Espostoa Britton & Rose (1929)

(Binghamia, Pseudoespostoa, Thrixanthocereus, Vatricania)
named after Nicolas E. Esposto
Peruvian botanist on the Escuela Nacional de Agricultura in Lima

columnar cactus, dendriform to bushy, somewhat branched like candelabra, usually dense white hairy
hairs silky, like cobwebs around the plants, on the apex not soft and dense
on the stem end is an cephalium with whiteish, yellowish or brownish hairs
spines short, thin, white, yellowish or red
flowers about 2 in (5 cm) long, whiteish, open nights, appears on the cephalium
fruits berry-shaped, red, sparse hairy; seeds dull black

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Distribution

south America - Ecuador, Peru, Bolivia
steppes and mountains

Growth period

many warmness and full sun
only moderate watering, only at warm weather, moisture at cold weather is dangerous
not watering from above, therewith the hairs stay clean
occasionally spraying with water is to recommend in the evening
to keep the plants clean, is cultivating in a greenhouse recommendable
in midsummer keep the plant dry for a growth rest, main growth period is in spring and fall

Winter period

absolutly dry at 50–57°F (10–14°C), as possible not colder than 50°F (10°C)

Soil-mixture

minerally, nutritious and permeable to water
with addition of quartz gravel
   
Espostoa guentheri (Kupper) Eggli (2005)
 
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Habitat

Bolivia
Cochabamba, Santa Cruz, Chuquisaca - in the valley of Rio Grande,
at El Oro in 2600–3600 ft (800–1100 m) altitude

Description

named after Ernesto Guenther, Valparaiso
columnar cactus, to 6.5 ft (2 m) tall, branching at the base, about 3.9 in (10 cm) Ø, light green
ribs to 27, with slightly tubercles, above the areoles unclear askew furrowed
areoles yellowish-white, felted
young 15, later to 25 spines, to 0.6 in (1.5 cm) lo
ng
1 central spine, to 0.9 in (2.2 cm) long
cephalium at the top, reddish-yellow to strong foxy red,
with to 2.4 in (6 cm) long bristles, on the areoles to 1.6 in (4 cm) long, with yellowish-white wool
flowers to 3.2 in (8 cm) long, 1.2 in (3 cm) Ø, self sterile, only for 1 night open, yellowish-white,
pericarpel and ovary covered with pink silky wool

Synonyms

Cephalocereus guentheri W. Kupper (1931)
Vatricania guentheri
(W. Kupper) C. Backeberg (1951)

CITES

Appendix II
 
Description of "Kakteen von A bis Z" by Walter Haage with courtesy by Kakteen-Haage made available.
Picture 1 and 2 with courtesy of the Botanical Garden of the University of Heidelberg, Germany made available.
Picture 3 to 5 with courtesy of © Copyright Immanuel Voigt, Jena; Manus-flora made available.

 

 

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