Species within a genus

acus, = a needle or pin; as being pointed;
-utus, = indicates possession;
acutus, = sharpened, made pointed, sharp, pointed; acute;
(acute, pointed, i.e. narrowed gradually and making an angle of less than 90º)
folium, = a leaf.
(refers to the pointed tips of the leaves)
(ld, BL, Co)

ala, = a wing;
-atus, = indicates possession or likeness.
alatus, = furnished with wings, winged.
(winged; having a thin broad margin)
(refers to the wing-like lateral petals)
(ld, BL, Co)

bis, bi-, = twice, twofold, having two-;
color, = colour, hue, tint.
bicolor, bicolorus, = of two colours, two-coloured.
(two-coloured – probably refers to the contrast between the greenish-yellow petals and the whitish sepals. Alternatively, the name may refer to the contrast between the fresh greenish-yellow flowers in the upper portion of the inflorescence and the brownish older flowers in the lower portion of the inflorescence.)
(ld, Co)

kāfir, = infidel.
(term used by early explorers - associated with Southern Africa)
(Ox, K3)

katholikos, = general, universal.
(refers to the widespread distribution of this common species)
(LS, Co)

excido, excisum, = to cut out or off, to hew out, to cut or hew down.
(cut out; often referring to sinuses)
(probably refers to the apical notch formed by the incomplete fusion of the two lateral sepals)
(ld, BL, Co)

orobanche, = a plant, broom-rape, choke-weed;
OROBANCHE (q.v.);
-oides, = like, resembling, having the form or nature of.
(The orchid Corycium orobanchoides
Broomrape, Hood Orchid) looking like Orobanche, a genus of parasitic plants. The perceived likeness must have been due partly to a superficial similarity in flower structure and habit, and to the fact that both plants turn black on drying)
(ld, BL, Co)

volucer, volucris, = flying, winged.
(refers to the resemblance of the flowers to flying insects)
(ld, BL, Co)