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North America Native Plant

Sintenis’ Quina

Sintenis’ Quina: A Rare Caribbean Treasure Worth Protecting Meet Sintenis’ quina (Antirhea sintenisii), one of Puerto Rico’s most endangered native trees. This remarkable species represents both the incredible biodiversity of the Caribbean and the urgent need for plant conservation. While you’re unlikely to find this tree at your local nursery, ...

Rare plant alert!

This plant is listed as rare and may be protected in certain regions. Its populations are limited, and removal from the wild could further endanger its survival. If you wish to enjoy this plant, consider sourcing from reputable nurseries that propagate responsibly or explore alternatives to help preserve natural populations.

Region: Conservation status by state

Status: S1: Status is uncertain but is somewhere between the following rankings: Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘

Sintenis’ Quina: A Rare Caribbean Treasure Worth Protecting

Meet Sintenis’ quina (Antirhea sintenisii), one of Puerto Rico’s most endangered native trees. This remarkable species represents both the incredible biodiversity of the Caribbean and the urgent need for plant conservation. While you’re unlikely to find this tree at your local nursery, understanding its story can deepen your appreciation for rare native plants and inspire conservation-minded gardening choices.

What Makes Sintenis’ Quina Special?

Sintenis’ quina is a perennial tree that typically grows as a single-stemmed specimen reaching heights of 13-16 feet or more. As a member of the coffee family (Rubiaceae), it’s related to plants that have given us everything from morning coffee to beautiful ornamental gardenias. The tree was named after botanist Paul Sintenis, who collected extensively in Puerto Rico during the late 1800s.

You might also encounter this species listed under its scientific synonym, Stenostomum sintenisii, in older botanical references.

Where Does It Call Home?

This tree is exclusively native to Puerto Rico, where it has evolved to thrive in the island’s tropical conditions. Unfortunately, Sintenis’ quina is now found in only a handful of locations across the island, making every surviving specimen incredibly precious.

A Conservation Alert: Critically Imperiled Status

Here’s where things get serious: Sintenis’ quina has a Global Conservation Status of S1, meaning it’s critically imperiled. With typically five or fewer known occurrences and very few remaining individuals (fewer than 1,000), this tree is teetering on the edge of extinction. This rarity status means that if you’re interested in growing this species, you should only obtain it through responsible sources that support conservation efforts.

Growing Conditions and Care

Given its Puerto Rican origins, Sintenis’ quina would likely thrive in USDA hardiness zones 10-11, requiring warm, frost-free conditions year-round. The tree would probably appreciate:

  • Tropical to subtropical climate conditions
  • Protection from freezing temperatures
  • Adequate moisture during establishment
  • Well-draining soil

However, specific cultivation requirements remain largely undocumented due to the species’ rarity and limited study.

Should You Grow Sintenis’ Quina?

The short answer is: probably not, unless you’re involved in legitimate conservation efforts. This tree’s critically imperiled status means it should be left to conservation professionals and specialized botanical gardens working to preserve the species.

Instead, consider supporting conservation by:

  • Growing other Puerto Rican native plants that are more readily available
  • Supporting organizations working to protect Caribbean plant diversity
  • Choosing native plants for your own region to support local ecosystems
  • Learning about and sharing awareness of endangered plant species

The Bigger Picture

While you might not be planting Sintenis’ quina in your backyard anytime soon, its story highlights the importance of protecting plant diversity. Every rare species like this one represents thousands of years of evolution and potentially valuable genetic resources for the future.

By choosing native plants for your own garden and supporting conservation efforts, you’re helping ensure that future generations might still marvel at rare treasures like Sintenis’ quina in their natural Caribbean habitat.

Sometimes the best way to love a plant is to admire it from afar while working to protect the wild spaces where it belongs.

Sintenis’ Quina

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

Rubiales

Family

Rubiaceae Juss. - Madder family

Genus

Antirhea Comm. ex Juss. - quina

Species

Antirhea sintenisii Urb. - Sintenis' quina

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