Citation: R. Br., Prod. Fl. Nov. Holl. 454 (1810).

Derivation: After James Logan, botanist, 1674-1751, born in Ireland, emigrated to North America with William Penn in 1699, Governor of Pennsylvania 1736-1738; wrote a book on the sexuality of plants.

Synonymy: Euosma Andrews, Bot. Rep. 8:t. 520 (1808).

Common name: Loganias.

Description:
Shrubs or subshrubs; leaves opposite, entire, flat or margins recurved, sessile or petiolate, the bases of opposite leaves joined by a membrane.

Flowers either in cymes or axillary clusters, bisexual or unisexual and then with male and female flowers on separate plants; bisexual flowers with calyx dark-green to black and deeply 5-lobed; corolla campanulate to almost rotate, 5-lobed (in S.Aust. species), lobes imbricate in the bud, obtuse; stamens 5, inserted on the tube at the throat, anthers linear to ovate; disk papillose; ovary superior, 2-celled, with many ovules in each cell; style simple, slender, stigma oblong to obovoid; unisexual flowers similar, males with stamens inserted on the tube shortly below the middle, usually included; style slender, stigma capitate, oblong or ellipsoid; disk present; ovary undeveloped; females with staminodes inserted on the tube shortly below the middle; style short and broad, stigma ovoid to broadly ovoid or capitate.

Fruit a capsule, usually black, globular, woody, contracted towards the summit, dehiscing septicidally and loculicidally at the summit so that it appears to open by 4 teeth, the 2 carpels finally almost separating; placenta adnate to the central suture.

Distribution:  About 25 species confined to Australia.

Biology: No text

Key to Species:

1. Flowers unisexual with male and female flowers on separate plants; staminal filaments inserted on the tube just below the middle
2. Tube internally thickened at the top to form a rim (sometimes incompletely formed in L. insularis), glabrous except for hairs on the rim
3. Stems minutely pubescent
4. Leaves elliptic to obovate, 3-8 mm long, margins recurved	L. insularis 2.
4. Leaves linear to narrowly elliptic, 10-20 mm long, margins not recurved	L. linifolia 3.
3. Stems glabrous to minutely papillose
5. Leaves sessile and weakly stem-clasping, linear to narrowly ovate, margins recurved	L. recurva 6.
5. Leaves shortly petiolate to almost sessile, but not stem-clasping, blade ovate to broadly ovate or narrowly elliptic, margins not recurved	L. ovata 5.
2. Tube not internally thickened at the top, pubescent inside almost to the base
6. Stem glabrous; leaf blade concave	L. sp.b 8.
6. Stems scabridulous; leaf blade flat
7. Leaf blade narrowly obovate, margins scabridulous	L. sp.a 7.
7. Leaf blade obovate, broadly obovate or broadly elliptic, margins not scabridulous	L. crassifolia 1.
1. Flowers bisexual; staminal filaments inserted on the tube at the throat	L. nuda 4.

Author: Not yet available