Whittock, Nathaniel: The Art Of Drawing And Colouring From Nature, Flowers, Fruit, And Shells: To Which Is Added, Correct Directions For Preparing The Most Brilliant Colours For Painting On Velvet, With The Mode Of Using Them, Also The New Method Of Oriental Tinting ; With Plain And Coloured Drawings (London, 1829)

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The light tint of the leaves is gamboge, with a little blue, and, in parts,
a slight touch of burnt sienna. The dark parts of the leaves having been
first put in with the neutral tint, they will only require veining to be
finished. The stem is coloured with umber, and afterwards touched in
parts with cold green to give it a rough mossy effect. The stamens are
coloured with gamboge or king's yellow, and the dark touches given
with burnt umber.
If the student gives all his attention to the directions for painting
this subject, he will find it to be the most elaborate and pleasing of
any that preceded it; and it will shew him that there is no more dif-
ficulty in producing a group than there is in a single ssower.

LESSON X.
THE SOUTH-AMERICAN PASSION FLOWER.
This beautiful specimen of a very rare plant, which has been but
recently introduced into England, will require all the skill and atten-
tion possessed by the student to draw and colour it correctly. The
main stalk is drawn first, very lightly; and the footstalks of the leaves,
and the stalk bearing the ssower, drawn from it.