Ornithostaphylos oppositifolia

(Parry) Small in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 29: 101. 1914,.

Illustrated
Basionyms: Arctostaphylos oppositifolia Parry Proc. Davenport Acad. Nat. Sci. 4: 36. 1884
Treatment appears in FNA Volume 8. Treatment on page 403.

Shrubs to 2 (–5) m. Leaves usually 3 (–5) per node; petiole to 6 mm; blade whitish abaxially, light to deep green adaxially, 2.5–8 cm × 3–6 mm, base tapering to petiole, apex acute to mucronate. Inflorescences: axes sometimes reddish purple, minutely tomentose. Pedicels slender, much longer than flowers; bracteoles minute. Flowers: calyx lobes ca. 1 × 1 mm, apex obtuse; corolla 3–4 mm, lobes recurved, apex obtuse; anther awns nearly as long as sacs; ovary villous; style often persistent, included or slightly exserted. Drupes 4–6 mm diam.


Phenology: Flowering Jan–Apr; fruiting May–Aug.
Habitat: Coastal chaparral
Elevation: 100-800 m

Distribution

V8 760-distribution-map.gif

Calif., nw Mexico (n Baja California)

Discussion

Ornithostaphylos oppositifolia is known in the United States from a single mesa and adjacent slopes in the Tijuana Hills just north of the international border with Mexico in San Diego County. Only 103 individuals have been located on the United States side of the border, and the species is listed as endangered under the California Endangered Species Act. The population has been declining due to habitat fragmentation by roads and trails and disturbance caused by illegal border crossings and Border Patrol activities, including “brush” clearing. Recently, the extensive disturbance caused by the building of a double border fence has dramatically affected the population, and its long-term survival is uncertain.

Selected References

None.

Lower Taxa

None.

"/3" is not declared as a valid unit of measurement for this property. "/4" is not declared as a valid unit of measurement for this property.

Obtuse (?) +, Acute (?) +  and Mucronate (?) +
George M. Diggs Jr. +
(Parry) Small in N. L. Britton et al. +
reddish purple +
not furrowed +
reddish purple +
tapering +
Arctostaphylos oppositifolia +
light +  and deep green +
2.5 cm25 mm <br />0.025 m <br /> (8 cm80 mm <br />0.08 m <br />) +
linear;linear-oblong or narrowly lanceolate +
coriaceous +
3mm;6mm +
1 cm10 mm <br />0.01 m <br /> (?) +
1 cm10 mm <br />0.01 m <br /> (?) +
rotate to crateriform campanulate cylindric globose or urceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Calif. +  and nw Mexico (n Baja California) +
reddish-brown +  and brown +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
nearly +  and globose +
100-800 m +
undifferentiated +
fusiform +
indehiscent +
Coastal chaparral +
multicellular +
whorled +  and opposite +
persistent +
revolute;plane;toothed;entire;revolute;plane;toothed;entire +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
reduced +
not sticky +
0 cm0 mm <br />0 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Flowering Jan–Apr +  and fruiting May–Aug. +
4-5-carpellate +
in N. L. Britton et al., N. Amer. Fl. +
connate +
globose +
persistent +
0 +  and 1/2 +
triangular +
Illustrated +
peltate +  and capitate +
straight +
persistent +
exserted +  and included +
Undefined tribe Arbuteae +
Ornithostaphylos oppositifolia +
Ornithostaphylos +
species +
achlorophyllous +  and chlorophyllous +
evergreen +, deciduous +  and perennial +
heterotrophic +, autotrophic +  and mycotrophic +