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 reflexispina (Wiggins & Rollins) E. F. Anderson (1999)
 
Highslide JS   Highslide JS    
         

Habitat

Mexico
Sonora

Description

flat, moderate branched, clumps 11.8–39.4 in (30–100 cm) Ø
and 7.9–15.7 in (20–40 cm) high, with erect candelabra-like stems
segments cylindrical to wide globular, light yellowish-green,
bare, 2–3.9 in (5–10 cm) long, 8–15 mm Ø, with broad tubercles
areoles circular to elliptical, with white wool and twisted soon losing hairs
glochids numerous at the areoles, yellow, 1–7 mm long
major spines 2–5, broad subulate, flattened, rough, thickened at the base,
upper major spines 1, protruding, gray, 6–10 mm,
lower major spines gray to almost white, backward bended, fine, 8–15 mm
radial spines ± 10, acicular to flattened, 4–6 mm
several flowers at the end of a stem, 1.6–2.4 in (4–6 cm) long, greenish to yellow
fruits dry, greenish

Synonyms

Opuntia reflexispina Wiggins & Rollins (1943)
Corynopuntia reflexispina (Wiggins & Rollins) Backeberg (1958)
CITES Appendix II
 
 
Pictures of the collection by Donna and Robert Ellis; Tucson, Arizona

 

 

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