Arctostaphylos rainbowensis

J. E. Keeley & Massihi

Madroño 41: 2, fig. 1. 1994 ,.

Common names: Rainbow manzanita
EndemicConservation concern
Treatment appears in FNA Volume 8. Treatment on page 422. Mentioned on page 409.

Shrubs, erect, 1–4 m; burl present; twigs minutely glandular-hairy. Leaves: petiole 6–12 mm; blade light green to weakly glaucous or glaucous, dull, elliptic-ovate, 3.5–5 × 2–3.5 cm, base rounded, margins entire, plane, surfaces smooth, glabrous. Inflorescences panicles, 4–10-branched; immature inflorescence pendent, axis 2–3 cm, 1+ mm diam., glabrous; bracts appressed, scalelike, deltate to awl-like, 2–4 mm, apex acute, surfaces glabrous. Pedicels 5–10 mm, glabrous. Flowers: corolla white, conic to urceolate; ovary glabrous. Fruits globose, 8–12 mm diam., glabrous. Stones connate into single sphere. 2n = 26.


Phenology: Flowering winter–early spring.
Habitat: Chaparral of granite uplands
Elevation: 500-700 m

Discussion

Of conservation concern.

Arctostaphylos rainbowensis is found in a coastal portion of the Peninsular Range in northern San Diego and adjacent Riverside counties.

Selected References

None.

Lower Taxa

None.

"entire" is not a number.

V. Thomas Parker +, Michael C. Vasey +  and Jon E. Keeley +
J. E. Keeley & Massihi +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
not furrowed +
gray +  and reddish +
persistent +
exfoliating +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
plane;rounded;elliptic-ovate +
2cm;3.5cm +
light green +
ovate;elliptic +
coriaceous +
not imbricate +  and imbricate +
hue +, light-brown +  and tan +
persistent +
deltate +  and awl-like +
Rainbow manzanita +
rotate to crateriform campanulate cylindric globose or urceolate +
brown +, reddish-brown +  and red +
depressed-globose +  and globose +
500-700 m +
undifferentiated +
fusiform +
stonelike +
indehiscent +
globose +
Chaparral of granite uplands +
multicellular +
opposite +, whorled +  and alternate +
pubescence +  and color +
persistent +
3.5cm;5cm +
plane;rounded;elliptic-ovate +
2cm;3.5cm +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
reduced +
not sticky +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering winter–early spring. +
4-5-carpellate +
not +  and connate +
connate +  and distinct +
globose +
persistent +
distinct +
ovate +  and deltate +
Endemic +  and Conservation concern +
prostrate +  and erect +
peltate +  and capitate +
straight +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
glabrous +  and glaucous +
plane +, rounded +  and elliptic-ovate +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Undefined tribe Arbuteae +
Arctostaphylos rainbowensis +
Arctostaphylos +
species +
glandular-hairy +
achlorophyllous +  and chlorophyllous +
evergreen +, deciduous +  and perennial +
heterotrophic +, autotrophic +  and mycotrophic +