Rhododendron augustinii Hemsl. subsp. chasmanthum (Diels) Cullen f. rubrum (David.) R. C. Fang (Ericaceae)
(1) 红花张口杜鹃（变型）（云南植物研究）
名称文献：Rhododendon augustinii Hemsl. subsp. chasmanthum (Diels) Cullen f. rubrum (Davidian) R. C. Fang in Act. Bot. Yunn. 4:255. 1982；云南植物志4: 491. 1986. —R. agustinii var. rubrum Davidian in Rhodod. and Cam. Year. Book. 17: 165. 1963. — R. augustinii subsp. rubrum (Davidian) Cullen in Not. Bot. Gard. Edinb. 36:109. 1978.—R. bergii Davidian in Quart. Bull. Amer. Rhod. Soc. 30: 210. 1976.
形态特征：本变型的特征为花冠红色；枝叶稠密；在栽培情况下花期先于原变种3—4周。产云南维西雪龙山。生于海拔4300米的山谷边岩坡灌丛中。模式标本系Forrest采自雪龙山（No.25914）引种在英国的栽培植物。