. Its Amazonian Maranhão records include flooded forest, flowering in September and fruiting in November and December. [2] The species remains an early domestication subject rather than a standardized orchard crop. Two recent experiments compared plants and fruits from an agronomic planting in Marabá, Pará, and found useful variation among experimental phenotypes. [3][4]
Description[edit | edit source]
The botanical material is variable in size and fruit form, and the cultivation work has focused on plants already growing in an agronomic experiment rather than on a uniform released selection. Seven experimental phenotypes were compared in the germination study. A later fruit and seed study selected Ph2, Ph3 and Ph6 for contrasting analyses; these labels describe research material, not formal cultivars or nursery-proven selections. [3][4]
The taxonomic treatment records leaves 6.2–14.4 cm long and 3.1–6 cm wide, axillary racemes and young globose fruit. [2] A specialist horticultural account describes a small, bushy evergreen tree and red fruit, while an attributed grower account describes ripe fruit as bright red, crisp and interesting. Those sensory descriptions are observations tied to particular plants, not a fixed description for every population. [6][7]
Cultivation[edit | edit source]
Soil and water[edit | edit source]
Wild records place Eugenia patrisii in wet tropical conditions, including flooded forest in Amazonian Maranhão. [1][2] A cautious habitat-based starting point is a moisture-retentive soil with reliable drainage: keep the root zone from drying hard, but do not assume that permanent saturation around a container root ball is safe. This is a cultivation inference from the habitat, not a measured species requirement.
A grower in Puerto Vallarta described seedlings as disliking transplanting and excessive water. That individual observation supports careful handling and conservative irrigation during establishment, but it does not define a universal water tolerance. [6] In a container, use a porous mix and avoid repeatedly disturbing the root ball.
Sun and humidity[edit | edit source]
The native range and wet-tropical habitat indicate a warm, humid growing context. [1] An attributed Carangola grower kept two nursery plants under about 70% shade for two additional years, with twice-daily watering and manure, before planting them out. This is useful context for cautious nursery establishment, not evidence that the species requires permanent shade. [6]
For a first growing trial, provide bright filtered light while a seedling establishes, then increase exposure gradually if the plant maintains good leaf condition. Protect the root zone from waterlogging and provide airflow in humid weather. These practical starting points should be adjusted to the plant's response and local climate.
Seasonal changes[edit | edit source]
The Amazonian Maranhão treatment records flowering in September and fruiting in November and December. [2] A separate horticultural account gives August–September flowering and October–November ripening, so the calendar should be treated as regional rather than fixed. [7] In the forum account, a tree planted in 2011 was said to fruit from 2013 and to carry light crops in March and September during 2013–2015; later updates described heavier fruiting. This is one grower's outcome under a particular climate and cannot set a general bearing age or season. [6]
In cultivation, adjust irrigation to the plant's seasonal growth and local rainfall rather than copying a calendar from another region. Keep young plants evenly supplied during active growth, and monitor containers closely during hot dry periods.
Propagation[edit | edit source]
Seed is the best documented propagation route for this species. In a Marabá experiment, germination was hypogeal and cryptocotyledonary, with seven described stages. The seeds were followed from radicle protrusion through seedling development, and the reported mean germination time across the compared phenotypes ranged from 13.4 ± 1.8 to 17.8 ± 0.3 days. [3]
A separate experiment used seeds from selected phenotypes in fine sterilized sand at 35 ± 2 °C, with irrigation every 48 hours or when the substrate dried and a 12-hour light/12-hour dark cycle. In that study, germination was counted when the radicle reached 2–5 mm. These are controlled greenhouse conditions for the Marabá material, not a guaranteed home-germination recipe for every seed lot. [4]
The germination comparison found Pht2 at 100% and Pht7 at 12.5 ± 7.7% in the reported phenotype results, while Pht3 was identified as the most promising phenotype for domestication and cultivation, followed by Pht2 and Pht6. The later study likewise framed Ph3, and in some analyses Ph6, as promising research material. None of these phenotype labels is a named cultivar. [3][4]
Sow fresh, fully developed seed promptly when possible and minimize root disturbance after emergence. The handling caution is consistent with the attributed transplant observation; storage duration, vegetative propagation, grafting and rooting of cuttings are not covered by the species-specific experiments. [6]
Flowering, fruiting, and harvest[edit | edit source]
Flowering and fruiting dates vary among the available regional accounts. The Maranhão treatment records September flowering and November–December fruiting. [2] A commercial account gives August–September flowering and October–November ripening, and a grower in Carangola described fruiting in March and September in several years. [7][6] These records suggest that local climate and plant provenance matter more than a single universal harvest calendar.
The same grower described some fruit dropping before ripening in the early crops, followed by later production of many fruits and jelly. Ripe fruit was described as bright red. Pick fruit only after the individual fruit has reached its mature color and separates readily, using local observations to refine the harvest point. [6]
The species-specific experiments demonstrate variation in fruit and seed traits among plants from one agronomic population. They do not establish a standard bearing age, yield, pollination requirement or orchard pruning system. [3][4]
Fruit and uses[edit | edit source]
Regional descriptions associate the fruit with fresh eating and preparation as refreshments, juices and sweets. [5] A specialist nursery account adds preserves and desserts, while the Carangola grower described jelly made from later crops. These processing uses are practical attributed descriptions rather than a universal flavor or texture standard. [7][6]
The 2026 fruit-composition study measured pulp from three selected research phenotypes. Reported ranges were 76.6–79.3 g carbohydrate, 12.7–17.5 g protein and 2.8–4.1 g lipid per 100 g in the study's analyses. These values describe the sampled Marabá material and should not be treated as a fixed nutritional profile for all E. patrisii fruit. [4]
The species is a promising fruit-domestication subject. Use fruit identity and provenance carefully when adding a plant to a collection, especially where Ubaia is used as a common name for more than one plant.
References[edit | edit source]
- ↑ [3] Morphoanatomical and physiological indicators revealed distinct intraspecific phenotypes of Eugenia patrisii (Myrtaceae) during germination and post-germination.
- ↑ [4] Fruit Nutritional Composition and Seed Reserve Mobilization as Tools for Phenotypic Selection in Eugenia patrisii (Myrtaceae).