- Apocynaceae
Key to the genera of Apocynaceae
1Petals united to a lobed corona; pollen grains aggregated into pollinia2 1Petals without a corona; pollen grains free13 2Plant an erect herb or shrub; corolla-lobes strongly reflexed at anthesis3 2Plant climbing or twining; corolla-lobes never reflexed5 3Corolla white, at least inside; corona white, segments without horn-like appendages; follicle ovoid or globose, soft, inflated, with numerous soft spinesGomphocarpus → 5Corolla white, green, yellowish or pale pink6 5Corolla finally dark purple or mauve (rarely yellow-green when immature)8 6Stems and leaves more or less glaucous; corolla-tube white to pink, 10–15 mm long; pollinia pendulousAraujia > Araujia sericifera 6Stems and leaves green; corolla-tube yellowish, less than 5 mm long; pollinia erectLeichhardtia → 8Leaves and sepals more or less glabrous; corolla lobes less than 8 mm long10 10Leaves ovate or elliptic; corolla-lobes obtuse, 2–3 mm long; follicles 5–7 cm long; slender twiner of eastern forestsTylophora > Tylophora barbata 13Plant a woody shrub or climber; flowers white, pink, red, or yellow14 13Plant an erect or trailing herb or subshrub; flowers blue (rarely white)Vinca → 14Plant a vigorous woody climber to 10 m long or more; fruit a leathery capsule; mainly in wet forestsParsonsia → 14Plant a woody shrub to 6 m high; fruit a drupe or a woody follicle15 15Corolla less than 15 mm long; plant a procumbent to medium shrub to 2.5 m high; fruit a drupe; restricted to coastal areasAlyxia > Alyxia buxifolia 15Corolla 25 mm long or more; plant a large shrub to 6 m high; fruit a woody follicleNerium > Nerium oleander From: Jeanes, J.A. (1999). Apocynaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria. Vol. 4. Cornaceae to Asteraceae. Inkata Press, Melbourne.
