Occurrence ID (GUID):
Ferocactus wislizeni (Engelm.) Britt. & Rose
Determiner: Wm. D. Peachey (1994-09-22)
Show Determination History
Wm. D. Peachey s.n.
Verbatim Date: September,22,1994
United States, Arizona, Pima County, Southwest flank of the San Luis Mountains SSW of Arivaca, Arizona on the east side of the Altar Valley and toward its southern end. The site is about 0.5 miles SSE of the San Luis Mine in an area of low relief gullies that drain to the SSW. The area's north slopes are spotted by junipers but the dominant perennial is mesquite.
T21S R9E S34 NW1/4 of the NE1/4
The recording of this cactus is due to the observation of it during a winter trip to the area in 1989 by Tim Rick and Dave Ward, then both of Tucson, Arizona. At that time a color print of the standing cactus was taken by Dave Ward with Tim Ward used as scale (SEE the B&W print-it is from a 4X5 copy negative made from the original color print). Subsequently, Tom Bethard and Bill Peachey of Tucson were accompanied by Dave Ward on 15 August 1993 in an effort to recover the location and document the cactus.
Corrections 15 December 1994; During the search for the cactus it was noted that nearly the entire local population of barrel cacti was in bloom. Several cacti in the range from 7 feet to 9 feet in height were encountered and measured before the cactus in question was found. A notable attribute of these tall plants is that they all exhibit a nearly vertical growth habit. This was especially eye-catching in that most are growing upon moderate slopes due to the nature of the topography. A prolonged search effort was, in part, due to the fact that the largest plant had toppled. It was found intact but had fallen perpendicular to the axis of the local gully. Its apical meristem wsa pointing perfectly downslope and its roots were entirely severed. The local gully systems are incised into mineral bearing Laramide felsic granites that erode into clay-rich 'grus'. Evidently the root structure had failed during the saturated soil conditions that had pervailed during the exceptionally heavy rains of January and Febuary 1993
Record Id: 87e3a8d3-7a6c-4956-b898-0bc18ce2ba83
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