Hill described twelve species of Amaryllis:

Hill's plate of Amaryllis reginaeis similar to that painted by Mrs. Bury, but was described as white streaked crimson. His Amaryllis biflora is presumably the plant described by Sloane, or a two-flowered variant. Hill's description of Amaryllis reginae is suspiciously similar to Amaryllis vittata which was illustrated by Buc'hoz in 1776, though shorter.

In the 12th volume of this work (1767) Hill described the newly introduced Amaryllis undulata [Nerine undulata], which he called Wavy Fairwort.

The stalk supports several Flowers; they are bell-shaped, equal, and waved a little at the edges; the Style and Filaments droop.

This is a Perennial, native of Mexico, and of some of the West India Islands; a very noble and elegant Plant: it grows with a firm stem to a foot high, and flowers in August. The stalk is of a grey-green, stained with a deep and dusky brown: the Leaves, which appear afterwards, are of a good strong green: the Flowers numerous and most elegant; they are of a delicate white, with some little tinge of green, especially toward their base; and they are streaked, in a delicate manner, with a fine strong crimson. They resemble the Bella Donna extremely; but there is an absolute and fixed difference: the Petals in this are waved at the edge, and strait at the base; whereas the Petals of the Bella Donna have a bend at the base, and are strait at the edges.

This has been known by the name of the American Lilly, and Royal Lilly; and even writers of great merit have given it the term Lilium; as they have called others of this Genus Sisyrinchiums, Colchicums, and Narcissus's; nay Tulips. 'Tis to the accuracy of the excellent Linnaeus we owe the establishing such characters of this elegant race of Plants, as place them all together under one name; as they are truly one in nature. If the Classical characters of that Author were as well arranged as his specific, the world would have more obligations to him than to all other writers; and himself, would he now set about it, enriched with his present store of experience, would be indeed immortal!

The stalk supports two Flowers; the Petals are lanced and hollowed: the Style and Filaments ascend.

This is a Perennial, native of Antigua, and other parts of the West Indies; a very fine plant, conspicuous and striking in the highest degree; and which preserves its Flowers longer than most others of its kind. It grows a foot high, and flowers in July. The stalk is of a fresh and fine green, tho' there be in it a tinge of blueish: the Flowers are of a full deep scarlet; 'tis not a glowing or a gaudy, but a rich and most noble colour; toward the bases of the Petals, there is a tinge of yellow and of green; and the rudiment of the Fruit, on which they stand, is of the richest green; but grows brown after the Flower has fallen.

There are several Flowers upon a Stalk; the petals are equal, and have a bend at the base: the whole Flower is bell-shaped: and the style and Filaments droop.

This is a Perennial, native of our West India Islands, and of Surinam; and has long been and will be for ever a favorite in our best gardens: it is tall, erect, and very noble plant. The Stalk, which rises to more than two feet high, is firm, ribbed, and of a fine green, edg'd with an undulated Film of a light brown: the Leaves are of a fair grass green: the scabbard is pale and brownish: the Flowers, which are as big as Lillies, throw themselves every way with a noble freedom; a pattern for the fancy of a painter: their color is white, with a faint tinge of greenish in some places, which adds extremely to their beauty; and they are streaked along the backs of the Petals with a beautiful crimson.