Rhamnus serrata

Humboldt & Bonpland ex Willdenow in J. J. Roemer et al.

Syst. Veg. 5: 295. 1819.

Common names: Sawleaf buckthorn
Synonyms: Rhamnus fasciculata Greene R. serrata var. guatemalensis L. A. Johnson R. smithii subsp. fasciculata (Greene) C. B. Wolf
Treatment appears in FNA Volume 12. Treatment on page 49. Mentioned on page 46.

Shrubs to small trees, 0.8–2.5 m, unarmed. Branchlets gray-brown, 2 cm, puberulent, glabrescent. Bud-scales dark red to reddish-brown, coriaceous, dull. Leaves deciduous, alternate to subopposite; petiole 3–4 mm; blade usually yellowish-brown, rarely green, abaxially, green adaxially, elliptic to elliptic-lanceolate or elliptic-oblong, 1.5–5 (–5.5) cm, herbaceous, base cuneate to rounded or truncate, margins serrulate to crenulate, apex obtuse, both surfaces minutely hirtellous, often more densely so abaxially; secondary-veins 5–8 (–11) pairs, all diverging at nearly same angle. Inflorescences fascicles or flowers solitary. Pedicels 1–4 mm. Sepals 4. Petals 4. Drupes black, globose or slightly elongate, 4–6 (–8) mm; stones 2.


Phenology: Flowering Apr–Jun.
Habitat: Canyons, stream banks, open hillsides, ledges, ridges, among boulders, gravelly limestone hills, roadsides, mesic forests, woodlands.
Elevation: 1500–2600 m.

Distribution

V12 938-distribution-map.jpg

Ariz., N.Mex., Tex., Mexico, Central America (Guatemala)

Discussion

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Rhamnus serrata"
perigynous +  and epigynous +
Guy L. Nesom +  and John O. Sawyer† +
Humboldt & Bonpland ex Willdenow in J. J. Roemer et al. +
cuneate +  and rounded +
5 cm50 mm <br />0.05 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
green +  and yellowish-brown +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
elliptic;elliptic-lanceolate or elliptic-oblong +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
glabrescent +  and puberulent +
2 cm20 mm <br />0.02 m <br /> (?) +
dark red;reddish-brown +
Sawleaf buckthorn +
Ariz. +, N.Mex. +, Tex. +, Mexico +  and Central America (Guatemala) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
elongate +  and globose +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1500–2600 m. +
bisexual +  and unisexual +
Canyons, stream banks, open hillsides, ledges, ridges, among boulders, gravelly limestone hills, roadsides, mesic forests, woodlands. +
circumscissile +
free +  and adnate +
campanulate +  and cupulate +
unisexual +  and bisexual +
alternate +  and subopposite +
deciduous +
serrulate;crenulate +
intrastaminal +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
not fleshy +
perigynous +  and epigynous +
yellowish +  and cream +
adnate +  and distinct +
not clawed +  and spatulate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering Apr–Jun. +
2-4-carpellate +
oblong-obovoid +  and obovoid +
greenish white +  and white +
distinct +
crested;not keeled;ovate-triangular +
opposite +  and subopposite +
4 +  and 5 +
2 +  and 4 +
Rhamnus fasciculata +, R. serrata var. guatemalensis +  and R. smithii subsp. fasciculata +
Rhamnus serrata +
species +
deciduous +  and evergreen +
spreading +  and erect +
polygamous +, dioecious +  and synoecious +