目前为止，中国西南野生生物种质资源库共保藏该物种: 种子8份; DNA材料17份; DNA1份;

• 科:杜鹃花科    Ericaceae
• 属:杜鹃属    Rhododendron
• 种:密枝杜鹃   Rhododendron fastigiatum

86. Rhododendron fastigiatum Franchet, Bull. Soc. Bot. France. 33: 234. 1886. 密枝杜鹃 mi zhi du juan Rhododendron nanum H. Léveillé.Small shrubs, usually forming dense cushions or mats, 0.8–1(–1.5) m tall. Petiole 1–2(–3) mm, scaly; leaf blade oblong, elliptic or ovate, (0.45–)0.7–1.4(–1.6) × (0.28–)0.3–0.6 (–0.9) cm; base obtuse or cuneate; apex rounded or obtuse, mucronate; abaxial surface pale gray-green, scales not contiguous, usually uniformly pale fawn, opaque; adaxial surface dark green, scales dense. Inflorescence (1–)3(–5)-flowered. Pedicel 0.2–2 cm, scaly; calyx lobes (2.5–)3–4.5(–5.5) mm, oblong or broadly elliptic, persistent in fruit, scaly, ciliate; corolla broadly funnelform, purple-blue to pinkish purple, 1–1.5(–1.8) cm, tube 3–6.5(–8) mm, outer surface usually sparsely scaly, inner surface pubescent; stamens (6–)10(–11), filaments pubescent towards base; ovary ca. 2 mm, scaly; style longer than stamens, glabrous or rarely puberulous at base. Capsule ovoid, 4–6 mm, densely scaly. Fl. May–Jun, fr. Aug–Sep.Pinus forests, Rhododendron thickets, alpine moorlands, rocky slopes, screes, cliffs; 3000–4500 m. C and NW Yunnan.【引自：Flora of China】

常绿灌木，高0.8-1（-1.5）米，分枝稠密，常成垫状或平卧。幼枝短，带红褐色，被暗褐色鳞片。叶芽鳞早落。叶集生于小枝顶端，革质，长圆形、椭圆形或卵形，长（4.5-）7-14（-16）毫米，宽（2.8-）3-6（-9）毫米，顶端圆或钝，有短突尖，基部钝或楔形，边缘稍反卷，上面暗绿色，被不邻接的鳞片，鳞片常为琥珀色，光亮晶莹，边缘色淡，下面灰绿色，被同一式鳞片，鳞片无光泽，灰白色或黄棕色，不邻接，相距小于其直径，或偶有部分邻接；叶柄长1-2（3）毫米，被鳞片。花序顶生，伞形总状，有花（1-）3-4（5）朵，花芽鳞早落；花梗短，长0.2-2毫米，被鳞片；花萼发达，长（2.5-）3-4.5（-5.5）毫米，裂片长圆形或宽椭圆形，外面被鳞片，被缘毛；花冠宽漏斗状，长1-1.5（-1.8）厘米或更长，紫蓝色或鲜淡紫红色，外面常有少数鳞片，花管长3-6.5（-8）毫米，长约为裂片的1/2，内面喉部被密毛；雄蕊（6-）10（11），较花冠稍短或近等长，花丝近基部被毛；子房长约2毫米，被鳞片，花柱细长，超出雄蕊，无毛或罕在基部被微毛。蒴果卵圆形，长4-6毫米，被鳞片。花期5-6月，果期8-9月。 【引自：中国植物志】