276 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
Flowers early June. Hardy. 
Habitat.— Western and central North America. 
Occurs in two forms : (i) the typical form with very short, tufted, 
barren stems and flower stems 4 or 5 inches long ; and (2) with 
Fig. 161. — 5. sienopetalum Pursh. 
elongate, procumbent stems, barren shoots up to 6 inches long, flower- 
shoots up to 12 inches long, procumbent below, erect above ; whole 
plant more vigorous, sometimes suffused with dark purplish red. 
S. stenopetalum is rather rare in cultivation, but generally correctly 
named. Collected specimens from British Columbia and Colorado, 
and many others from gardens in England, Geneva, Lindau, Petrograd, 
and New York, belong to the typical form. The diffuse form I have 
