Hoya Naming Conventions, Nomenclature, and Genus Sections

February 21, 2026

Hoyas, also known as wax plants, are beloved for their attractive foliage and fragrant blooms. Understanding how these plants are named and classified helps collectors and growers correctly identify, care for, and communicate about their plants — and it's more fascinating than you might think.

1. Hoya Naming Conventions

Binomial Nomenclature

Developed by Carl Linnaeus, binomial nomenclature gives every plant a two-part name: Genus + Species. For hoyas, this looks like Hoya carnosa.

Cultivar Names

Cultivars are selectively bred plants with specific traits. Their names are written in single quotation marks — for example, Hoya carnosa 'Krimson Queen'.

Hybrid Names

Hybrids are cross-bred plants from different species or cultivars, written with a multiplication sign — for example, Hoya carnosa × Hoya obovata.

2. Frequently Used Suffixes in Hoya Names

Once you learn these suffixes, hoya names start to tell a story:

-ensis: Place of origin (e.g., Hoya mindorensis)
-flora: Type of flowers (e.g., Hoya multiflora)
-phylla: Leaves (e.g., Hoya macrophylla)
-oides: Resembling (e.g., Hoya australoides)
-folia: Describes leaves (e.g., Hoya parvifolia)
-petala: Describes petals (e.g., Hoya grandipetala)
-glabra: Smooth or hairless (e.g., Hoya glabra)
-pubescens: Fuzzy or hairy (e.g., Hoya pubescens)
-nervia: Prominent veins (e.g., Hoya nervosa)
-magnifica: Magnificent or striking (e.g., Hoya magnifica)
-compacta: Compact growth habit (e.g., Hoya compacta)
-angustifolia: Narrow leaves (e.g., Hoya angustifolia)
-macrantha: Large flowers (e.g., Hoya macrantha)
-ii: Named after a person (e.g., Hoya kastbergii)
-ae: Named after a female
-iana: Named after a male
-iorum: Named after a family

3. How to Write and Describe Unnamed Species

Not every hoya has a formal scientific name yet. Here's how unnamed or unidentified species are referenced:

"sp." indicates an unidentified species — e.g., Hoya sp.
Geographical or descriptor tags help differentiate — e.g., Hoya sp. Sulawesi, Hoya sp. Pink Leaves, or Hoya pubicalyx (Splash)
Field or collection numbers are assigned by collectors — e.g., Hoya sp. GPS-345

4. How a Hoya Name is Filed

To formally name a new hoya species, botanists must document its characteristics (morphology, habitat, differences from related species), publish a formal description in a scientific journal, and register the name in databases including the International Plant Names Index (IPNI), Plants of the World Online (POWO), and the International Cultivar Registration Authority (ICRA) at hoyacultivars.org.

5. Structural Parts of a Hoya Plant

Stem: The main supporting structure that transports nutrients and water between roots and leaves.
Leaves: Flat structures responsible for photosynthesis, varying widely in shape, size, and texture.
Nodes: Points along the stem where leaves, roots, or flowers emerge — key areas for propagation.
Internodes: Sections between nodes that extend the stem's length.
Peduncle: The flower stem that remains after blooms fall off — future blooms form from the same peduncle, so never remove it!
Pedicel: A small stem connecting each individual flower to the peduncle.
Umbel: The flower cluster where individual flowers attach by pedicels. Can be concave or convex depending on species.
Sepals (Calyx): The five outermost parts of the flower that protect the bud before it opens.
Petals (Corolla): The visible, colorful star-shaped parts of the hoya flower.
Corona: The crown-like structure in the flower center — a key classification feature in hoyas.
Gynostegium: A specialized structure where stamens and pistils are fused, helping with pollination.
Pollinarium: The structure containing the pollen sacs, which plays a key role in hoya pollination.
Roots: Absorb water and nutrients. Some hoyas develop aerial roots that absorb moisture from the air.
Tendrils: Thin, flexible structures used for climbing or securing the plant to a surface.