Prockia crucis, generally known as guasimilla,[3] is a species of flowering plant in the family Salicaceae, distributed across the Americas. As the type species of its genus,[4] it was first published by Carl Linnaeus in 1759, although originally named by Patrick Browne. The plant serves a small range of purposes, being used for medicine, gardening, and food.[2][5]Prockia crucis is classified as least concern by the IUCN Red List.[1]
Prockia crucis is a variable shrub or tree usually 1.2–10m (3ft 11in– 32ft 10in) tall, occasionally reaching up to 20m (66ft). It is characterized by a globosecrown supported by a crooked trunk that is up to 25cm (9.8in) wide, with grey or brown bark that is either glabrous or puberulous ; the wood within is white, coarse, and quite brittle, reportedly having a density of 0.58 g/cm3 (0.052 oz/in3). The leaves are alternate , measuring up to 15cm (5.9in) long and 11cm (4.3in) wide; the shape is commonly elliptic, lanceolate, or ovate, the apex is acuminate, the base is often rounded or cordate, and the margins are frequently serrate or crenate. The leaf surface is either chartaceous or membranaceous, and the veins come in pairs that form an obscure reticulate pattern; the petiole is short, measuring up to 3cm (1.2in) long.
The inflorescences are usually racemose , paniculate , or corymbose , measure up to 4cm (1.6in) long and 3cm (1.2in) wide, and contain up to 12 hermaphroditic flowers that are green or yellow in color. The stamens are yellow, numerous, and feature filaments that are up to 6mm (0.24in) long. The ovary is superior , either globose or ovoid in shape, and may be glabrous or puberulous; it bears a style that measures up to 4mm (0.16in) long, tipped by a lobed stigma. The fruit is a globose berry or drupe measuring up to 10mm (0.39in) in diameter; they begin green and mature to red, purple, or black, featuring a thin pericarp and a reportedly juicy pulp. The seeds are light brown or black, smooth, striate , and small in size, measuring roughly 1.5mm (0.059in) long and 1mm (0.039in) wide.[1][2][5][6][7]
Due to its large extent, Prockia crucis inhabits a decent variety of tropical and subtropical environments, present at elevations of up to 2,500m (8,200ft). It thrives in many forest habitats, most notably those dominated by Quercus or Araucaria, as well as gallery forests, semi-evergreen forests, and tropical rainforests. In addition to forests, Prockia crucis occurs in thorny thickets, shrublands, grasslands, and floodplains. Although seen typically growing in serpentine soil, it has been recorded on limestone.[1][2][5][6]
Prockia crucis was first published by Carl Linnaeus in 1759 as the type species of its genus, although originlly named by Patrick Browne earlier.[4][8] The family that Prockia and this species were placed into was initially ambiguous, either being grouped into Flacourtiaceae under the Cronquist system or Tiliaceae under the Bentham & Hooker system. Later on, these families became defunct because of the APG IV and APG systems respectively, resulting in Prockia being classified under Salicaceae according to modern systems; despite these taxonomic changes, the tribe Prockia is within, Prockieae, has remained with the genus and has not been absent in any of its classifications.[2][9][10][11]
Etymology
The generic nameProckia is in honor of Christian Leberecht von Prøck, a Danish baron.[12] The specific epithet, crucis, is the genitive singular form of the Latin crux, which means "cross". The word crucis is used to indicate possession or relationship, therefore translating to "of the cross"; it is unclear why this epithet was chosen.[8][13]
Common names
Prockia crucis goes by several common names, especially in Portuguese; these names reportedly include cuiteleiro, guaçatunga-coração, guaiapá-manso, marmeladinha, and the most prevalent term, guasimilla.[3][7][14][15]
Uses
Prockia crucis shows notable medicinal potential through its ethanol leaf and bark extracts, which exhibit strong antioxidant activity and acetylcholinesterase inhibition, indicating relevance for Alzheimer’s treatment. HPLC analysis revealed key phenolics such as gallic acid, luteolin, kaempferol, and coumarin. Though direct antifungal effects were limited, the extracts enhanced fluconazole efficacy against resistant Candida tropicalis, highlighting their role as antifungal modulators. Outside of testing, the leaves are said to have medicinal qualities, although they are not specified.[5][16]
The exact uses of Prockia crucis in gardening are not specified, but it is capable of being sown; it is best to do so when it ripens, where it must be done in a partially shaded nursery seedbed. The seeds must be gently sown on the soil surface due to their small size; a low germination rate is typical, with sprouting occurring within 40–60 days.[5]
The fruits are dubiously edible, and are consumed for food; although its edibility is not explicitly mentioned, several species within Salicaceae produce fruits that are safe to eat, indicating that the fruits of Prockia crucis may be consumable.[2][5]
Conservation status
Prockia crucis boasts a large and stable population; it is not experiencing any known threats, and is present in many protected areas, additionally having ex-situ locations. As a result of these factors, the species is classified as least concern by the IUCN Red List.[1]
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