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Family Apocynaceae
Buyok-boyok
Heterostemma cuspidatum Decne.

Scientific names Common names
Heterostemma cuspidatum Decne. Biniguasan (Tag.)
Heterostemma manillense Schauer Buyok-boyok (Tag.)
Stapelia quadrangula Blanco Buyok-buyok (Tag.)
  San Bartolome (Tag.)
In Quisumbing's compilation, buyok-buyok is a local name shared by (1) Heterostemma cuspidatum, buyok-buyok (Tag.) (2) Ehretia microphylla, chaang-gubat, buyok-buyok (Sul.), and (3) Momordica cochinchinensis, buyok-buyok, patolang-uak (Tag.).
Heterostemma cuspidatum Decne. is an accepted name. KEW: Plants of the World Online

Botany
Buyok-boyok is a slender vine with milky juice and twigs 3 to 4 millimeters in diameter. Old stems are remarkable for their corky wings or ridges. Leaves are smooth, thin, ovate, 6.5 to 17 centimeters long, 3.5 to 10 centimeters wide, pointed at the tip and rounder or somewhat heart-shaped at the base. Flowers are purplish, hairy, about 8 millimeters across, and on slender stalks 1.5 to 2 centimeters long. Corolla segments are broadly ovate, leathery, and horizontally spreading. Follicles are in pairs, smooth, and linear, being 10 to 14 centimeters long. Seeds are flat, concave-convex, oblong, and about 1.3 centimeters long, with numerous, silky white comae.

Distribution
- Found only in the Philippines.
- In secondary forests and thickets at low altitudes in Rizal, Laguna, Cavite, and Batangas Provinces in Luzon; and in Busuanga.

Properties
Leaves considered antiseptic.

Parts used
Leaves.

Uses

Folkloric
- Ointment made from leaves of the plant used as effective remedy for tropical ulcers.

Studies
No studies found.


Availability
Wild-crafted.

Updated October 2022 / October 2016

PHOTOS / ILLUSTRATIONS
IMAGE SOURCE: Photograph: Apocynaceae : Heterostemma cuspidatum det. Nathalie Caowynn Juhonewe & Michele Rodda / Flowering plant / Copyright © 2013 by Andrea B. Agillon (contact: pieter.pelser@canterbury.ac.nz) [ref. DOL75606] / Non-Commercial Use / Phytoimages.siu.edu
IMAGE SOURCE: Photograph: Apocynaceae : Heterostemma cuspidatum inflorescence / det. Nathalie Caowynn Juhonewe & Michele / Copyright © 2013 by Andrea B. Agillon (contact: pieter.pelser@canterbury.ac.nz) [ref. DOL75607] / Non-Commercial Use / click on image to go to source page / Phytoimages.siu.edu
Additional Sources and Suggested Readings
(1)
Heterostemma cuspidatum Decne / KEW: Plants of the World Online

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)

                                                            List of Understudied Philippine Medicinal Plants

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