Key to the species of Dendrophthoe

1Anthers finely acuminate and acute
1'Anthers blunt, sometimes broadly acute but not acuminate
2Corolla 55-90 mm long
2'Corolla 18-55 mm long
3Bracts longer than the ovary; flowers closely sessile; inflorescence and flowers with a dense long loose indumentum
3'Bracts shorter than the ovary; flowers shortly pedicellate; inflorescence and flowers with a close tomentum or glabrescent
4Indumentum ochre to red-brown; stems robust; lamina 10-25 cm long; corolla less than 30 mm long
4'Indumentum white to light ochre; stems slender; lamina mostly 5-10 cm long; corolla usually more than 30 mm long
5Inflorescence axis normally more than 40 mm long and bearing more than 20 flowers
5'Inflorescence axis up to 30 mm long and bearing up to 20 flowers
6Corolla less than 50 mm long
6'Corolla more than 50 mm long
7Inflorescence and flowers entirely glabrous; corolla mostly more than 30 mm long
7'Inflorescence and flowers sparsely to densely ochre- to red-brown-tomentose; corolla mostly less than 30 mm long
8Leaves thickly coriaceous, bullate between the depressed midrib and lateral veins; anther much shorter than the free part of the filament; corolla split to near the middle at anthesis
8'Leaves thinly coriaceous, not bullate; veins not depressed; anther ± equal to the free part of the filament; corolla split almost to the base at anthesis.
9Corolla densely tomentose, lacking knobs on the petals; leaf lamina relatively thin
9'Corolla in mature bud glabrous or nearly so, with a knob on each petal just below the neck; leaf lamina relatively thick
10Corolla tube regular, inflated and more or less bell-shaped
10'Corolla tube more or less curved, slender or weakly inflated, gradually widened upwards, usually split more deeply on one side
11Leaves linear to narrow lanceolate, pendulous; corolla 4-merous, in mature bud not winged or longitudinally ribbed in the inflated part; inflorescence a false umbel of 2 or 3 flowers of almost equal age
11'Leaves elliptic to ovate or obovate, spreading; corolla 5- or rarely 4-merous, in mature bud winged or longitudinally ribbed in the inflated part; inflorescence a few- to several-flowered raceme, sometimes subumbellate
12Corolla glabrous or nearly so; fruit warty; inflorescence 2- to 4-flowered
12'Corolla sparsely to densely white or grey (rarely brown) tomentose; fruit smooth; inflorescence usually 6- to 12-flowered
13Inflorescences several, clustered at enlarged gall-like leafless nodes
13'Inflorescences solitary or few, in leaf axils or at younger leafless nodes
14Leaves thin, undulate at margin when dry, with slender petiole
14'Leaves thick, not undulate at margin when dry, with a thick winged petiole....
15Corolla less than 20 mm long
15'Corolla 20-30 mm long
15''Corolla more than 30 mm long
16Inflorescence and flowers with a persistent thick red-brown indumentum; corolla in mature bud more or less cylindric
16'Inflorescence and flowers with a short tomentum, the corolla glabrescent; corolla in mature bud with a distinct neck
17Corolla 4-merous, obtuse in mature bud
17'Corolla 5-merous, attenuate towards an acute apex in mature bud
18Leaves opposite, sessile, cordate at the base
18'Leaves mostly scattered, petiolate, not cordate at the base
19Leaves usually darker and more lustrous on the upper surface...
19'Leaves dull on both sides
20Inflorescence entirely glabrous; calyx limb truncate
20'Inflorescence and flowers white tomentose, especially the ovary; calyx limb distinctly toothed