Rhamnus pirifolia |
Rhamnus serrata |
|
---|---|---|
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 |
CA; Mexico (Baja California)
|
AZ; NM; TX; Mexico; Central America (Guatemala) |
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 | ||
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 |