Greenleaf Manzanita - Arctostaphylos patula
Other Names:
Arctostaphylos x media
Species of Concern
Global Rank:
G4
State Rank:
S1
* (see State Rank Reason below)
Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
1
External Links
State Rank Reason (see State Rank above)
Known from two or three seperate locations in Montana. Population sizes are very small and are susceptible to the negative effects associated with such. Additional negative impacts from timber harvesting, invasive weeds and development are possible.
Primarily a species of the Great Basin and California, and disjunct in Montana. Not known from either Idaho or Wyoming.
- Details on Status Ranking and Review
Greenleaf Manzanita (Arctostaphylos patula) Conservation Status Review
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General Description
Green-leaf Manzanita is a shrub with reddish brown, spreading stems which are up to 1 m (3 ft) high and can propagate by layering. The alternate, yellow-green leaves have broadly elliptic blades which are 2-5 cm long with entire margins and petioles less than 1/2 as long. Foliage is sparsely covered with short hairs and yellow glands. Short-stalked, pink flowers are clustered in branched inflorescences on the stem tips. The urn-shaped corolla, which is ca. 6 mm long, has 5 short lobes, and the calyx has 5 nearly separate sepals. There are 10 stamens. The brownish, glabrous berry is 7-10 mm across.
Phenology
Flowering in late May-early June, fruiting in August.
Diagnostic Characteristics
This is the only Arctostaphylos species with a bush-stature in our area; distinguished from other bush-forming genera in the Health Family by the fruit which is free of, and not enclosed by, the calyx, alternate leaves, 5-part flowers, and corolla length less than 1 cm. A. uva-ursi has trailing stems that rarely are over 0.2 m tall. Hybrids between these two species are known elsewhere in their range.
General Distribution
Distribution Comments
South-central WA to CA, east to AZ, NV and northwest MT. Disjunct.
Summary of Observations Submitted for Montana
Number of Observations: 7
Number of Occurrences: 4
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Relative Density
Recency
(Records associated with a range of dates are excluded from time charts)
Habitat
Rocky soil in open coniferous forests in the montane zone.
Ecological Systems Associated with this Species
References
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Ball C. T., J. Keeley, H. Mooney, J. Seemann, and W. Winner. 1983. Relationship between form, function, and distribution of two ARCTOSTAPHYLOS species (Ericaceae) and their putative hybrids. Acta Oecologica 4:153-164.- Diggs, G. M., D. Soltis, and P. Soltis. 1988. Hybridization and genetic variation in ARCTOSTAPHYLOS (Ericaceae). American J. of Bot. 75(6):169.
- Ellstrand, N. C., J. M. Lee, J. E. Keeley, and S. C Keeley. 1987. Ecological isolation and introgression: biochemical confirmation of introgression in an ARCTOSTAPHYLOS (Ericaceae) population. Acta Oecologica 8:299-308.
- Lesica, P. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX.
- Lesica, P. and P. V. Wells. 1986. Noteworthy collection: Montana. Madrono 33:227-228.
- Schierenbeck, K. A. 1988. Evolutionary relationships among ARCTOSTAPHYLOS MEWUKKA and associated species. American J. Bot. 75(6):204.
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