Hedgehog cactus (Echinocereus reichenbachii)
Echinocereus reichenbachii is a perennial plant and shrub.It is one of the smaller Echinocereus species. Immature specimens are spherical, and as they grow they become cylindrical.Plants are solitary or multi-branched in clusters of as many as twelve, with erect stems with 10 to 19 slightly undulate ribs. They reach 7.5 to 30 centimetres (3.0 to 11.8 in) tall and 4 to 10 centimetres (1.6 to 3.9 in) wide. The stems are dark green and obscured by the spines, especially when the plant is dehydrated. Areoles are elliptical or oval. They are spaced 1 to 6 millimetres (0.039 to 0.236 in) apart, with 15 to 36 spines each. The spines are tan, to brown, black, purplish black, or pink, and the tips are usually darker than the shaft. The central spines tend to be the darkest. There are up to 7 central spines per areole; they are 1 to 6 millimetres (0.039 to 0.236 in) long.Plants flower in early May and late June, and they fruit 6 to 10 weeks after flowering. Flowers open for just one day, but anthesis is usually staggered so plants have blooming flowers for a full week; buds are covered in white wool that hides the fruit as it develops. The flower's inner tepals are silvery pink or magenta; the outer portions are white, crimson, green, or multicolored. They are approximately 4.5 to 8 centimetres (1.8 to 3.1 in) by 5 to 10 centimetres (2.0 to 3.9 in), and the flower tubes are 22 to 40 millimetres (0.87 to 1.57 in) by 10 to 30 millimetres (0.39 to 1.18 in). The tube hairs are 5 to 15 millimetres (0.20 to 0.59 in) long, and the nectar chamber is 2 to 5 millimetres (0.079 to 0.197 in) deep. Flowers have 30 to 50 petals each, which are ragged or notched. Pistils are multi-lobed and green, and stamens are cream-colored or yellow. Fruits are various shades of green and 15 to 28 millimetres (0.59 to 1.10 in) long.