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 emoryi (Engelmann) Pinkava (1999)
 
Habitat - Graham County, Arizona,
USA
       
Highslide JS   Highslide JS    
         

Habitat

USA
Arizona, New Mexico, Texas
Mexico
Chihuahua
on sandy or gravelly desert flats, washes, hills
in 2300–3940 ft (700–1200 m) altitude

Description

flat, forming mats, 5.9–11.8 in (15–30 cm) high
stem segments curved-clavate, gradually to abruptly narrowed at the base,
2.8–7.5 in (7–19 cm) long, 1–2 in (2,5–5 cm) Ø, with very prominet tubercles, 0.8–2 in (2–5 cm) long
areoles circular, with white to gray wool
glochids yellow to brown, 5–7 mm long
spines constant distributed or only on the areoles near the end of a segment,
yellow, reddish-brown or ochery, spreaded
upper major spines 3–5, or sometimes only 1, ascending-divergent,
angular-flattened to subterete,
lower major spines 3–5, spreaded, angular-flattened, sharp-edged
flowers yellow, 0.8–1.4 in (2–3 cm) long
fruits cylindrical to ellipsoid, yellow, fleshy, 1.6–3.5 in (4–9 cm) long,
0.6–1.6 in (1,4–4 cm) Ø, spineless but usually densely yellow glochids

Flowering time

May–June in habitat

Synonyms

Opuntia emoryi Engelmann (1856)
Cactus emoryi (Engelmann) Lemaire (1868)
CITES Appendix II
 
 
Pictures with courtesy by © John Durham, Tucson, Arizona made available.

 

 

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