May 16, 2018 0 Commentsadmin
he stem is flat, compressed, the crown depressed and covered with brownish-white felt, about 6 cm high, 10 to cm across, skin grey-green with small white spots. The ribss, about 8, are flat and slightly rounded with a shallow groove. The areoles are from 4 to 9 mm across, grey, felted. The flowers are about 3 cm long, 6.5 cm across, broadly funnel-shaped, glossy yellow with carmine throat. The stamens reach halfway up the tube, the filaments are yellow, the anthers darker, the style, with 6 to 8 lobed stigma, is pale yellow and is taller than the stamens. The fruit is dry, brown, more than 1 cm across. The seed is large, boat-shaped and brown.
The specific name asterias means covered with stars or spots. This cactus was first discovered more than 120 years go by Baron Karwinski. He sent specimens to St. Petersurg which were not seen again but he also sent one specimen to J. Ger. Zuccarini, then Professor at University of Munich, who in 1845 described it as Echinocactus asterias. This specimen also died and the species was onsidered to be extinct but in 1923 A. V. Fric recognized asterias on a visit to the botanical garden in Mexico City.
silver dollar cactus
The complete book of cacti & succulents, Terry Hewitt, ISBN 0751300497
Cacti and Succulents, Paul Hamlyn, ISBN –