The genus comprises a large number of species (approximately 65). They are plants of low growth with erect or occasionally prostrate, cylindrical branches, growing singly or forming groups. They always have large and beautiful flowers. Most species grow in full sunshine but a few prefer half shade. They are natives of the western states of the U.S.A. And Mexico, and in cultivation should be grown in a mixture of 1 part loam, 1 part leaf soil, 1 part sharp sand, and a half part broken brick.

Echinocereus rigidissimus. The stem is stiff and erect, its peculiarity being that its spines are of different colours in horizontal layers around the plant, naturally indicating the age of the plant and suggesting the name of “rainbow cactus”. The areoles are elongated and bear 16 to 20 radial spines which are spreading and comb-like. Flowers large, purplish or pink in colour. 6A

Echinocereus pentalophus. A species of easy cultivation. Stems have only 4 to 6 ribs, and very short white spines with brown points, 3 to 5 radials, no central spines. The plant is distinguished by its very large lilac or pink flowers.

Echinocereus Blanckii. An allied species to E. pentalophus, with prostrate branches, possessing 5 to 7 ribs with brownish spines growing from brownish areoles. The flowers are similar, but of a lighter shade and with narrower petals.

Echinocereus De Laetii. A beautiful plant, its columns 4 to 8 inches in height, with long, white, soft and even waxy hairs, which are really modified spines covering the whole plant, giving it a strong resemblance to the “old man cactus” (Cephalo-cereus senilis). The stems have 20 to 34 straight ribs; the areoles are large, with 18 to 36 radial spines and about s central spines. The plant requires full sunshine and an abundant supply of water in summer. Its pink flowers, when produced, are very large in relation to the size of the plant.

Echinocereus Fendleri. The stems are a dull green, with 9 to 12 ribs. Radial spines number 8 to 13, and are stout, spreading and occasionally comb-likein arrangement, pale yellow, usually tipped with brown; there may be 1 or 2 awl-shaped central spines, curving upwards. Flowers, pink, rose and rose- purple, nearly 4 inches long and 4 inches wide. It is a plant of rather slow growth, easily raised from seed.

Echinocereus stramineus. The stems are erect and stiff, branching from the base, pale green with 10 to 13 ribs, and deeply furrowed. Small white areoles bear about 10 radial spines, with 3 or 4 centra) spines. Flowers, purple, but sparingly borne.

Echinocereus knippelianus. Has a thick, dark green stem, with 5 to 7 ribs, bearing feeble short yellow spines. Flowers, dark brown outside, carmine-violet inside.

Echinocereus triglochidiatus. A most attractive species and easy to grow. The stems are globose to cylindrical, simple or clustered, with 5 to 14 ribs. Radial spines number 3 to 12. The flowers are funnel-shaped, scarlet to crimson, and remain open for several days.

Echinocereuspectinatus. Central Mexico. Often seen in collections. A free-flowering species, of easy cultivation. Stems roundish to cylindrical, branching from the base, with 20 obtuse ribs. Oval areoles bear about 25 radial spines, comb-like and spreading, and 2 to 6 very short central spines. The flowers are pink inside, with white hairs and spines outside.

Echinocereus Engelmannii. An interesting species from Mexico, California, Arizona, Nevada and Utah. A rather slow grower. The stems are usually erect and stiff, branching from the base, pale green, with 11 to 14 low obtuse ribs separated by narrow furrows. Large, round areoles, about J inch apart; radial spines number 12, and are awl-shaped and angular; central spines, 4 or more, are angular and thick; flowers, purplish red.

Echinocereus Fitchii. Texas. Erect stems, dull green, branching from the base, with 12 to 14 ribs. The spines, numerous and yellowish, stand out from the plant. Very free flowering, the pink flowers borne at the top of the stem.

Echinocereus dasyacanthus. Mexico, New Mexico and Texas. A free-flowering plant with P. Flower of Selenicereus pteranthus, Queen of the Night. P. EchinocereusFendlert with flower, P. Flowers of Echinocereus triglochidiatus. P. Echinocereus pectinatus in flower. P. Echinocereus dasyacanthus in flower. P. Eehinopsis in flower. P. Opuntia elala. P. Flowers of Opuntia versicolor (variable in colour). P. Echinocactus ingens visnaga. P.76 Ariocarpus retusus. P. Echinocactus Grusonii. P./

Notocaclus scopa Candida. P. Astrophytum myriostigma. P. _- Echinocereus Fendleri. P. Mammillaria species. P.

Echitiocereus viridiflorus. New Mexico. Stems cylindrical, freely branching from the base, dark green with 13 ribs. The spines are brightly coloured, consisting of 15 radial spines and a or 3 white or reddish central spines. The plant has small green flowers.

Echinocereus chloranthus. Mexico, Texas and New Mexico. Resembles E. viridiflorus, the main difference being in the flowers, which are rich brown. The spines are shorter, and not so brightly tipped with red. When not in bloom it is difficult to tell these two apart.

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