Berberis swaseyi

Buckley ex M. J. Young

Famil. Lessons Bot., 152. 1873.

Endemic
Synonyms: Mahonia swaseyi (Buckley ex M. J. Young) Fedde
Treatment appears in FNA Volume 3.

Shrubs, evergreen, 1-2 m. Stems ± dimorphic, with elongate primary and short or somewhat elongate axillary shoots. Bark of 2d-year stems purple, glabrous. Bud-scales 1.5-4 mm, deciduous. Spines absent. Leaves 5-9-foliolate (basal pair of leaflets sometimes reduced to bristles); petioles 0.1-0.5 cm. Leaflet blades thin or thick and rigid; surfaces abaxially dull, papillose, adaxially dull, somewhat glaucous; terminal leaflet stalked (sessile in a few leaves), blades 1.8-3.5 × 0.7-1.7 cm, 1.3-4.7 times as long as wide; lateral leaflets oblong to elliptic or lanceolate, 1-veined from base, base truncate to obtuse, rarely acute, margins plane or undulate, toothed, each with 3-8 teeth 0.5-2 mm high tipped with spines to 0.6-1.2 × 0.1-0.2 mm, apex rounded to acuminate. Inflorescences racemose, lax, 2-6-flowered, 4-6 cm; bracteoles leathery, apex spinose-acuminate, sometimes with proximal bracteoles as described, distal membranous and acuminate. Flowers: anther-filaments with distal pair of recurved lateral teeth. Berries white or red and somewhat glaucous, spheric, 9-16 mm, dry or juicy, hollow.


Phenology: Flowering winter–spring (Feb–Apr).
Habitat: Limestone ridges and canyons
Elevation: 150-600 m

Discussion

Berberis swaseyi is endemic to the Edwards Plateau. According to M. C. Johnston (pers. comm.), B. swaseyi and B. trifoliolata hybridize in central Texas.

Berberis swaseyi is susceptible to infection by Puccinia graminis.

Selected References

None.

Lower Taxa

None.

"thick" is not a number. "thin" is not a number.

... more about "Berberis swaseyi"
Alan T. Whittemore +
Buckley ex M. J. Young +
acute;truncate;obtuse +
Mahonia +
red +  and white +
0.9 cm9 mm <br />0.009 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
juicy +  and dry +
1.8 cm18 mm <br />0.018 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
obovate +, oblanceolate +  and elliptic +
1.2 cm12 mm <br />0.012 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
0.7cm;1.7cm +
scale-like +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
150-600 m +
small +  and large +
showy +  and inconspicuous +
0.3 cm3 mm <br />0.003 m <br /> (?) +  and 0.8 cm8 mm <br />0.008 m <br /> (?) +
compound +  and simple +
spheric +  and cylindric-ovoid or ellipsoid +
Limestone ridges and canyons +
axillary +  and terminal +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
5-9-foliolate +
reduced +
toothed;undulate;plane +
1-carpellate +
basal +  and superior +
club--shaped +
3-merous +  and 2-merous +
nectariferous +
distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering winter–spring (Feb–Apr). +
Famil. Lessons Bot., +
not nodose +
1 +  and 10 +
distinct +
elongate +
0.6mm;1.2mm +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
elongating +
monomorphic +, unbranched +  and branched +
with elongate primary-stems and short axillary spur shoots +  and elongate +
palmate +  and pinnate +
persistent +
papillose +
Mahonia swaseyi +
Berberis swaseyi +
Berberis +
species +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
glabrous +  and with tomentose stems +