384 WILSON EXPEDITION TO CHINA 
in the irregular ring of hairs at the mouth of the corolla formed by hairy disk-like 
excrescences at the base of the filaments and in a hairy crescent-shaped crest 
below the base of the lower lip, and in the rostrate nutlets. The drooping habit of 
the long and slender spikes is also very peculiar and, as far as I know, does not occur 
in any other Elsholtzia. 
PLECTRANTHUS L’Hérit. 
Plectranthus discolor Dunn in Not. Bot. Gard. Edinburgh, VIII. 155 
(1913); VI. 140 (1915). 
Western Szech’uan: valley of Hsao-chin Ho, near Romi-chango, 
alt. 2100-2700 m., June 1908 (No. 3529; shrub 1-1.3 m., flowers lav- 
ender); Min River valley, alt. 1200-2700 m., August 1903 (Veitch 
Exped. No. 4322; shrub 0.3-1.m., flowers blue); without precise 
locality, alt. 1200 m., July 1903 (Veitch Exped. No. 4321; 0.6 m., 
flowers blue). Kansu: without precise locality, W. Purdom (No. 
804***, seeds only; plants growing in the Arnold Arboretum). 
Here may be added a note on another species not collected during the Arnold 
Arboretum Expeditions. 
P. leucophyllus Dunn in Not. Bot. Gard. Edinburgh, VIII. 157 (1913); VI. 
ro E Western Szech'uan: Tung River valley, alt. 1200 m., July 1903 
eitch Exped. No. 4319; shrub 1.3 m., flowers light purple). do. 
This species is closely related to the preceding species, but is easily distinguished 
by its rugose leaves. 
