Corybas, Hooker & Salisbury, 1805

Lehnebach, Carlos A., Zeller, Andreas J., Frericks, Jonathan & Ritchie, Peter, 2016, Five new species of Corybas (Diurideae, Orchidaceae) endemic to New Zealand and phylogeny of the Nematoceras clade, Phytotaxa 270 (1), pp. 1-24 : 15

Key to the five species of Corybas segregated from C. trilobus

1 Labellum broadly expanded with lamina obtrullate in front view .......................................................................... clade D ( Fig. 11 ) Labellum funnel- or dish-shaped with lamina orbicular to ovate in front view.................................................................................2

2 Dorsal sepal extending past the labellum; apex free, sometimes reflexed.........................................................................................3 Dorsal sepal shorter than the labellum; apex firmly pressing against its upper margin, not reflexed................................................6

3 Dorsal sepal apex acute ......................................................................................................................................................................4 Dorsal sepal apex retuse to obtuse......................................................................................................................................................5

4 Labellum with a white centre, dark maroon towards the margins, leaf upper surface smooth .................................... C. macranthus Labellum grading from dark red in the upper half to translucent-whitish in the lower half, leaf upper surface papillose .................. ......................................................................................................................................................................................... C. papillosus

5 Labellum dark red to maroon with a pale green to yellowish centre, lateral sepal> 19 mm, leaf cordiform to widely ovate ............ ........................................................................................................................................................................................... C. confusus Labellum dark red around the margins with a white centre, lateral sepal <18 mm, leaf reniform to cordiform ................................ .............................................................................................................................................................................. C. sanctigeorgianus

6 Flowers translucent or mostly pale-coloured .....................................................................................................................................7 Flowers dark maroon with a pale green centre...................................................................................................................................9

7 Flowers pale green or yellowish with a few pink blotches .................................................................................................... C. wallii Flowers with a mostly translucent labellum with dark red or maroon streaks or blotches ................................................................8

8 Flower broadly ovate in frontal view; apex of dorsal sepal emarginated to retuse; petals <43 mm long; petiole <13 mm long; leaf width <16 mm ....................................................................................................................................................................... C. vitreus Flower orbicular to widely elliptic in frontal view; apex of the dorsal sepal rounded; petals> 43 mm long; petiole> 13 mm long; leaf> 18 mm width............................................................................................................................................................... C. trilobus

9 Flowers commonly <6 mm diameter; dorsal sepal green; lateral sepals <13 mm long, petals <32 mm long; ovary curved backwards at c 45° ................................................................................................................................................................. C. hypogaeus Flowers commonly> 8 mm diameter; dorsal sepal dark maroon; lateral sepals> 16 mm long; petals> 35 mm long; ovary straight. ........................................................................................................................................................................................... C. obscurus

Figures

FIGURE. Median network analyses (MNA) of a subset of the C. trilobus aggregate (i.e. those in the clade A from Fig. 11) based on concatenated DNA sequence data from ITS, trnL-trnF and psbJ-petA. Stars and arrow indicate accessions discussed in the text. NI: North Island, SI: South Island.