Echinomastus warnockii, sclerocactus warnockii
Warnock's pineapple cactus
West Texas; the Big Bend area, westwards towards El Paso
Globe or short cylinder, up to 4 inches tall and 2.5 inches across
Desert scrubland, hills, gravelly washes
White or cream, with pinkish midstripes on the outer sepals; blooming February to March
Distribution map for echinomastus warnockii
Echinomastus warnockii may be distinguished from some similar-looking species in the same region - far west Texas centered on the Big Bend area - by the spines; both the zero to four (usually one) central spines and 11 to 17 radial spines are similar in size and color. Other species have smaller, thinner radials. Spine clusters overlap, but do not hide the greyish green stem. Spine clusters form on tubercles which are arranged in spiral, vertical rows (13 of them). Spines are grey or pale yellow-brown, and up to one inch in length, the covering is relatively sparse, allowing the green stem color to be clearly visible. Plants are always solitary.
Relatively large flowers, one inch across, grow in springtime at the tip of the stem; they have a lobed green or yellow-green stigma at the center, surrounded by many stamens, with slender yellow filaments and darker yellow anthers, and tepals which are mostly white or pale cream, often with darker midstripes on the undersurface. The irregularly-shaped fruits are light green, maturing to purplish, and they appear between May and July.