Xerophyte

Seeds

Dark brown, shining, with a large depressed hilum, the margins being turned in.

Description

A. myriostigma (many dotted) is a spineless plant, usually solitary or with very few basal branches. A transverse section of the stem reveal a perfect star shaped form (like the common star-fish) giving the plant the appearance of a bishop's mitre (hence the common name Bishop's cap)

Roots

Fine, fibrous.

Flowers

Funnelform, 4-7 cm long glossy yellow and sweet scented from the areole at the tip of the stem on mature plant. Outer perianth segments narrow, with brown scarious tips. Inner perianth segments numerous, oblong yellow with a silky shine. Scales on ovary tube scaroious, imbricated, very narrow often bristly tipped, with long wool in their axil.

Blooming Season

Flowers appear intermittently throughout the warm months from April to September. Plants may take up to six years to flower.

Spines

Wanting.

Ribs

Usually 5, sometimes 4(or 3) that increase to eight or more with age ( rarely even 10), vertical, regular, deep, prominent, very broad and acute.

Stem

Globular to cylindric up to 60(-100) cm tall (but usually about 150 cm tall) and 10-20 cm in diameter, bright green, covered with many minute white hairy scales that give it a characteristic chalk-white or silvery-grey appearance, but sometime naked. The scales are composed of very fine interwoven hairs, which, under a microscope, are very pretty object.

Fruits

2-2.5 cm in diameter, greenish to tannish-red Covered with brown, overlapping scales, with long wool in their axil.

Areoles

Closed together