Frangula obovata

(Kearney & Peebles) G. L. Nesom & J. O. Sawyer

Phytologia 91: 302. 2009.

Common names: Pearleaf buckthorn
Endemic
Basionym: Rhamnus betulifolia var. obovata Kearney & Peebles J. Wash. Acad. Sci. 29: 486. 1939
Synonyms: Frangula betulifolia subsp. obovata (Kearney & Peebles) Kartesz & Gandhi
Treatment appears in FNA Volume 12. Treatment on page 58. Mentioned on page 52, 53.

Shrubs, 1–2.5 m. Stems red to brown or gray-brown, glabrous or pubescent. Leaves deciduous; petiole 5–14 mm; blade usually equally green on both surfaces, not glaucous, obovate to oblong-obovate or oblong, (4–) 5–9 × 3.2–6 cm, 1.2–1.8 (–2.5) times longer than wide, subcoriaceous to distinctly coriaceous, base truncate to subcordate, margins serrulate to nearly entire, apex obtuse to truncate or rounded, both surfaces minutely puberulous to hirtellous, glabrescent; secondary-veins (5–) 6–8 (–9) pairs. Inflorescences umbels, pedunculate, 2–12-flowered. Pedicels 3–10 mm. Stigmas 3-lobed. Drupes black, globose, 5–8 mm; stones 3.


Phenology: Flowering Apr–Jun.
Habitat: Hanging gardens, cliff faces, talus, canyon bottoms, seepage below cliffs, stream and creek banks.
Elevation: 1300–2400 m.

Discussion

Frangula obovata is known from Clark County, Nevada, across northern Arizona and southern Utah to southwestern Colorado; its distribution does not overlap that of F. betulifolia.

Selected References

None.

Lower Taxa

None.
... more about "Frangula obovata"
perigynous +  and epigynous +
obtuse +  and truncate or rounded +
John O. Sawyer† +  and Guy L. Nesom +
(Kearney & Peebles) G. L. Nesom & J. O. Sawyer +
truncate +  and subcordate +
Rhamnus betulifolia var. obovata +
protruding +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1.2-1.8(-2.5) +
5 cm50 mm <br />0.05 m <br /> (9 cm90 mm <br />0.09 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
not glaucous +
obovate;oblong-obovate or oblong +
subcoriaceous +  and distinctly coriaceous +
3.2 cm32 mm <br />0.032 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Pearleaf buckthorn +
Ariz. +, Colo. +, Nev. +  and Utah. +
globose +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1300–2400 m. +
Hanging gardens, cliff faces, talus, canyon bottoms, seepage below cliffs, stream and creek banks. +
circumscissile +
free +  and adnate +
unisexual +  and bisexual +
2-12-flowered +  and pedunculate +
deciduous +
serrulate to nearly +
intrastaminal +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not fleshy +
perigynous +  and epigynous +
adnate +  and distinct +
clawed +, broadly obovate +  and obcordate +
0.5 cm5 mm <br />0.005 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
Flowering Apr–Jun. +
2-4-carpellate +
not furrowed +
obovoid +  and lenticular +
yellowish +  and green or white +
distinct +
spreading +  and erect +
keeled;ovate-triangular +
red +  and brown or gray-brown +
pubescent +  and glabrous +
indehiscent +
glabrescent +, minutely puberulous +  and hirtellous +
Frangula betulifolia subsp. obovata +
Frangula obovata +
Frangula +
species +
deciduous +  and evergreen +
polygamous +, dioecious +  and synoecious +