Pyracantha koidzumii

(Hayata) Rehder

J. Arnold Arbor. 1: 261. 1920.

Common names: Taiwan firethorn
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


V9 797-distribution-map.jpg

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


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


Lower Taxa

... more about "Pyracantha koidzumii"
Ronald W. Lance +  and Peter F. Zika +
(Hayata) Rehder +
Cotoneaster koidzumii +
Taiwan firethorn +
Ala. +, Ariz. +, Ark. +, Calif. +, Fla. +, Ga. +, La. +, Miss. +, Okla. +, S.C. +, Tex. +, e Asia (Taiwan) +, introduced also in Pacific Islands (Hawaii) +  and Australia. +
0–1500 m +
Disturbed forests, beach bluffs, riparian areas, thickets, roadsides +
Flowering Feb–May +  and fruiting Jul–Feb. +
J. Arnold Arbor. +
Introduced +
Sportella +
Pyracantha koidzumii +
Pyracantha +
species +