[taxon report][distribution map][all photos][line drawing]
(Santa Fe cholla)
Scientific Name: Opuntia viridiflora Britton & Rose
Synonyms: Cylindropuntia viridiflora (Britton & Rose) Knuth; Opuntia imbricata Haworth var. viridiflora D. Weniger [comb. illeg.]; Opuntia whipplei var. viridiflora (Britton & Rose) L. Benson
Vernacular Name: Santa Fe cholla
R-E-D Code: 3-3-3
Description: Plants shrubby, much-branched to about 0.8 m in height and about 2 meters across; main stems with lateral "joints" primarily in whorls at ends of each year's growth, some of these elongating into secondary main stems; stems 1.5-2 cm thick; lateral joints about 10-15 cm long, readily detached; stems with about 8 rows of longitudinally elongate tubercles, each tubercle about 1.5-2 cm long and bearing an areole near the apical end; spines apically barbed, 2-8 per areole on young stems (often more on older stems), 2-2.5 cm long, mostly brownish, epidermis forming a pale-purplish, pinkish, or brownish loose sheath; flowers 2-2.5 cm in diameter, comparatively brownish-orange in the center with greenish peripheral tepals (varying to a purplish-brownish-red); fruits tuberculate, firm and leathery, not juicy, yellow when ripe, persistent, 1.5-2.5 cm in diameter; seeds covered in a hard pale-yellowish aril, discoid with a narrow not prominent rim, about 3 mm in diameter. Flowers in July.
Similar Species: Opuntia davisii is lower growing, has softer stems, yellow spine sheaths, tuberous roots, and green sterile flowers. Opuntia whipplei is typically lower growing, joints are rigidly attached, spine sheaths vary but are most often yellow or white, and flowers are yellow to yellow-green. Opuntia imbricata is larger, stems are thicker, joints are rigidly attached, and flowers are normally lavender-pink to rich magenta (rarely white).
Distribution: New Mexico, Santa Fe County.
Habitat: Gravelly rolling hills in piņon-juniper woodland; 1,770-2,200 m (5,800-7,200 ft).
Remarks: Despite this plant's name, the flowers are not very green. The Santa Fe cholla is known from only three areas between Santa Fe and Chimayo. It is often held that O. viridiflora is a hybrid derived from O. imbricata O. whipplei. All plants produce full crops of fertile seed which when germinated show individual variation, never toward any supposed parent, but rather well within the norm for O. viridiflora. Grossly similar plants of O. imbricata O. whipplei hybrid origin are known from areas where the species are sympatric, such as La Plata, Colorado; Thoreau, New Mexico; and the Petrified Forest National Monument, Arizona.
Conservation Considerations: Populations of this species are impacted by urban development and human activity. As with other opuntias, this species is subject to a fungal disease believed to be Gleosporium lunatum.
This plant is being grown at the Rio Grande Botanic Garden in Albuquerque for display, public education, research, and conservation of the wild populations.
Important Literature (*Illustration):
*New Mexico Native Plants Protection Advisory Committee. 1984. A handbook of rare and endemic plants of New Mexico. University of New Mexico Press, Albuquerque.
*Weniger, D. 1970. Cacti of the Southwest. University of Texas Press, Austin.
Information Compiled By:
David J. Ferguson, 1999; last updated 2014