Hoya Morphology
What Makes a Hoya, a Hoya
Roots
Hoyas develop roots not only from nodes, but also along stems and even from internodes. This allows them to anchor easily as epiphytes in nature, and explains why aerial roots often appear when grown in cultivation.
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Stem
The main structural part of the plant. In Hoyas, stems are usually vining, allowing the plant to trail or climb.
Node
The point on a vine where leaves, peduncles, new vines or roots emerge.
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Internode
The section of stem between two nodes. In Hoyas, internodes can vary from very short (leaves packed close together) to quite long (leaves spaced far apart). Roots sometimes form from internodes as well, especially in high humidity.
Umbel
A rounded or flat-topped cluster of flowers that all arise from a single point, typical of Hoyas.
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Peduncle
The flower stalk of a Hoya. Flowers will drop but don’t cut it off — Hoyas will bloom from the same peduncle again and again.
Corolla
The outer whorl of the flower, made up of petals. In Hoyas, the corolla is usually star-shaped and in many species it is reflexed.
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Corona
The inner part of the flower (often contrasting in color), usually a crown-shaped structure that sits on top of the corolla.
Sun-stress
The change in leaf color (usually red, purple, or bronze) when Hoyas are exposed to higher light. Highly prized by Hoya enthusiasts.