Hamatocactus sinuatus var. papyracanthus
Central spines are hooked or almost twist into ringlets.
Solitary, or sparsely clumping.
Stems: Spheric to ovoid, dark green 10-30 × 7.5-20 cm.
Ribs: Typically 13 ( to 17), undulate to deeply crenate,
Areoles: 1-3 cm apart , young ones with yellow felt.
Spines: 12-16 per areole; Central spines 4 per areole, apically
or almost twist into ringlets,
principal central spine flattened, 5-10 cm × 1.3-3 mm, ± papery.
Flowers: Pale yellow 6-7.5 × 7-9 cm; stigma lobes 8-10.
Fruits: Green, yellow-green, or olive, 20-25 × 10-15 mm.
Seeds: ca. 1 mm.
Blooming season: Early summer to autumn
Seedlings start flowering at the age of 4-6 years.
Cultivation: This species is easy and
well worth growing. Require little care once they have
reached a nice flowering size. H. papyracanthus is suited for any
rich, well drained soil in full sun throughout the year
(But do better with some light shade in summer). Pot
culture: grow best in a well-drained container filled with a
porous cactus soil mixture that doesn't contain too much humus. To
insure robust plants water and fertilize during the aestival growth
cycle, this plant need plenty of water (indicatively to about once a
week) But needs to be avoided wetting the bodies of these plants while
they are in sunlight. A wet cactus in the sun light can cause sun
burning which can lead to scares or even fungal infections and death.
Care must be taken to prevent
mould forming on the sugary
secretions from near the
Frost Tolerance: In winter keep completely dry at
5°C this usually aids in maintaining a healthier plant, but
it is hardy to -7°C.
Reproduction: Seeds or cutting.
Seeds are the typical way of reproducing. These cacti will
easily grow from seeds and some from cuttings. Seeds can be sown in the
spring or summer in well-drained pots of soil for cacti and sow the
seeds thinly on top. Cover them with a bit of fine quartz grit. Moisten
and lay a piece of glass across the top. The pots should be set in a
warm greenhouse until they start to sprout after which the glass should
be progressively removed so they can receive full light and air. It
isn't good to keep the glass over the seedlings. The seedlings well
developed can be planted separately in small pots.
Cuttings made from pieces of the stem of any size can be detached and
laid aside for a few days to allow a protective "skin" to form over the
cut. They can then be planted in pots. Place them in a spot where
they'll receive sun and do not water until the soil becomes fairly dry.
After a while the soil can be moistened regularly but never kept
Photo of conspecific taxa, varieties, forms and cultivars of
plants belonging to the Ferocactus hamatacanthus (H.
Taxon has lots of
synonyms whit several controversial varieties and subspecies:
hamatacanthus var. sinuatus (A.Dietr.) L.Benson,
In: Cact. Succ. J. (Los Angeles). 41: 128. 1969.
Common Name: Yellow
Conservation status: Listed in
CITES Appendix II
- Echinocactus sinuatus
In: Allg. Gartenzeitung 19: 345. 1851
sinuatus var. papyracanthus
hamatacanthus v sinuatus f papyracanthus