Acharagma roseanum

Acharagma roseanum is a succulent cactus native to a small area of mountains of southeastern Coahuila and Nuevo León, Mexico. It grows on rocky limestone hills and xerophytic shrubland.^[1] Its name is often misspelled as "Roseana".^[2]

Acharagma roseanum
Conservation status
Vulnerable  (IUCN 3.1)[1]
CITES Appendix II (CITES)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Cactaceae
Subfamily:	Cactoideae
Genus:	Acharagma
Species:	A. roseanum
Binomial name
Acharagma roseanum (Boed.) E.F.Anderson
Synonyms
Coryphantha roseana (Boed.) R.Moran Echinocactus roseanus Boed. Escobaria roseana (Boed.) Buxb. Gymnocactus roseanus (Boed.) Glass & R.A.Foster Neolloydia roseana (Boed.) F.M.Knuth in Backeb. & F.M.Knuth Thelocactus roseanus (Boed.) Borg

Description

Acharagma roseanum forms individual, small, soft bodied cacti that form clusters over time.^[2] The plant's specific physical characteristics are: The stem is 4–6 cm (1.6–2.4 in) tall, 1.5–5 cm (0.59–1.97 in) wide with spines that are white-yellow to gold color. The warts stand in rows and are up to 0.3 centimeters long. The 4 to 6 yellow central spines are very similar to the marginal spines or are slightly curved and are 1 to 2 centimeters long. The 15 to 30 marginal spines are yellowish to brownish and 0.8 to 1.5 centimeters long. The flowers are pink to bronze with a dark reddish central stripe or cream flowers on the top of the stem, 1.5–2 cm (0.59–0.79 in) in diameter.^[3]

Subspecies

Image	Name	Description	Distribution
	Acharagma roseanum subsp. galeanense (Haugg) D.R.Hunt	It was first described in 1995 as Escobaria roseana subsp. galeanensis by Erich Haugg. David Richard Hunt introduced the species as a subspecies of Acharagma roseanum in 2002. The subspecies has a cylindrical body up to 6 centimeters high, the central thorns are indistinguishable from the marginal thorns, the number of thorns is 30 in total, cream-colored flowers up to 1.5 centimeters long.	Mexico (Coahuila)
	Acharagma roseanum subsp. roseanum	The nominate form has an ovoid body up to 4 centimeters high, 4 to 6 central thorns, about 15 marginal thorns, pink flowers up to 2 centimeters long.	Mexico (Nuevo León)

Distribution

Acharagma roseanum is widespread in the Mexican states of Coahuila, Nuevo León and San Luis Potosí.

Taxonomy

The first description was made in 1928 as Echinocactus roseanus by Friedrich Bödeker.^[4] The specific epithet roseanum honors the American botanist Joseph Nelson Rose. Edward Frederick Anderson placed the species in the genus Acharagma in 1999.

Synonyms are the following described species: Echinocactus roseanus Boed. (1928), Neoloydia roseanus (Boed.) F.M.Knuth (1936), Thelocactus roseanus (Boed.) W.T.Marshall (1941), Escobaria roseana (Boed.) Buxb. (1951), Coryphantha roseana (Boed.) Moran (1953) and Gymnocactus roseanus (Boed.) Glas & R.A.Foster (1970).