P. anguliger (angle-stemmed); Fig. 11.—­The branches of this kind are distinguished by having the notches along their margins more like the teeth of a saw than the others.  The habit is rather stiff and erect.  The flowers are produced near the apex of the branches, and are composed of a curved tube 6 in. long, spreading out at the top to a width of 6 in., and surmounted by a whorl of pure white petals, in the centre of which are the stamens, rather few in number, and the large, ten-rayed stigma.  The flowers are developed in December and January, and have a powerful and delicious odour.  Introduced, in 1837, from West Mexico, where it is said to grow in oak forests.

[Illustration:  Fig. 11.—­Phyllocactus anguliger.]

P. (Disocactus) biformis (two-formed); Fig. 12.—­This is a small plant, and is intermediate between this genus and the Epiphyllums.  It possesses no particular beauty or distinctive character such as would render it of much value for garden purposes.  The branches are short, rather narrow and drooping, the margins notched and tinged with red.  The flowers are borne generally on the ends of the branches, and are drooping in habit; in form they are more like the Epiphyllums than the ordinary Phyllocactuses, as they have their petals arranged in a sort of tube about 3 in. long.  The fruit is a red berry as large as a gooseberry.  Honduras, 1839.

[Illustration:  Fig. 12.—­Phyllocactus biformis.]

P. crenatus (toothed); Bot.  Reg. 3031.—­A large-flowered and very beautiful species, rivalling, in the size and fragrance of its blossoms, the gigantic night-flowering Cereus grandiflorus.  It grows to a height of about 2 ft., with round-based branches, the upper portion flattened out and the margins serrated.  The flower tube is 4 in. long, brownish-green, as also are the sepals; petals 4 in. long, in a whorl, the points curving inwards; stamens and pistil erect, forming along with the petals a large star of a pale cream-colour.  The beauty and fragrance of these flowers, which open in June, render them specially valuable for cutting and placing in rooms, where, notwithstanding their short duration, they never fail to win much admiration.  Introduced from Honduras, in 1839.  This fine species is one of the parents of the hybrids which have been raised both in this country and in America, where Mr. Hovey succeeded in obtaining some of the choicest as regards colour and size.  Some of these latter were exhibited in London two or three years ago, and were much admired.

P. grandis (large-flowered).—­The large, creamy-white flowers of this plant are like those of the night-flowering Cereus; and, in addition to the similarity in form and size between these two, there is a further one in the time when the flowers expand, this species, along with one or two others, opening its flowers after sunset; and although they remain in good condition till late on in the day following,