The pink and carnation family
Caryophyllaceae gives the trade two of its hardest working flowers, the carnation and gypsophila, and it is responsible for the name of a color. The word pink meant this flower long before it meant the shade, and the flower was named for its frilled petal edge rather than for being pink at all.
around 86 genera
roughly 2,200 species
Mostly the northern temperate zone, centered on the Mediterranean
Everything in this guide that belongs to Caryophyllaceae
The reliable field mark for this family is the stem. It carries visibly swollen nodes wherever a pair of leaves joins, so a carnation stem looks knuckled rather than smooth, and it forks in twos from those joints rather than branching at random.
Those joints matter in practice. A carnation snaps cleanly at a node if it is bent, which is how stems arrive broken from careless handling, and it is why the old advice is to cut between nodes rather than through one. A cut made across a swollen joint takes up water poorly.
The leaves are narrow, often gray green with a waxy bloom, set in opposite pairs that clasp the stem. The whole plant reads as wiry rather than lush, which is exactly what its Mediterranean origins would lead you to expect.
Dianthus means flower of the gods, from the Greek. The English name pink refers to the petal edge, which looks cut with pinking shears, and the verb is the older word. The color took its name from the flower in the seventeenth century, not the other way around.
Carnation is a separate puzzle nobody has settled. Coronation is the most likely origin, from the flower's use in garlands, though incarnation and a reference to flesh color both have their supporters.
The clove scent in an old fashioned border pink is not a coincidence either. These species carry eugenol, the compound that gives cloves their smell, which is why the flower was once used to spice wine. Most modern commercial carnations have had that scent bred almost entirely out in favor of size and vase life. It is a real loss, and worth mentioning to any customer old enough to remember it.
Carnations are among the longest lasting cut flowers there are, two to three weeks as a matter of routine. Gypsophila is similar and dries with no intervention at all. This family gives good value, and its reputation as cheap has far more to do with volume and decades of gas station bouquets than with quality.
The one real weakness is ethylene. Carnations are unusually sensitive to it, and ethylene comes off ripening fruit, decaying flowers and exhaust fumes. A carnation kept near a fruit bowl will close up and go over in a fraction of its normal life. The symptom is distinctive: petals curl inward and the flower looks asleep rather than wilted.
Growers treat for this, but a florist can help by keeping them away from produce, clearing dead material out of the bucket promptly, and telling the customer plainly not to stand them next to the fruit. It is the most useful single piece of advice you can send out with a carnation.
Outside the florist's bucket this family is best known for weeds. Chickweed is a member and is in nearly every garden in the country. So is red campion in the hedgerows, ragged robin in damp meadows, and the soapwort whose roots were genuinely used to wash wool and delicate cloth.
Soapwort is not folklore. It contains saponins, which foam in water, and textile conservators still use a preparation of it on historic fabrics that modern detergent would destroy.
There is no significant food crop here at all, which is unusual for a family this large and this widespread. What it produces instead is ornament and nuisance in roughly equal measure, and the ornament has been in cultivation for well over two thousand years.
Most genera in this guide hold a single flower, so they are covered on that flower's own page. One genus in Caryophyllaceae holds several and has a page of its own.