Citation: Labill., Nov. Holl. Pl. Sp. 2:8 (1806).

Derivation: Greek kalyx, calyx; thrix, hair; alluding to the long-attenuate sepal apices in the first species known, C. tetragona Labill.

Synonymy: Not Applicable

Common name: Fringe-myrtles.

Description:
Shrubs; glabrous or with simple hairs; with or without bud scales; leaves alternate; stipules present or absent, minute.

Inflorescences 1-flowered, the flower pedunculate and subtended by a pair of persistent or deciduous free or connate bracteoles; flowers bisexual, perigynous or epigynous; hypanthium short or long, free from, or adnate to, the style; calyx segments 5, imbricate, persistent, the apex emarginate to long-attenuate (awned); petals 5, imbricate, deciduous; stamens indefinite in number, 1- or several-seriate, the anthers versatile, dehiscing by longitudinal slits; ovary 1-celled, the ovules 2, anatropous, on an axile-basal placenta; style slender, the stigma minute.

Fruit dry, indehiscent, 1-seeded; testa membranous; embryo straight, obovoid to narrowly obovoid, the cotyledons short.

Distribution:  About 70 species, all Australian.

Biology: No text

Taxonomic notes: J. Black maintained Lhotskya Schauer as a genus distinct from Calytrix. The distinction breaks down and the two genera are being combined in a revision of Calytrix (Craven, in press).

Key to Species:

1. Hypanthium 1.5-4.75 mm long
2. Plant glabrous	C. sp. A 4.
2. Plant pubescent
3. Bracteoles persistent	C. alpestris 1.
3. Bracteoles deciduous	C. sp. B 5.
1. Hypanthium 7-16 mm long
4. Stamens 1-sedate, bracteoles slightly or not keeled
5. Hypanthium adnate to the style for part of its length	C. tetragona 3.
5. Hypanthium free from the style throughout
6. Leaf blade broadly obtriangular to depressed-angular-obovate in transverse section	C. involucrata 2.
6. Leaf blade suborbicular in transverse section	C. sp. C 6.
4. Stamens 2-seriate, bracteoles strongly keeled	C. sp. D 7.

Author: Prepared by L. A. Craven