Astrophytum asterias

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.

Known synonyms:
Echinocactus asterias
Known common (English) plant names:
Sea urchin
silver dollar cactus
Natural habitat:
Tamaulipas, Mexico and southern Texas, USA
Maximum plant height or length:
– In centimeters:
5 centimeter(s)
– In inches:
2 inch(es)
Maximum plant width or diameter:
– In centimeter(s) :
13 centimeter(es)
– In inches:
5 inch(es)
Minimum temperature:
– In degrees Celsius (°C):
10 °C
– In degrees Fahrenheit (°F):
48 °F
Estimated age when fullgrown:
Estimated age of first flowering:
Flowers appear in / from… :
Spring until end of summer
Duration of a flower:
Flowers primary color:
Yellow
Ideal sun exposure:
Full sun or sunny
Cultivation description:
Cultivation is not difficult. During the growing period it requires light, heat and moisture, in winter light and a temperature of about 10°C. In the case of grafted plants water is supplied only in such quantities as to keep the stock from becoming too dry. Imported plants are not watered at all. It is propagated only from the seed which soon germinates at a temperature of about 25°C. It is a sensitive plant and rots if overwatered. In winter, when dry and dormant, the globular or saucer-like body shrinks to a flattish disc.

References:

The complete book of cacti & succulents, Terry Hewitt, ISBN 0751300497
Cacti and Succulents, Paul Hamlyn, ISBN –

  1. Astrophytum ornatum
  2. Astrophytum myriostigma
  3. Astrophytum coahuilense
  4. Astrophytum capricorne

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