Grusonia F. Reichenbach ex Britton & Rose (1919)

named to honor of Hermann Gruson (1821–1895)
short-cylindrical, forming mats, segments short lie on top of each other
ribs 8–10, continuous
spines only a few, thin
glochids only at the new growth and at the flower
spine sheath reduced
flowers only at the end of a segment

Highslide JS
 

Distribution

southwest of the USA
north and northwest of Mexico inclusive Baja California
hot arid areas

Growth period

full sunny and hot location
the species of this genus are sensitive to too much moisture
watering only at sunny weather and after the soil is complete dried
keep the root neck dry

Winter period

bright and complete dry at 4–10°C (39–50°F)
species of the Baja California somewhat warmer during the winter rest

Soil-mixture

complete minerally and very permeable to water with a good dainage
   
Grusonia invicta (Brandegee) E. F. Anderson (1999)
 
Highslide JS   Highslide JS   Highslide JS
         
Highslide JS   Highslide JS   Highslide JS
         

Habitat

Mexico
central Baja California

Description

strongly forming clusters, stems relatively long and thick, dark green,
tubercles to 1.6 in (4 cm) long
areoles white
glochids white, only rarely existing
6–10 radial spines
10–12 central spines, to 1.4 in (3.5 cm) long, four-edged, at the base carmine red,
tips brown, in age gray
flowers 2 in (5 cm) Ø, ovary with reddish spines
fruits ovate, moderate fleshy, 1.6–2 in (4–5 cm) long, 1–1.2 in (2.5–3 cm) Ø,
strong spiny

Flowering time

April–May in habitat

Synonyms

Opuntia invicta Brandegee (1889)
Corynopuntia invicta (Brandegee) F. M. Knuth (1936)
CITES Appendix II
 
Description of "Kakteen von A bis Z" by Walter Haage with courtesy by Kakteen-Haage made available.
Pictures of the collection by Donna and Robert Ellis; Tucson, Arizona

 

 

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