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Genus Darwinia Family Myrtaceae

Description: Shrubs.

Leaves opposite, terete, linear or bilaterally flattened.

Inflorescences an aggregation of axillary flowers at apex of shoot subtended by green or coloured bracts. Flowers 5-merous, each flower enclosed by 2 bracteoles when in bud. Sepals usually small, ± petaloid. Petals white, usually enclosing lower part of style. Stamens 10, alternating with 10 staminodes; anthers globose, opening by terminal pores. Ovary half-inferior, 1-locular; placenta basal; ovules 2–10; style projecting from flower, bearing a group of hairs below stigma.

Fruit indehiscent; only slightly enlarged from flower; seed usually 1.


Distribution and occurrence: World: c. 45 spp., endemic Aust., N.S.W., Vic., S.A., W.A.

Text by Peter G. Wilson
Taxon concept:

 Key to the species 
1Leaves laterally compressed, keeled2
Leaves terete or nearly so.Darwinia fascicularis
2Bracteoles extending beyond perianth; style recurved, with hairs in a lateral tuftDarwinia taxifolia
Bracteoles shorter than perianth; style straight or curved, hairs usually in a ring
                       Back to 1
3
3Sepals more than three-quarters the length of petals; hypanthium papillate between ribs4
Sepals less than three-quarters the length of petals; hypanthium smooth between ribs (rarely slightly papillate in D. leptantha)
                       Back to 2
5
4Hypanthium 7–12 mm long; style 12–20 mm longDarwinia grandiflora
Hypanthium 3–5 mm long; style 4–9 mm long
                       Back to 3
Darwinia diminuta
5Flowers, including style, 4–9 mm long; bracteoles yellow-green or yellow-brown6
Flowers, including style, 9–25 mm long; bracteoles dark brown or red-purple
                       Back to 3
8
6Hypanthium 1–2 mm diam., bracteoles 3.5–6 mm long, persisting until after anthesis7
Hypanthium more or less 0.5 mm diam., bracteoles 2–3.5 mm long, caducous
                       Back to 5
Darwinia leptantha
7Hypanthium glabrous between the broad or rounded longitudinal ribs.Darwinia camptostylis
Hypanthium papillose between the distinct narrow ribs.
                       Back to 6
Darwinia briggsiae
8Hypanthium ± 1.5 mm diam., with distinct glaucous ridges9
Hypanthium 1.5–2.5 mm diam., ribs obscure or broad and rounded
                       Back to 5
10
9Leaves glaucous, 8–17 mm long; bracteoles red-brown, caducousDarwinia glaucophylla
Leaves green, 6–10 mm long; bracteoles purple-red, persisting till after anthesis
                       Back to 8
Darwinia biflora
10Peduncles 4–7 mm long; style 6–10 mm longDarwinia peduncularis
Peduncles 1–2 mm long; style 14–20 mm long
                       Back to 8
Darwinia procera

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