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SPECIES: Tetradymia spinosa
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Photo ©Christopher Christie. | Photo courtesy of Las Pilitas Nursery. |
Tetradymia spinosa var. spinosa
Tetradymia spinosa var. longispina M. E. Jones
LIFE FORM:
Shrub
FEDERAL LEGAL STATUS:
No special status
OTHER STATUS:
No entry
CA | CO | ID | MT | NM | NV | OR | UT | WY |
Breeding system: Shortspine horsebrush may often be self-fertilized by individuals within a colony connected by rhizomes [53].
Pollination: Horsebrushes are pollinated by insect generalists including flies, moths, bees, and beetles [35].
Seed dispersal: Horsebrush seeds are wind dispersed [64]. The hairs on horsebrush pappi aid dispersal [20].
Seedling establishment/growth: Seedling establishment is rare in horsebrushes, probably due to harsh environments [53]. Shortspine horsebrush seedlings were observed on a prescribed burned site in southeastern Oregon [62].
Asexual regeneration: Shortspine horsebrush forms small colonies from rhizomes, which may extend 1 foot (30 cm) from the parent plant [37,53]. It also sprouts from the root crown [41,61].
SITE CHARACTERISTICS:Shortspine horsebrush generally occurs from 2,600 to 6,600 feet (800-2,000 m) elevation, although it is rarely found as high as 8,900 feet (2,700 m) [16]. Elevational ranges by state are:
CA | 2,600-7,900 feet (800-2,400 m) [24,27] |
CO | 4,500-7,000 feet (1,400-2,100) [26] |
UT | 1,400-6,300 feet (1,250-1,925 m) [60] |
Climate on shortspine horsebrush sites is often harsh, with hot summers and cool to cold winters. A Nevada ephedra-shortspine horsebrush site in the Owens Valley of California showed a mean weekly maximum summer temperature of 104 oFahrenheit (40 oC), 0.9 inch (240 mm) total summer precipitation, and mean total windspeed of 62.1 miles/day (99.9 km/day) [13].
SUCCESSIONAL STATUS:Fire regimes: Fires in the desert shrub ecosystems in which shortspine horsebrush occurs were historically infrequent and stand replacing. Shortspine horsebrush is most common on dry sites with sparse vegetation cover [7,10], and fires are rare on shortspine horsebrush-dominated sites due to sparse fuels [41,42]. Fires in the pinyon-juniper types with a shortspine horsebrush component were of mixed severity [42].
The following table provides fire return interval for plant communities and ecosystems with shortspine horsebrush. Find further fire regime information for the plant communities in which this species may occur by entering the species name in the FEIS home page under "Find Fire Regimes".
Community or Ecosystem | Dominant Species | Fire Return Interval Range (years) |
sagebrush steppe | Artemisia tridentata/Pseudoroegneria spicata | 20-70 [42] |
basin big sagebrush | Artemisia tridentata var. tridentata | 12-43 [48] |
mountain big sagebrush | Artemisia tridentata var. vaseyana | 15-40 [1,11,36] |
Wyoming big sagebrush | Artemisia tridentata var. wyomingensis | 10-70 (40**) [57,63] |
saltbush-greasewood | Atriplex confertifolia-Sarcobatus vermiculatus | < 35 to < 100 |
western juniper | Juniperus occidentalis | 20-70 |
Rocky Mountain juniper | Juniperus scopulorum | < 35 |
pinyon-juniper | Pinus-Juniperus spp. | < 35 [42] |
CO | MT | UT | WY | |
cattle | ---- | poor | poor | poor |
domestic sheep | ---- | poor | fair | poor |
horses | ---- | poor | poor | poor |
pronghorn | ---- | ---- | poor | ---- |
elk | poor | ---- | poor | ---- |
mule deer | poor | ---- | poor | ---- |
small mammals | ---- | ---- | fair | ---- |
small nongame birds | ---- | ---- | fair | ---- |
upland game birds | ---- | ---- | poor | ---- |
waterfowl | ---- | ---- | poor | ---- |
Nutritional value: Mean nutritional content of shortspine horsebrush browse is as follows [39]:
Nutrient | % |
ash | 5.4 |
crude fiber | 36.8 |
ether extract | 6.3 |
N-free extract | 42.8 |
Protein (N × 6.25) | 8.7 |
cattle (digestible protein) | 5.3 |
domestic goats (digestible protein) | 4.7 |
horses (digestible protein) | 4.9 |
domestic rabbits (digestible protein) | 5.4 |
domestic sheep (digestible protein) | 5.1 |
calcium | 0.94 |
phosphorus | 0.25 |
Cover value: Shortspine horsebrush provides cover for small animals [34].
VALUE FOR REHABILITATION OF DISTURBED SITES:1. Arno, Stephen F.; Gruell, George E. 1983. Fire history at the forest-grassland ecotone in southwestern Montana. Journal of Range Management. 36(3): 332-336. [342]
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6. Blackburn, Wilbert H.; Tueller, Paul T.; Eckert, Richard E., Jr. 1969. Vegetation and soils of the Churchill Canyon Watershed. R-45. Reno, NV: University of Nevada, Agricultural Experiment Station. 155 p. In cooperation with: U.S. Department of the Interior, Bureau of Land Management. [460]
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