The DBG has seeds and plants from five populations in southern Arizona. Desert Botanical Garden salvaged approximately 75 plants and clones from a proposed site in the Green Valley housing development. Available fruits and seeds were salvaged at the same time. Since 1993, the Garden has produced approximately 300 seeds in cultivation through controlled cross-pollination.

The DBG has seeds and plants from five populations in southern Arizona.

Since 1993, the Garden has produced approximately 300 seeds in cultivation through controlled cross-pollination.

The DBG has seeds and plants from five populations in southern Arizona. Desert Botanical Garden salvaged approximately 75 plants and clones from a proposed site in the Green Valley housing development. Available fruits and seeds were salvaged at the same time. Since 1993, the Garden has produced approximately 300 seeds in cultivation through controlled cross-pollination.

A germination test was conducted on field-collected seeds from the original collection, yielding a percentage of 35%. Tests were conducted in the greenhouse, with temperatures ranging from 70-100 F, using Steve Brack's 'box' method, whereby pots are placed in a plywood box covered with window screen and misted twice daily. Plants in greenhouse cultivation are repeatedly infested with spider mites, and must be grown outdoors with some protection from the west sun. Plants were translocated from the ground to pots during a construction project in May 2000. As of December 200, no casualties have been observed. The DBG has seeds and plants from five populations in southern Arizona.

Most sources estimate that there are few remaining populations. Many known sites apparently have few individuals, and few populations are protected. Total population is difficult to estimate, as plants are very sparsely distributed and difficult to locate in the field. The range has been delimited by relatively thorough survey, and is bounded by the Santa Rita mountains (east), the Baboquivari mountains (west), and Tucson (north) in Arizona; it extends south a short distance into Sonora, Mexico. Total range is approximately 70 km east-west by 80 km north-south, although there are large areas of unsuitable habitat within these boundaries. The plant is known to be declining; loss of habitat due to urban development is the primary threat. Losses of habitat due to road construction, agriculture, mining, and off-road vehicle use are also important threats, as is habitat degradation due to livestock grazing and non-native grass invasion. Illegal collection of plants also occurs.

Urban development is the primary threat, as the majority of C. scheeri v. robustispina. Additional impacts include road construction, agriculture, mining, off-road vehicle use, grazing, and introduction of non-native grasses (USFWS 1981, Mills 1991, Toll

Approximately 21 populations are known (USFWS 1981).

Desert Botanical Garden salvaged approximately 75 plants and clones from a proposed site in the Green Valley housing development. Available fruits and seeds were salvaged at the same time. Since 1993, the Garden has produced approximately 300 seeds in cultivation through controlled cross-pollination. Permanent plots have been erected to study the demographic component of this species (Schmalzel and Dix 1998).

A formal management plan has not been designed.

Studies into the aspects of this species' biology and ecology would be useful in conservation efforts.

A germination test was conducted on field-collected seeds from the original collection, yielding a percentage of 35%. Tests were conducted in the greenhouse, with temperatures ranging from 70-100 F, using Steve Brack's 'box' method, whereby pots are placed in a plywood box covered with window screen and misted twice daily. Plants in greenhouse cultivation are repeatedly infested with spider mites, and must be grown outdoors with some protection from the west sun. Plants were translocated from the ground to pots during a construction project in May 2000. As of December 200, no casualties have been observed. The DBG has seeds and plants from five populations in southern Arizona.