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11. PYRACANTHA M. Roemer, Fam. Nat. Syn. Monogr. 3: 104, 219. 1847.

火棘属 huo ji shu

Gu Cuizhi (Ku Tsue-chih); Stephen A. Spongberg

Sportella Hance.

Shrubs or small trees, evergreen, usually with thorny branches; buds small, pubescent. Leaves simple, alternate or fascicled, shortly petiolate or sessile, venation camptodromous, margin crenulate, serrulate, or entire; stipules caducous, minute. Inflorescences compound corymbs; hypanthium short. Sepals 5. Petals 5, spreading, white, usually suborbicular, base shortly clawed. Stamens 15–20; anthers yellow. Carpels 5; basally ca. 1/2 adnate to hypanthium, apically free; ovary 5-loculed, semi-inferior, with 2 ovules per locule; styles 5, free. Pome red or orange, globose, with persistent incurved sepals at apex; pyrenes (nutlets) 5.

About ten species: E Asia to SE Europe; seven species (five endemic) in China.

Further study is necessary to determine the placement of Pyracantha crenulata (D. Don) M. Roemer (Fam. Nat. Syn. Monogr. 3: 220. 1847; Mespilus crenulata D. Don, Prodr. Fl. Nepal. 238. 1825), reportedly present in SE Xizang, and the recently described species P. heterophylla T. B. Chao & Zhi X. Chen (Bull. Bot. Res., Harbin 17: 302. 1997) and P. stoloniformis T. B. Chao & Zhi X. Chen (loc. cit.: 301).

1 Corymbs dense; pedicel 1–2 mm; hypanthium abaxially densely tomentose.   (2)
+ Corymbs loose; pedicel 4–10 mm; hypanthium glabrous or abaxially slightly pubescent.   (3)
2 (1) Leaf apically acute, blade oblong to oblong-obovate; petiole 4–6(–9) mm; branches usually unarmed.   6 P. inermis
+ Leaf apically obtuse or truncate, blade obovate to obovate-elliptic; petiole to 2 mm; branches with short thorns.   7 P. densiflora
3 (1) Leaves abaxially densely tomentose.   5 P. angustifolia
+ Leaves abaxially glabrous or pubescent.   (4)
4 (3) Leaf margin crenulate, apex acute, apiculate, or obtuse, blade oblong or oblanceolate, rarely ovate- lanceolate.   4 P. crenulata
+ Leaf margin crenate-serrate, serrulate, or entire, apex obtuse, emarginate, or slightly apiculate, blade usually obovate to obovate-oblong.   (5)
5 (4) Leaf blade crenate-serrate at margin, broadest in apical part.   1 P. fortuneana
+ Leaf blade usually entire, sometimes serrulate, broadest at or near middle.   (6)
6 (5) Leaf apically usually slightly apiculate or obtuse, abaxially glaucescent, blade usually elliptic or oblong.   2 P. atalantioides
+ Leaf apically emarginate or truncate, abaxially pubescent, blade usually narrowly elliptic to narrowly obovate.   3 P. koidzumi

Lower Taxa


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