Gen info
- Prunus grisea is a species of plant in the family Rosaceae.
- It was published and described in 1965 by Cornelis Kalkman in "Blumea" Vol 13.

Botany
Prunus grisea is a tree or shrub. Twigs pubescent to puberulous, rapidly glabrescent. Leaves usually elliptic to oblong, sometimes ovate to lanceolate, 2-20 by 1-9 cm, index 1 1/2-3 1/2, base rounded or acute, apex usually acuminate, sometimes (in var. microphylla and in New Guinea specimens of far. grisea) obtuse, sparsely pubescent to glabrous on both sides; nerves (4-) 5-9 (-11) pairs, flat to impressed above, prominent to prominulous beneath, venation inconspicuous to invisible; basal glands 2 (0-4), flat, additional glands usually present; petiole 1/4-1 1/2 (-2) cm, pubescent to puberulous, more or less glabrescent. Stipules 1 1/2-8 by 1/4-1 3/4 mm, index 2-8 (-12), pubescent to glabrous outside, usually glabrous inside, margin usually glandular (in Philippine specimens of var. grisea sometimes distinctly glandular-serrate). Racemes solitary, in axils of extant or fallen leaves, 1/2-6 1/2 cm; peduncle 0-1 cm; rachis (sparsely) pubescent. Bracts up to 2 1/2 mm, usually caducous, the basal ones often with tridentate apex, in Philippine specimens of var. grisea the bracts sometimes large, up to 9 mm long. Pedicels 0-7 mm, (sparsely) pubescent. Hypanthium 1 12-4 mm high, pubescent outside, sometimes only sparsely so, entirely glabrous inside or with hairs on bottom. Perianth segments 6-13, subequal, or more or less distinctly differentiated as sepals and petals, 1/2-2 mm long. Stamens 15-50; filaments up to 6 mm, glabrous; anthers 1/4-3/4 mm long, in var. microphylla rarely longer. Ovary usually glabrous, but sometimes with some hairs, rarely (Java specimens of var. grisea especially) distinctly hairy; style up to 7 mm. Fruits globular to transversely ellipsoid, 6-13 by 7-16 mm, sometimes distinctly or indistinctly pointed (var. tomentosa), glabrous or almost so; endocarp glabrous or sparsely hairy; seedcoat glabrous.  (Kalkman, 1965; pp. 56-57). (2)

Distribution

Properties
Studies have suggest antioxidant and
cytotoxic properties.

Parts used
Bark, leaves.

Uses
Folkloric
- Bark used for skin irritation.
- Leaves used for rheumatism.
Others
- Wood: Used for indoor construction, furniture, plywood, packing cases.

Studies
• Antioxidant / Toxicity Study / Leaves: Study evaluated leaf decoction and various extracts of P. grisea for antioxidant properties using DPPH and toxicity using brine shrimp lethality assay. The chloroform extract showed highest toxicity to the brine shrimp Artemia salina with LC50 of <10 ppm. Decoction of leaves showed most potent antioxidant properties, with percent antiradical activity of 92.85% at 500 ppm, total antioxidant capacity of 110.42 Ascorbic Acid Equivalents (AAE) and 147.14 Butylated Hydroxytolene Equivalents (BHTE) and total phenolics content of 319.00 Gallic Acid Equivalents (GAE). (3)
• Bioactivity against Brine Shrimp Artemia Salina / Air-Dried Leaves: Study focused on a bioassay-guided partial isolation of bioactive fractions from the hexane extract of air-dried leaves of Prunus grisea. Gravity column chromatography isolated 14 fractions PCH1-PGH14. PGH13 exhibited the highest bioactivity against brine ship Artemia salina with mortality of 56.67%. (4)

Availability
Wild-crafted.

Additional Sources and Suggested Readings
(1)
Prunus grisea / Plants of the World Online
(2)
Prunus grisea / PIER: Pacific Island Ecosystems at Risk
(3)
Toxicity and antioxidant properties of the extracts of Prunus grisea (C.Muell.) Kalkm leaves / Mylene M Uy, Princess T Pundogar / Asian Journal of Biologivcal and Life Sciences, 2015; 4(2): pp 81-86
(4)
Bioassay-guided fractionation and chromatographic profiling of the hexane extract from the leaves of "tanga-tanga", Prunus grisea / Charmaine G Torres, Mylene M Uy / Asian Pacific Journal of Science, Mathematics and Engineering, 2014; 2(1): pp 17-20

DOI: It is not uncommon for links on studies/sources to change. Copying and pasting the information on the search window or using the DOI (if available) will often redirect to the new link page. (Citing and Using a (DOI) Digital Object Identifier)