The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

island redberry

sawleaf buckthorn

Habit Shrubs to small trees, 2.5–6(–10) m, unarmed. Shrubs to small trees, 0.8–2.5 m, unarmed.
Branchlets

purple to gray, glabrous or puberulent.

gray-brown, 2 cm, puberulent, glabrescent.

Leaves

persistent, alternate;

petiole 5–10 mm;

blade dull reddish to yellowish brown abaxially, usually shiny green adaxially, broadly elliptic to oblong or ovate-oblong, (1.5–)2–5(–6) cm, distinctly coriaceous, base cuneate to nearly truncate, margins blunt-serrate or entire, apex acute to rounded, apiculate, both surfaces glabrous;

secondary veins 5–9 pairs, all diverging at nearly same angle.

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.

fascicles or flowers solitary.

Pedicels

3–6 mm.

1–4 mm.

Drupes

red, globose, 6–8 mm;

stones 2.

black, globose or slightly elongate, 4–6(–8) mm;

stones 2.

Sepals

4.

4.

Petals

0.

4.

Bud

scales dark red to reddish brown, coriaceous, dull.

Rhamnus pirifolia

Rhamnus serrata

Phenology Flowering (Jan–)Feb–Jun. Flowering Apr–Jun.
Habitat Steep slopes, canyon walls and bottoms, dunes, grasslands, coastal sage scrub, chaparral, pine woodlands. Canyons, stream banks, open hillsides, ledges, ridges, among boulders, gravelly limestone hills, roadsides, mesic forests, woodlands.
Elevation 10–500 m. (0–1600 ft.) 1500–2600 m. (4900–8500 ft.)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; Mexico; Central America (Guatemala)
[BONAP county map]
Discussion

Rhamnus pirifolia is known in California on the Channel Islands and in Baja California on Guadalupe Island; it has not been implicated in hybridization with other members of the R. crocea complex.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 12, p. 47. FNA vol. 12, p. 49.
Parent taxa Rhamnaceae > Rhamnus Rhamnaceae > Rhamnus
Sibling taxa
R. alaternus, R. alnifolia, R. arguta, R. cathartica, R. crocea, R. davurica, R. ilicifolia, R. japonica, R. lanceolata, R. pilosa, R. serrata, R. smithii, R. utilis
R. alaternus, R. alnifolia, R. arguta, R. cathartica, R. crocea, R. davurica, R. ilicifolia, R. japonica, R. lanceolata, R. pilosa, R. pirifolia, R. smithii, R. utilis
Synonyms R. crocea subsp. pirifolia, R. crocea var. pirifolia R. fasciculata, R. serrata var. guatemalensis, R. smithii subsp. fasciculata
Name authority Greene: Pittonia 3: 15. (1896) Humboldt & Bonpland ex Willdenow: in J. J. Roemer et al., Syst. Veg. 5: 295. (1819)
Web links