Pyracantha koidzumii

(Hayata) Rehder

J. Arnold Arbor. 1: 261. 1920.

Common names: Taiwan firethorn
Introduced
Basionym: Cotoneaster koidzumii Hayata J. Coll. Sci. Imp. Univ. Tokyo 30(1): 101. 1911 (as koizumii)
Treatment appears in FNA Volume 9. Treatment on page 471. Mentioned on page 469, 472.

Plants 5–40 dm. Stems: thorns sparse to abundant; young twigs reddish brown-hairy, glabrescent. Leaves: stipules 3–8 mm; petiole 1–3 mm; blade oblanceolate or narrowly obovate, 2.5–4.5 × 0.5–1.2 cm, base cuneate, margins entire, rarely with minute teeth near apices, apex truncate or retuse, rarely rounded, abaxial surface brown-hairy, becoming glabrate and pale green, not glaucescent, adaxial glabrous. Inflorescences 3–4 cm diam. Pedicels 5–12 mm, sparsely brown-hairy. Flowers 8–10 mm diam.; hypanthium densely hairy; calyx brown or yellowish brown-puberulent when young, glabrescent, sepals triangular, 1–1.3 mm, apex acute; petals suborbiculate, 3–4 mm, apex slightly emarginate. Pomes orange-red, 4–7 mm diam.; pedicels 5–13 mm.


Phenology: Flowering Feb–May; fruiting Jul–Feb.
Habitat: Disturbed forests, beach bluffs, riparian areas, thickets, roadsides
Elevation: 0–1500 m

Distribution

V9 797-distribution-map.jpg

Introduced; Ala., Ariz., Ark., Calif., Fla., Ga., La., Miss., Okla., S.C., Tex., e Asia (Taiwan), also in Pacific Islands (Hawaii), Australia

Discussion

Occasional specimens of Pyracantha fortuneana with sparsely toothed leaf margins can be difficult to distinguish from P. koidzumii, and some plants in California may be of hybrid origin or represent escapes of horticultural selections.

Selected References

None.

Lower Taxa

None.
... more about "Pyracantha koidzumii"
not glaucescent +
glabrate +  and brown-hairy +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Ronald W. Lance +  and Peter F. Zika +
(Hayata) Rehder +
fissured +
compound +  and simple +
opposite +  and alternate +
cuneate +
Cotoneaster koidzumii +
2.5 cm25 mm <br />0.025 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
obovate +  and oblanceolate +
1 cm10 mm <br />0.01 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.5cm +  and 1.2cm +
lanceolate +
yellowish brown-puberulent +  and brown +
glabrescent +
adnate +  and distinct +
tomentose +  and glabrous +
Taiwan firethorn +
Ala. +, Ariz. +, Ark. +, Calif. +, Fla. +, Ga. +, La. +, Miss. +, Okla. +, S.C. +, Tex. +, e Asia (Taiwan) +, also in Pacific Islands (Hawaii) +  and Australia +
not +  and aggregated +
0–1500 m +
tomentose +  and glabrous +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
yellow +, orange-red +  and red +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Disturbed forests, beach bluffs, riparian areas, thickets, roadsides +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
crassinucellate +
late-deciduous +  and persistent +
tomentose +  and glabrous +
crenulate +, revolute +  and flat +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
tomentose +  and glabrous +
flat-topped +
0.5 cm5 mm <br />0.005 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0 (?) +  and 4 (?) +
free +  and distinct +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Feb–May +  and fruiting Jul–Feb. +
adnate +, free +, connate +  and distinct +
orange-red +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
J. Arnold Arbor. +
not arillate +
persistent +
free +  and distinct +
incurved +, erect +  and spreading +
triangular +
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
Introduced +
free +  and distinct +
branched +  and simple +
straight +
1 +  and 3 +
geniculate +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
membranous +
persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
glabrescent +, sparsely hairy +  and densely tomentose +
Sportella +
Pyracantha koidzumii +
Pyracantha +
species +
tomentose +  and glabrous +
inconspicuous +
reddish brown-hairy +
glabrescent +
reclining +  and spreading +