Photinia

Key takeaways

Photinia belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Photinia to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Photinia from memory before moving on to harder problems.

Reference excerpt

Photinia () is a genus of about 30 species of small trees and large shrubs, but the taxonomy has recently varied greatly, with the genera Heteromeles, Stranvaesia and Aronia sometimes included in Photinia. They are a part of the rose family (Rosaceae) and related to the apple. The botanical genus name derives from the Greek word φωτεινός / phōteinós for "shiny" and refers to the often glossy leaves. Most species are evergreen, but deciduous species also occur. The small apple-shaped fruit has a size of 4 to 12 mm and forms in large quantities. They ripen in the fall and often remain hanging on the bush until well into the winter. The fruits are used as food by birds, which excrete the seeds with their droppings and thereby distribute the plant. The natural range of these species is restricted to warm temperate and tropical Asia, from the Himalayas east to Japan and south to India, Indochina and Malesia. They have, however, been widely cultivated throughout the world as ornamentals for their white flowers and red fruits. The scientific name Photinia is also widely used as the common name. Another name sometimes used is "Christmas berry", but this name is a source of confusion, since it is commonly applied to plants in several genera including Heteromeles, Lycium, Schinus, and Ruscus. The name "photinia" also continues to be used for several species of small trees in the mountains of Mexico and Central America which had formerly been included in the genus Photinia.

Description

Photinia typically grow from 4–15 m tall, with a usually irregular crown of angular branches; the branches are often (not always) thorny. The leaves are alternate, entire or finely toothed, varying between species from 3–15 cm in length and 1.5–5 cm wide; the majority of species are evergreen but several are deciduous. The flowers are produced in early summer in dense terminal corymbs; each flower is 5–10 mm diameter, with five rounded white petals; they have a mild, hawthorn-like scent. The fruit is a small pome, 4–12 mm across, bright red and berry-like, produced large quantities, maturing in the fall and often persisting well into the winter. The fruit are consumed by birds, including thrushes, waxwings and starlings; the seeds are dispersed in their droppings. Photinia species are sometimes used as food plants by the larvae of some Lepidoptera species including common emerald, feathered thorn and setaceous Hebrew character.

Taxonomy Some botanists also include the closely related North American species Heteromeles arbutifolia in Photinia — as Photinia arbutifolia. The genus Stranvaesia is so similar in morphology to Photinia that its species have sometimes been included within it, but recent molecular data indicate that the two genera are not closely related. The genus Aronia has been included in Photinia in some classifications, but recent molecular data confirm that these genera are not closely related. Other close relatives include the firethorns (Pyracantha), cotoneasters (Cotoneaster) and hawthorns (Crataegus).

Species 27 species are accepted by Plants of the World Online as of August 2025.

Extinct species A small group of extinct species have been described from the Asian, European, and North American fossil records.

†Photinia eratonis von Ettingshausen Langhian, Styria, Austria †Photinia kodorica Kolakovsky Pliocene, Kodor river, Abkhazia/Georgia †Photinia pageae Wolfe & Wehr Ypresian, Eocene Okanogan Highlands, Western North America †Photinia sarmatiaca Doweld (replacement name for Photinia acuminata Baikovskaja, 1965) Serravallian, Rostov region, Russian Federation †Photinia szaferi Zastawniak Tortonian, Mirotstowice Dolne, Lower Silesia, Poland

Formerly placed here Pourthiaea arguta (Wall. ex Lindl.) Decne. (as Photinia arguta Wall. ex Lindl.) Pourthiaea beauverdiana (C.K.Schneid.) Hatus. (as Photinia beauverdiana C.K.Schneid.) Pourthiaea pustulata (Lindl.) B.B.Liu (as Photinia pustulata Lindl.) Pourthiaea sorbifolia (W.B.Liao & W.Guo) B.B.Liu & D.Y.Hong (as Photinia sorbifolia W.B.Liao & W.Guo) Pourthiaea zhejiangensis (P.L.Chiu) Iketani & H.Ohashi (as Photinia zhejiangensis P.L.Chiu) Stranvaesia lasiogyna (Franch.) B.B.Liu (as Photinia lasiogyna (Franch.) C.K.Schneid.) Weniomeles atropurpurea (P.L.Chiu ex Z.H.Chen & X.F.Jin) B.B.Liu (as Photinia atropurpurea P.L.Chiu ex Z.H.Chen & X.F.Jin) Weniomeles bodinieri (H.Lév.) B.B.Liu (as Photinia bodinieri H.Lév.)

Ecology Photinia are susceptible to leaf blight caused by the bacterium Erwinia amylovora.

Uses

Photinias are very popular ornamental shrubs, grown for their fruit and foliage. Numerous hybrids and cultivars are available; several of the cultivars are selected for their strikingly bright red young leaves in spring and summer. The most widely planted are:

Photinia × fraseri (P. glabra × P. serratifolia) - red tip photinia, Christmas berry Photinia × fraseri 'Red Robin' - probably the most widely planted of all, this cultivar has gained the Royal Horticultural Society's Award of Garden Merit Photinia × fraseri 'Little Red Robin', a plant similar to 'Red Robin', but dwarf in stature with an ultimate height/spread of around 2–3 ft Photinia × fraseri 'Camilvy' Photinia × fraseri 'Curly Fantasy' Photinia × fraseri 'Super Hedger' - a newer hybrid with strong upright growth Photinia × fraseri 'Pink Marble' also known as 'Cassini', a new cultivar with rose-pink tinted new growth and a creamy-white variegated margin on the leaves Photinia × fraseri 'Robusta' Photinia 'Redstart' (P. davidiana × P. × fraseri) Photinia 'Palette' (parentage unknown) Photinia davidiana 'Fructu Luteo' (fruit yellow) Photinia davidiana 'Prostrata' (a low-growing form)

Toxicity Some varieties of Photinia are toxic due to the presence of cyanogenic glycosides in the vacuoles of foliage and fruit cells. When the leaves are chewed these compounds are released and are rapidly converted to hydrogen cyanide (HCN) which blocks cellular respiration. The amount of HCN produced varies considerably between taxa, and is in general greatest in young leaves. Ruminants are particularly affected by cyanogenic glycosides because the first stage of their digestive system (the rumen) provides better conditions for liberating HCN than the stomachs of monogastric vertebrates.

References

External links Flora of China: Stranvaesia

Illustrations

Worked examples

Example 1 — a first encounter with Photinia

Start with the simplest possible case. Write down what Photinia claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Photinia before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Photinia ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Photinia

In research: Photinia appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Photinia in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Photinia is common in secondary-school and first-year university syllabi. It links to neighbouring topics Garden plants, Photinia, Rosaceae genera, so understanding it makes those chapters shorter.
In everyday life: Look for Photinia outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Photinia in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Photinia means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Photinia out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Photinia in simple terms?

Photinia () is a genus of about 30 species of small trees and large shrubs, but the taxonomy has recently varied greatly, with the genera Heteromeles, Stranvaesia and Aronia sometimes included in Photinia. They are a part of the rose family (Rosaceae) and related to the apple.

Why does Photinia matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Photinia?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Photinia.