Ceanothus fresnensis

Dudley ex Abrams

Bot. Gaz. 53: 68. 1912.

Common names: Fresno mat
EndemicConservation concern
Treatment appears in FNA Volume 12. Treatment on page 101. Mentioned on page 95, 100, 102, 104.

Shrubs, 0.1–0.3 m, matlike. Stems prostrate or spreading, rooting at proximal nodes; branchlets brown to reddish or grayish brown, rigid, tomentulose. Leaves not fascicled, sometimes crowded, not obscuring internodes; petiole 1–2 mm; blade flat or ± cupped, elliptic to oblanceolate, 4–12 × 3–8 mm, base obtuse to rounded, margins ± thick, not revolute, usually entire, sometimes minutely denticulate near apex, teeth 0–3, apex rounded to retuse, abaxial surface pale green, strigillose, adaxial surface dark green, shiny, puberulent, glabrescent. Inflorescences axillary, 1–2.3 cm. Flowers: sepals, petals, and nectary usually blue, rarely pale blue. Capsules 4–6 mm wide, weakly lobed; valves smooth, horns subapical, prominent, erect, intermediate ridges absent.


Phenology: Flowering May–Jun.
Habitat: Granitic soils and outcrops, semishaded sites, conifer forests.
Elevation: 400–2200 m.

Discussion

Ceanothus fresnensis occurs infrequently along the western slopes of the Sierra Nevada, from Nevada County south to Fresno County. Despite its similarity to C. arcuatus, the two species can be separated by differences in life form and intensity of flower color. Ceanothus fresnensis tends to occur in relatively dense forests, whereas C. arcuatus occurs in open, relatively exposed sites, often at higher elevations.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Ceanothus fresnensis"
glabrescent +  and puberulent +
perigynous +  and epigynous +
Rounded (?) +  and Retuse (?) +
Clifford L. Schmidt† +  and Dieter H. Wilken +
Dudley ex Abrams +
obtuse +  and rounded +
Ceanothus sect. Cerastes +
3-veined +  and veined +
not gland-dotted +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
more or less +  and flat +
elliptic;oblanceolate +
3mm;8mm +
not thorn-tipped +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Fresno mat +
400–2200 m. +
Granitic soils and outcrops, semishaded sites, conifer forests. +
subapical +
free +  and adnate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
unisexual +  and bisexual +
1 cm10 mm <br />0.01 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
deciduous +  and persistent +
denticulate +
pale blue;blue +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
adnate +  and distinct +
6 +  and 5 +
Clawed (?) +, Obovate (?) +  and Spatulate (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering May–Jun. +
2-4-carpellate +
intermediate +
pink +, usually white +  and cream blue or purple +
distinct +
spreading +  and incurved +
6 +  and 5 +
keeled;lanceolate;deltate +
Endemic +  and Conservation concern +
spreading +  and prostrate +
Ceanothus fresnensis +
Ceanothus subg. Cerastes +
species +
paniclelike +  and racemelike +
not gland-tipped +
unarmed +  and armed +
shrub +  and matlike +
polygamous +, dioecious +  and synoecious +