《中国植物志》|| 蔷薇科 ROSACEAE ||两列系 Ser. Distichi Yu ||平枝栒子 Cotoneaster horizontalis Decne.

51. 平枝栒子（经济植物手册）栒刺木、岩楞子、山头姑娘（四川土名），平枝灰栒子（华北经济植物志要），矮红子、被告惹（贵州土名）
Cotoneaster horizontalis Dcne. in Fl. Serr. 22: 168. 1877; Schneid. Ill. Handb. Laubh. 1: 745. 1906; Rehd. & Wils. in Sarg. Pl. Wils. 1: 154. 1912; Rehd. in Journ. Arn. Arb. 5: 175. 1924 & 13: 302. 1932; 陈嵘, 中国树木分类学438. 1937; Hurusawa in Acta Phytotax. Geobot. 13: 237. 1943; 中国高等植物图鉴2: 201. 图2132. 1972.——C. acuminata var. β. prostrata Hook. ex Dcne. in Nouv. Arch. Mus. Hist. Nat. Paris 10: 175. 1874. ——C. symonsii Loud. ex Koehne, Deuts. Dendr. 225. 1893. pro syn. ——Diospyros chaffanjoni Levl. in Fedde, Repert. Sp. Nov. 12: 101. 1913 & Fl. Kouy-Tcheou 145. 1914.——Cotoneaster microphylla auct. non Lindl. 1827: Diels in Engler, Bot. Jahrb. 29: 386. 1901. p. p.
落叶或半常绿匍匐灌木，高不超过0.5米，枝水平开张成整齐两列状；小枝圆柱形，幼时外被糙伏毛，老时脱落，黑褐色。叶片近圆形或宽椭圆形，稀倒卵形，长5-14毫米，宽4-9毫米，先端多数急尖，基部楔形，全缘，上面无毛，下面有稀疏平贴柔毛；叶柄长1-3毫米，被柔毛；托叶钻形，早落。花1-2朵，近无梗，直径5-7毫米；萼筒钟状，外面有稀疏短柔毛，内面无毛；萼片三角形，先端急尖，外面微具短柔毛，内面边缘有柔毛；花瓣直立，倒卵形，先端圆钝，长约4毫米，宽3毫米，粉红色；雄蕊约12，短于花瓣；花柱常为3，有时为2，离生，短于雄蕊；子房顶端有柔毛。果实近球形，直径4-6毫米，鲜红色，常具3小核，稀2小核。花期5-6月，果期9-10月。
产陕西、甘肃、湖北、湖南、四川、贵州、云南。生于灌木丛中或岩石坡上，海拔2000-3500米。尼泊尔也有分布。
本种和匍匐栒子 C. adpressus Bois 相近似，主要异点在于后者茎平铺地上，呈不规则分枝，叶片宽卵形或倒卵形，稀椭圆形，叶边呈波状起伏，果实直径6-7毫米，常具2小核。
平枝栒子小叶变种 小叶栒刺木（中国树木分类学）
C. horizontalis Dcne. var. perpusillus Schneid. Ill. Handb. Laubh. 1: 745. f. 419 e2. 1906; Rehd. & Wils. in Sarg. Pl. Wils. 1: 155. 1912; 陈嵘, 中国树木分类学439. 1937.
本变种与原变种的异点在于枝干平铺，叶形较小，长6-8毫米，果实椭圆形，长5-6毫米。
产湖北、陕西、四川、贵州。生于山岩上或山坡多石地，海拔1500-2400米。

《云南植物志》|| 蔷薇科 Rosaceae ||栒子属 Cotoneaster Medikus ||平枝栒子 Cotoneaster horizontalis Dcne.

28. 平枝栒子（经济植物手册）
Cotoneaster horizontalis Dcne. (1877); Andre (1885)*, (1889)*; Schneid. (1906); Rehd. et Wils. in Sarg. (1912); Rehd. (1924），(1932); Hurusawa (1943); 中国树木分类学 (1937); Hursawa (1943); 图鉴 (1972)*; 中国植物志 (1974)*; 云南种子植物名录 (1984); Flora of China (2003).
Cotoneaster ascendens Flinck et Hylmo (1966); Klotz (1972); Phipps (1990) syn. nov.; C. acuminatus var. β. prostrate Hook. ex Dcne (1874); C. horizontalis Dcne. var. perpusillus Schneid. (1906)*; Rehd. et Wils. (1912); 中国植物志 (1974); Flora of China (2003) syn. nov.; C. perpusillus (Schneid.) Flinck et Hylmo (1966); C. perpusillus (Schneid.) Klotz, syn. nov.; C. microphylla auct. non Lindl. 1827: Diels (1901); Diospyros chaffanjoni Levl. (1913).
落叶或半常绿匍匐灌木。枝水平开张成整齐两列状，小枝黑褐色，圆柱形，幼时被糙伏毛，老时脱落。叶片近圆形或宽椭圆形，稀倒卵形，长5-14毫米，宽4-9毫米，先端常急尖，基部楔形，全缘，上面无毛，背面疏被平贴柔毛；叶柄长1-3毫米，被柔毛；托叶钻平，早落。花1-2朵，近无梗，直径5-7毫米；萼筒钟状，外面疏被短柔毛，内面无毛，萼片三角形，先端急尖，外面微被短柔毛，内面边缘被柔毛；花瓣直立，粉红色，倒卵形，先端钝圆，长约4毫米，宽约3毫米；雄蕊约12枚，短于花瓣；花柱3（-2），离生，短于雄蕊，子房顶端被柔毛。果实近球形，直径4-6毫米，鲜红色，核3（-2）。花期5-6月，果期8-10月。
产镇雄，大关、彝良；生于海拔2000-4000米的灌木丛中或岩石坡上。分布于陕西、甘肃、湖北、湖南、四川、贵州。尼泊尔也有。

《Flora of North America》|| Amaryllidaceae || Rosaceae subfam. Amygdaloideae || Cotoneaster horizontalis

22. Cotoneaster horizontalis Decaisne, Ann. Gén. Hort. 22: 168. 1877.

Herringbone cotoneaster

Shrubs, 0.5–1 m. Stems ascending to erect, spreading horizontally; branches distichous, maroon, initially densely yellow-strigose. Leaves deciduous (tardily so on a few vigorous shoots); petiole 2–3 mm, strigose; blade elliptic or broadly elliptic, on vigorous shoots usually broadly elliptic, sometimes suborbiculate, orbiculate, or broadly obovate, 4–14 x 5–9 mm, subcoriaceous, base obtuse or cuneate, margins flat, veins 2–4, superficial, apex acute, apiculate or obtuse, mucronulate, abaxial surfaces green, sparsely long-strigose, adaxial dark green, shiny, not glaucous, flat between lateral veins, smooth to slightly rugose, glabrescent; ˂fall leaves orange to rich red˃. Inflorescences on fertile shoots 8–20 mm with 3 or 4 leaves, 1–3-flowered, compact. Pedicels 1–2 mm, strigose. Flowers 5–7 mm, closed; hypanthium funnelform, sparsely pilose-strigose; sepals: margins villous, apex acute or acuminate, surfaces sparsely strigose; petals erect-incurved, dark pink to dark red, base blackish red, margins pale crimson; stamens (8–)10(–14), filaments dark red, anthers white; styles 2 or 3(or 4). Pomes bright red, usually broadly obovoid, sometimes obovoid, rarely subglobose, 5–8.5 x 4.5–7.7 mm, shiny, not glaucous, glabrate; sepals suberect, sparsely strigose or glabrate; navel open; style remnants 1/2–3/4 from base. Pyrenes 2 or 3(or 4), ˂distinct˃. 2n = 68 (Germany).

Flowering Apr–May; fruiting Sep–Mar. Thickets, disturbed forests, paths, cliffs, pilings, rockwork; 0–500 m; introduced; B.C.; Calif., Oreg., Wash.; Asia (China); introduced also in Europe.

L. Lingdi and A. R. Brach (2003) included within Cotoneaster horizontalis several taxa recognized here as distinct species, including C. flinckii J. Fryer & B. Hylmö and C. perpusillus (C. K. Schneider) Flinck & B. Hylmö. Reports of C. horizontalis from Ontario (J. K. Morton and J. M. Venn 1990) are here referred to C. divaricatus. Reports of C. horizontalis from Indiana are not supported by specimens.