North America Native Plant

Sintenis’ Milkvine

Botanical name: Matelea sintenisii

USDA symbol: MASI4

Life cycle: perennial

Habit: vine

Native status: Native to Puerto Rico  

Synonyms: Gonolobus sintenisii Schltr. (GOSI)  âš˜  Vincetoxicum sintenisii (Schltr.) Britton (VISI2)   

Sintenis’ Milkvine: A Mysterious Native Puerto Rican Treasure Meet Sintenis’ milkvine (Matelea sintenisii), one of Puerto Rico’s lesser-known native botanical gems. This perennial herb belongs to the fascinating world of milkvines, but unlike its more famous cousins, this particular species keeps a pretty low profile in the gardening world. If ...

Sintenis’ Milkvine: A Mysterious Native Puerto Rican Treasure

Meet Sintenis’ milkvine (Matelea sintenisii), one of Puerto Rico’s lesser-known native botanical gems. This perennial herb belongs to the fascinating world of milkvines, but unlike its more famous cousins, this particular species keeps a pretty low profile in the gardening world. If you’re a plant enthusiast in Puerto Rico or someone passionate about Caribbean native flora, this might just be the mystery plant you’ve been waiting to learn about!

What Exactly Is Sintenis’ Milkvine?

Sintenis’ milkvine is what botanists call a forb herb – basically, it’s a soft-stemmed perennial plant without any woody tissue above ground. Think of it as the opposite of a tree or shrub. This native Puerto Rican species has some interesting aliases in the scientific world, having been known as Gonolobus sintenisii and Vincetoxicum sintenisii in the past. Like many plants, it’s gone through a few name changes as scientists have gotten better at understanding plant relationships.

Where Does It Call Home?

This milkvine is exclusively native to Puerto Rico, making it a true island endemic. You won’t find wild populations of this plant anywhere else in the world! It typically grows in non-wetland areas but can occasionally pop up in wetland environments – botanists call this facultative upland behavior.

The Challenge: Limited Growing Information

Here’s where things get a bit tricky for gardeners. Sintenis’ milkvine falls into that frustrating category of plants that we know exist but don’t have much practical growing information about. There’s limited documentation on:

  • Specific growing conditions it prefers
  • How big it gets or how fast it grows
  • What it actually looks like in full bloom
  • How to propagate or care for it
  • Which pollinators visit its flowers

Should You Try Growing It?

If you’re in Puerto Rico and passionate about native plants, Sintenis’ milkvine could be an interesting addition to a native plant collection – but proceed with caution and responsibility. Since we don’t know its rarity status, it’s crucial to:

  • Never harvest plants from the wild
  • Only obtain plants from reputable native plant nurseries
  • Consider it an experimental addition to your garden
  • Share any growing observations with local botanists or native plant societies

The Bigger Picture

While we may not have a complete growing guide for Sintenis’ milkvine, supporting native plants like this one is important for maintaining Puerto Rico’s unique biodiversity. Every native species plays a role in the local ecosystem, even if we don’t fully understand it yet.

As a perennial herb, it’s likely to be relatively low-maintenance once established, and its non-wetland preference suggests it might be suitable for typical garden conditions. However, without specific cultivation information, growing this plant remains more of an adventure than a sure bet.

What We’re Still Learning

Sintenis’ milkvine represents one of those fascinating gaps in our horticultural knowledge. While we know it exists and where it belongs in the plant family tree, the practical details that gardeners crave – like flower color, mature size, growing requirements, and wildlife relationships – remain largely mysterious.

If you’re a gardener in Puerto Rico interested in native plants, consider connecting with local botanical gardens, universities, or native plant societies. They might have more information about this elusive species or could benefit from your observations if you do manage to grow it.

Sometimes the most rewarding plants are the ones that challenge us to become citizen scientists, contributing to our collective understanding of the incredible biodiversity right in our own backyards!

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Caribbean

FACU

Facultative Upland - Plants with this status usually occurs in non-wetlands but may occur in wetlands

Sintenis’ Milkvine

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Gentianales

Family

Asclepiadaceae Borkh. - Milkweed family

Genus

Matelea Aubl. - milkvine

Species

Matelea sintenisii (Schltr.) Woodson - Sintenis' milkvine

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA