Xerophyte

Habit

It is a spineless succulent 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).

Seeds

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

Description

Astrophytum myriostigmaSN|1845]]SN|1845]] is a quite variable species and several breeds do exist. The "Spiral Ribs" is a rare form sought after for its unusual slightly spiralling ribs. In all other characteristics, namely size and shape of stems, flowers, fruits, roots etc. it is very similar to the standard species.

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, slightly spiralling, regular, deep, prominent, very broad and acute.

Stem

Globular to cylindric up to 60(-100) 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