Glandular Kamtchatka rhododendron

Rhododendron camtschaticum Pallas subsp. glandulosum (Standley ex Small) Hultén; R. camtschaticum Pallas var. glandulosum (Standley) B. Boivin; R. glandulosum (Standley ex Small) Millais; Therorhodion camtschaticum var. pumilum (E. A. Busch) T. Yamazaki

Shrubs to 1 dm. Stems multicellular, eglandular-hairy (hairs unbranched) and stipitate-glandular-hairy, glabrate with age. Leaves often clustered toward distal portions of shoots; blade elliptic to obovate, sometimes ovate, 1-3.5 × 0.4-1.5 cm, thin, margins ciliate (hairs stipitate-glandular), plane, apex rounded to obtuse or acute, mucronate, surfaces glandular-hairy. Floral bud scales (and leaflike inflorescence bracts) stipitate-glandular-hairy. Inflorescences 2-3-flowered, sometimes flowers solitary; axis elongate. Pedicels 1-4.7 cm, stipitate-glandular-hairy; bracteoles 2, green, smaller than leaves. Flowers opening after shoot development, appearing to terminate leafy shoots due to their leaflike bracts; calyx lobes 7-16 mm, stipitate-glandular-hairy; corolla purple, upper 3 lobes with darker spots, 16-25 mm, margins smooth, ± glabrous on outer surface, tube ± absent due to slit between lower 2 lobes, lobes 11-24 mm; stamens unicellular-hairy proximally. Capsules 5-11 mm, unicellular-hairy. 2n = 24, 26.

Flowering summer. Arctic and alpine meadows, tundra, balds, moraines, and subalpine woods; 0-1500 m; Alaska; e Asia (Japan, Russian Far East).

Therorhodion glandulosum is found on the Seward Peninsula and in the lower Yukon River valley.