Lophocereus schottii

Lophocereus schottii
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Cactaceae
Subfamily:	Cactoideae
Genus:	Lophocereus
Species:	L. schottii
Binomial name
Lophocereus schottii ( Engelm.) Britton & Rose[2]
Synonyms[2]
Cereus mieckleyanus Weing. Cereus palmeri F.A.C.Weber Cereus sargentianus Orcutt Cereus schottii Engelm. Lemaireocereus mieckleyanus (Weing.) Borg Lophocereus australis Britton & Rose Lophocereus mieckleyanus (Weing.) Backeb. Lophocereus sargentianus (Orcutt) Britton & Rose Pachycereus schottii (Engelm.) D.R.Hunt Pilocereus sargentianus Orcutt ex K.Schum. Pilocereus schottii (Engelm.) Lem.

Lophocereus schottii, the senita cactus,^[3] is a species of cactus from southern Arizona and north-western Mexico, particularly Baja California and Sonora. Ultramafic soils facilitate the endemism of plant species and are often associated with their distribution.^[4]

Description

Lophocereus schottii grows tree-shaped to shrub-like with yellow-green, more or less upright shoots, which often develop into thickets with more than 100 shoots. It reaches heights of 1 to 3 meters and shoot diameters of 5 to 10 centimeters. A tribe is rarely formed. There are 4 to 13 clearly defined ribs. The 1 to 3 strong, gray central spines are 1 to 3 centimeters long. The 3 to 5 marginal spines are gray and 0.5 to 1.5 centimeters long. The terminal pseudocephalium consists of bristly, flexible, gray spines. It occasionally grows to be more than 100 centimeters long.

The funnel-shaped flowers appear laterally from the pseudocephalium and open at night. They are white to deep pink, up to 5 centimeters long and reach a diameter of 3 centimeters. Its pericarpel and flower tube are covered with scales and hairs. The spherical, red fruits contain red pulp and reach a diameter of 1 to 3 centimeters. They are edible, but are rarely used as food.^[5]

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  Top of branch
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  Pachycereus schotti monstrosus
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  Pachycereus schottii f. monstrosa

Distribution

The distribution area of Lophocereus schottii extends from the south of the US state of Arizona to the northwest of Mexico and includes the states of Baja California and Sonora. The species grows at altitudes from 0 to 800 meters.

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  Plants growing in La Paz, Baja California Sur
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  Plant growing in Viscaino, Baja California Sur
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  Plants growing in La Paz, Baja California Sur

Ecology

The senita cactus exhibits mutualism with the senita moth. The senita moth is the only nocturnal pollinator of the cactus, and the moth relies on the cactus as a host for reproduction.^[6]

Taxonomy

The first description as Cereus schottii was made in 1856 by George Engelmann.^[7] The specific epithet schottii honors the German naturalist and plant collector Arthur Schott, who was involved in surveying the border between the United States and Mexico. Nathaniel Lord Britton and Joseph Nelson Rose placed the species in the genus Lemaireocereus in 1909. Further nomenclature synonyms are Pilocereus schottii (Engelm.) Lem. (1862) and Pachycereus schottii (Engelm.) D.R.Hunt (1987).^[7]

References