Angraecum melanostictum

Names and Taxonomy

Angraecum melanostictum Schltr. is the accepted scientific name for this species in Plants of the World Online [1]. The name was first published in Repertorium Specierum Novarum Regni Vegetabilis 15: 338 (1918) [1]. POWO places it in Orchidaceae, genus Angraecum, and records one homotypic synonym, Pseudojumellea melanosticta (Schltr.) Szlach., Mytnik & Grochocka, published in Biodiversity Research and Conservation 29: 21 (2013) [1]. The IOSPE entry also lists the species under section Pseudojumellea and gives the English common name ‘Black Spotted Angraecum,’ said to refer to spots on the sheaths [2]. Common names are not standardized, and no subspecies or varieties are documented in the supplied sources. The accepted-name decision here follows POWO; the synonym is a taxonomic placement, not a separate species.

How to Identify This Species

POWO describes A. melanostictum as an epiphytic subshrub [1]. The IOSPE account describes it as a miniature to small epiphyte with an erect, slightly compressed stem and rugose sheaths marked with black spots [2]. The leaves are described as many, linear-ligulate, and unequally and obtusely bilobed at the apex [2]. The inflorescence is axillary and short: the peduncle is reported up to about 3 cm long, with two to three sheaths, and bears a single flower subtended by oval, obtuse floral bracts [2]. IOSPE gives the flower size as about 2 cm (0.8 in) [2]. NativePlants.info lists the bloom colors as white and green and gives a plant height of up to 30 cm [3]. That height should be treated as a horticultural source value because it is not confirmed in the POWO excerpt.

Useful diagnostic features include the black-spotted sheaths, linear-ligulate leaves, and small, single-flowered axillary inflorescence [2]. These characters are more informative than flower color alone, since white and green flowers occur in many angraecoid orchids. A label or photograph that shows only the flower, without the stem, sheath spotting, leaf shape, and inflorescence structure, may not be sufficient for confident identification. No formal look-alike comparison was supplied in the available evidence, so no single visual feature should be treated as a guarantee of identity. The original protologue and a full taxonomic description were not supplied, so the range of morphological variation in this species is Not documented here.

Native Range and Habitat

POWO records A. melanostictum as native to eastern and southeastern Madagascar [1]. It is described there as an epiphytic subshrub growing primarily in the wet tropical biome [1]. The same source does not, in the supplied excerpt, give an elevation range, host-tree preferences, or detailed habitat structure. Those points are therefore Not documented in the available sources. The species is not recorded as introduced outside Madagascar in the supplied evidence. Cultivated plants are not part of the native distribution, and a nursery label does not establish a wild locality.

The wet tropical biome label is broad. It does not specify forest type, elevation, or whether plants occur on particular host trees, and those details remain Not documented. The evidence also does not describe seasonality in the wild beyond the flowering period reported by horticultural sources. Native range and habitat should not be converted directly into cultivation setpoints; the species is documented as epiphytic in a wet tropical biome, but no greenhouse temperature, humidity, or light values are supplied.

Species-Specific Care

The available evidence does not contain a species-specific cultivation protocol for A. melanostictum. The table below separates what is documented from what is missing. It does not convert the native wet-tropical distribution into greenhouse setpoints, and it does not apply care advice from other Angraecum species.

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The only species-level cultural context in the supplied sources is its epiphytic habit and its reported flowering period [1][2][3]. Because temperature, light, watering, humidity, and potting data are absent, growers should treat any general Angraecum schedule as a starting hypothesis to be checked against the plant, not as verified guidance for this species. No claim is made here that a particular rest period, humidity target, or fertilizer regime will induce flowering.

The documented epiphytic habit indicates that root-zone aeration and an appropriate mount or open medium are plausible considerations, but no source supplied here tests or recommends a specific method for this species. The medium drought tolerance listed by NativePlants.info is a plant trait, not a prescription to keep the plant dry for a set number of days [3]. Growers who maintain this species should record temperature, light, watering, and root conditions alongside flowering dates; those observations would be more useful than repeating generic angraecoid advice.

Flowering and Pollination

IOSPE reports that A. melanostictum blooms in late summer and early fall on a short, axillary, single-flowered inflorescence [2]. NativePlants.info lists bloom months as June, July, August, and September and lists the bloom colors as white and green [3]. Neither excerpt states the hemisphere or the cultivation location behind those month lists, so the reported calendar window should be treated as approximate and checked under local conditions. Flower size is given as about 2 cm (0.8 in) by IOSPE [2]. NativePlants.info lists the species as fragrant, but the supplied evidence does not describe fragrance timing, intensity, or which floral parts produce scent [3]. Flower longevity is Not documented in the available sources.

No pollinator, pollination mechanism, or breeding-system study for A. melanostictum was supplied. The single-flowered inflorescence is a morphological feature, but it does not by itself identify a pollinator. No spur measurement or pollinator observation was supplied. Pollination for this species should therefore be recorded as Not documented rather than inferred from other Malagasy Angraecum species.

Conservation and Responsible Cultivation

An IUCN Red List assessment for A. melanostictum was published in 2020 by Verlynde, Rajaovelona, Andriamahefarivo, Ramandimbisoa, Stévart, and Droissart [4]. The supplied excerpt does not state the assessment category, so no formal conservation status is assigned in this profile. No national legal status, trade restriction, or species-specific sustainable-collection guidance was supplied. The existence of an IUCN assessment does not by itself establish a category; the category must be read from the assessment itself, which was not available in the excerpt. A nursery purchase should not be assumed to be legally compliant without evidence from the vendor and relevant authorities.

Evidence and Limitations

This profile is based on search snippets, not full-page or full-paper verification. The accepted name and native range follow POWO [1]. Morphology and flowering details rely on the IOSPE species entry [2] and NativePlants.info [3], both secondary horticultural compilations in this context; they are useful but are not equivalent to an original description or a revised flora. The IUCN assessment is known from its title and publication date, but its category is not visible in the supplied excerpt [4]. Material gaps include elevation, host-tree ecology, flower longevity, fragrance timing, pollinator identity, and species-specific temperature, light, watering, humidity, potting, and feeding protocols. No verified photograph, herbarium specimen, or full taxonomic description was supplied. This draft should not be described as botanically reviewed or publication-ready.