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