Purshia glandulosa
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Purshia glandulosa |
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| Purshia glandulosa | ||||||||||||
| Curran |
Purshia glandulosa is a species of the genus Purshia within the rose family (Rosaceae). The TNC classifies the species as "not endangered" ("G5"). CommonEnglish names are desert bitterbrush and Mojave antelope brush.
description
Vegetative characteristics
Purshia glandulosa is an evergreen shrub that reaches heights of up to 4.5 meters, but which often remains smaller depending on the environmental conditions. It has a taproot that can reach a depth of almost 5 meters, an adaptation to the drought prevailing in its habitat .
Generative characteristics
The flowers are white. The flowering period extends - depending on the variety - from February to June.
ecology
At times the plant produces nodules that it can use to fix nitrogen .
Purshia glandulosa reproduces by seeding, sinking and sprouting from the root crown. It can also regenerate from bits of root that sprout several feet in the ground. Propagation by seeds is relatively rare because these seeds have a very low germination rate and they do not easily produce seedlings that are viable. The seeds have a very hard shell and germinate better if stratified . In addition, the plants do not even begin to produce seeds until they are around ten years old.
Occurrence
Purshia glandulosa is for the southwestern United States ( California , Arizona , southern Nevada and Utah ) endemic . Within this region it occurs in the Great Basin , the Mojave Desert and in the chaparral - shrub steppe - ecotone in the eastern Sierra Nevada , the Tehachapi Mountains , the Transverse Ranges and the Peninsular Ranges . Other populated habitats are pinyon a juniper forests, coniferous forests and Joshua tree areas.
Purshia glandulosa can colonize many types of soil , mainly well-aerated. It can also settle on extremely sparse layers of soil such as rock ledges and becomes a pioneer plant on eroded rocky habitats . It does not tolerate large amounts of water, especially in summer; it predominantly colonizes habitats with an annual rainfall of about 10 in (254 mm). Purshia glandulosa is fire tolerant ; it sprouts quickly from subsidence and rhizomes after the above-ground parts are burned. The varieties grow at different altitudes from 500 to 3500 meters.
Systematics
The species Purshia glandulosa originated as a hybrid between Purshia stansburyana and Purshia tridentata . It is sometimes thought to be a variety Purshia tridentata var. Glandulosa of Purshia tridentata . It can form hybrids again with both parent species.
use
The Navajo , Klamath , Paiute , Shoshonen and other indigenous tribes used Purshia glandulosa as a traditional medicinal herb .
The plant is a good feed for wild ungulates such as the pronghorn , but also for domestic animals. Since the leaves are not shed in their entirety, they are also available in winter.
Individual evidence
- ↑ a b c d e f Elena Zlatnik: Purshia glandulosa . In: Fire Effects Information System . USDA Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. 1999. Retrieved August 21, 2019.
- ↑ a b c d Purshia tridentata (Pursh) DC. var. glandulosa (Curran) ME Jones . In: Calflora . Retrieved August 21, 2019.
- ↑ Purshia glandulosa . USDA. Retrieved August 21, 2019.
- ↑ Purshia tridentata var. Glandulosa . In: Jepson Manual eFlora (TJM2) . Retrieved August 22, 2019.
- ^ Native American Ethnobotany of Purshia tridentata . In: Native American Ethnobotany DB . University of Michigan at Dearborn. Retrieved August 22, 2019.
