Cornus occidentalis

(Torrey & A. Gray) Coville

Contr. U.S. Natl. Herb. 4: 117. 1893.

Common names: Creek dogwood
Endemic
Basionym: Cornus sericea var. occidentalis Torrey & A. Gray Fl. N. Amer. 1: 652. 1840
Synonyms: C. alba var. occidentalis (Torrey & A. Gray) B. Boivin C. californica C. A. Meyer C. californica var. pubescens J. F. Macbride C. sericea subsp. occidentalis (Torrey & A. Gray) Fosberg
Treatment appears in FNA Volume 12. Treatment on page 454. Mentioned on page 451.

Shrubs, to 3 m, flowering at 1 m; rhizomes absent. Stems clustered; bark green to maroon or reddish-brown, not corky, loosely verrucose; branchlets red, reddish-brown, maroon, or green, mostly erect-hairy when young; lenticels protruding on 2d year branches, area surrounding them not suffused with purple on older branches; pith white. Leaves: petiole 10–20 mm; blade ovate, 5–12 × 2–6 cm, base cuneate to rounded, apex slightly acuminate, abaxial surface white, hairs erect, especially dense near midvein, tufts of erect hairs present in axils of secondary-veins, vein hairs brown, appressed, adaxial surface green, hairs appressed; secondary-veins 6–7 per side, most arising from proximal 1/2, tertiary-veins not prominent. Inflorescences flat-topped, 3–6 cm diam., peduncle 20–40 mm; branches and pedicels maroon. Flowers: hypanthium densely erect-hairy; sepals 0.3–0.7 mm; petals white, 3.5–4 mm. Drupes white, globose, 8 mm diam.; stone oblate-ellipsoid, 4–5 × 5–7 mm, with 3 ridges on each face, furrowed laterally, apex pointed.


Phenology: Flowering May–Jun and Sep–Oct; fruiting Aug–Oct.
Habitat: Wet meadows, bogs, marshes, stream banks, lake shores, river banks.
Elevation: 0–2000 m.

Distribution

V12 503-distribution-map.jpg

B.C., Alaska, Calif., Idaho, Mont., Nev., Oreg., Wash.

Discussion

F. R. Fosberg (1942) and H. W. Rickett (1944b) examined variation within the Cornus sericea complex in North America. Fosberg regarded the whole complex as a single species, stating that the differences in indumentum were not sufficient to distinguish two taxa. In contrast, Rickett concluded that there were two species, C. occidentalis and C. sericea, and that treatment is followed here.

The illegitimate name Cornus pubescens Nuttall has sometimes been used for this species.

Selected References

None.

Lower Taxa

None.
... more about "Cornus occidentalis"
versatile +  and dorsifixed +
not suffused +
curling +
ornamented +
Zack E. Murrell +  and Derick B. Poindexter +
(Torrey & A. Gray) Coville +
green +  and maroon or reddish-brown +
verrucose +
cuneate +  and rounded +
Cornus sericea var. occidentalis +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
2cm;6cm +
not petaloid +
alternate +, subopposite +, whorled +  and opposite +
Creek dogwood +
expanding +  and minute +
B.C. +, Alaska +, Calif. +, Idaho +, Mont. +, Nev. +, Oreg. +  and Wash. +
8 cm80 mm <br />0.08 m <br /> (?) +
distinct +
globose +
0–2000 m. +
Wet meadows, bogs, marshes, stream banks, lake shores, river banks. +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
terminal +  and axillary +
alternate +, subopposite +, whorled +  and opposite +
intrastaminal +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
distinct +
recurved +  and spreading +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering May–Jun and Sep–Oct +  and fruiting Aug–Oct. +
[1-]2[-4]-carpellate +
Contr. U.S. Natl. Herb. +
connate +  and distinct +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
free +  and distinct +
pointed +  and rounded +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
oblate-ellipsoid +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
C. alba var. occidentalis +, C. californica +, C. californica var. pubescens +  and C. sericea subsp. occidentalis +
Cornus occidentalis +
Cornus subg. Thelycrania +
species +
deciduous +  and perennial +