Manroot

Manroots
File:Marah fabaceus Seglea.jpg
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Cucurbitales Family: Cucurbitaceae Genus: Marah
Species
Marah fabaceus Marah gilensis Marah horridus Marah macrocarpus Marah oreganus Marah watsonii

The Manroots or Wild cucumbers (Marah spp.) are flowering plants in the gourd family Cucurbitaceae native to western North America. They are also commonly called Old man in the ground.

Characteristics

The manroots are perennial plants, growing from a large tuberous root. Most have stout, scabrous or hairy stems, with coiling tendrils that enable them to climb up other plants; they can also grow rapidly across level ground. Their leaves tend to have multiple lobes, up to 7 in some species. The fruits are striking and easily recognised. They are large, and spherical, oval or cylindrical. At a minimum they are 3 cm in diameter, but can be up to 20 cm long, and in many species they are covered in long spines. Both leaf and fruit shape vary widely between individual plants and leaves can be particularly variable even on the same vine.

The anthropomorphic common names "manroot" and "old man" derive from the swollen lobes and arm-like extensions of the unearthed tuber. On old plants, the tuber can be several meters long and weigh in excess of 100 kg.

The name "Marah" comes from a Hebrew word meaning "bitter" (cf. Ruth 1:20 [1]), and was given because all parts of these plants tend to have a bitter taste.

Distribution

Except for the isolated range of Marah gilensis in west-central Arizona, all other manroot species inhabit overlapping ranges distributed from Southern Canada to Northern Mexico. Although Coastal Manroot Marah oreganus extends inland into Idaho, all other manroot species, excluding M. gilensis, are confined to the states and province that immediately border the Pacific Ocean.

Taxonomy

Marah species hybridize freely where ranges overlap and this, in addition to intra-species leaf and fruit variability, makes definite identification of specimens a particular challenge.

Some authors include the man-roots in genus Echinocystis. Considered as a separate genus, however, it includes six or seven species, some of them with well-defined varieties within them.

Medicinal uses

Marah oreganus was used by the Native Americans for various problems. The Chinook made a poultice from the gourd. The Squaxin mashed the upper stalk in water to dip aching hands. The Chehalis burned the root and mixed the resulting powder with bear grease to apply to scrofula sores. The Coast Salish made a decoction to treat venereal disease, kidney trouble and scrofula sores.

Seeds of Marah fabaceus have been reported as being hallucinogenic. The tubers of M. fabaceus and M. macrocarpus contain saponins which can act as a natural soap but are toxic if ingested.

Like many medicinal plants, at least some Marah species are toxic and deaths have been reported from ingesting them.

Species in genus Marah

• California Manroot, Marah fabaceus
  • Marah fabaceus var. agrestis
  • Marah fabaceus var. fabaceus
• Gila Manroot, Marah gilensis
• Sierra Manroot, Marah horridus
• Cucamonga Manroot, Marah macrocarpus
  • Marah macrocarpus var. macrocarpus
  • Marah macrocarpus var. major
  • Marah macrocarpus var. micranthus
• Coastal Manroot Marah oreganus
• Taw Manroot Marah watsonii

External links

• Jepson manual treatment of genus Marah

• Website About 5 California-native Marah Species

References

• Gunther, Erna. Ethnobotany of Western Washington (Revised Edition). University of Washington Press. 1973
• Pojar, Jim and McKinnon, Andy. Plants of the Pacific Northwest Coast. Lone Pine Publishing. 1994.