Ziziphus angustifolia
| Ziziphus angustifolia | |
|---|---|
| Scientific name | Ziziphus angustifolia |
| Genus | Ziziphus |
| Family | Rhamnaceae[1] |
| Order | Rosales[1] |
| Native range | Southern Indo-China to Papuasia[1] |
| Habitat | Primary and secondary forest, including Borneo rainforest from lowland sites to about 1500 m[2][3] |
| Mature size | Unarmed tree recorded to about 25–30 m[2][3] |
| Fruit | Glabrous obovoid drupe, yellowish-green, pinkish or red; about 1.3–1.9 cm long[1][2] |
Ziziphus angustifolia is an unarmed Southeast Asian and western Pacific forest tree in the family Rhamnaceae. Its native range extends from southern Indo-China to Papuasia, and its documented habitat includes primary and secondary forest. The species is accepted under this name by Kew; Ziziphus inermis, Ziziphus forbesii, and Ziziphus grewioides are recorded synonyms in the PROSEA treatment.[1][3]
Description[edit | edit source]
The Borneo revision describes Z. angustifolia as an unarmed rainforest tree reaching about 25 m. It is distinguished in that treatment by large triplinerved leaves, cymes that can appear nearly fascicle-like, and flowers with 2–4 style arms.[2] PROSEA gives a broader small-to-medium tree estimate of up to about 30 m and places the species in primary and secondary forest up to 600 m; the differing figures reflect the geographic and source scope rather than a reliable garden-size limit.[3]
The fruit is a glabrous obovoid drupe. Kew's description records yellowish-green, pinkish, or red fruit, with measurements centered around 1.6 cm long and 1.1 cm wide and observed ranges of approximately 1.3–1.9 by 0.8–1.5 cm; the Borneo revision also records fruits ripening through those color stages.[1][2]
Cultivation[edit | edit source]
Soil and water[edit | edit source]
In its native records, Z. angustifolia grows in primary or secondary forest, including Borneo rainforest sites from sea level to about 1500 m in the revision and to 600 m in the PROSEA species account.[2][3] As a member of Ziziphus, a reasonable genus-level starting point is a deep, well-drained medium with enough organic matter to avoid rapid drying while never leaving container roots stagnant; confirm that response for this species before treating it as a fixed requirement.[4]
Sun and humidity[edit | edit source]
The species is documented from forest rather than from an open commercial orchard, and the Borneo material spans lowland to montane rainforest settings.[2] Begin with bright filtered light, good airflow, and reliable moisture while a plant is being established; this is a cautious habitat-based inference, not a tested shade percentage or a demonstrated tolerance limit. The genus account describes Ziziphus as occurring generally at low elevations in primary and secondary forest, but that genus pattern should not be used to set a species hardiness boundary.[4]
Seasonal changes[edit | edit source]
Kew's Borneo-backed collection record lists flowering collections from June through November and fruit collections in every month of the year.[1] These are collection-phenology records, not a universal garden calendar. In cultivation, keep the root zone from cycling abruptly between saturated and dry conditions during the local warm/wet and cool/drier seasons, and record flowering and ripening locally rather than assuming that the collection months predict a fixed harvest window.
Propagation[edit | edit source]
The PROSEA genus account identifies seed and transplanted root suckers as propagation routes in its summarized silvicultural evidence, while reporting that cuttings failed in that genus-level context.[4] For Z. angustifolia, this supports seed or carefully handled suckers as reasonable methods to investigate, not a validated species protocol. Collect seed from a known plant, keep provenance with it, and test a small batch before scaling up. The genus account's grafting discussion concerns Z. mauritiana cultivars and is not evidence for grafting this species.[4]
Flowering, fruiting, and harvest[edit | edit source]
The genus account describes bisexual, protandrous flowers with nectar and fragrance that attract insects; the Borneo revision records 2–4 style arms for Z. angustifolia.[2][4] Treat pollination compatibility, bearing age, yield, and a fixed garden flowering schedule as conditional on the individual plant and growing site.
Kew lists flowering collections from June–November and fruit collections from January–December in its Borneo-backed record.[1] Where a tree fruits, use the observed color change from yellowish-green toward pinkish or red as a harvest cue, while recognizing that the source describes collected specimens rather than a tested maturity index. Handle fruit by the individual tree's observed stage.
Fruit and uses[edit | edit source]
The documented fruit is small, obovoid, and glabrous, with yellowish-green, pinkish, or red forms or ripening stages recorded in the botanical treatments.[1][2] Kew records the fruits as edible from named collector records. That record supports a documented edible-fruit observation, not a food-safety assessment, preparation guidance, or claim about flavor, texture, flesh-to-seed ratio, or storage.
The PROSEA species account also records a Papua New Guinea cultural use of scraped root bark with betel nut and lime. This is ethnobotanical context only; it is not a medicinal instruction, contraceptive recommendation, or safety evidence.[3]