Rydberg: Studies on the Rocky Mountain flora 477 



in the subspecies delicatum, the stem is pubescent with long white 

 spreading hairs and the leaflets are decidedly acute, while in the 

 forms included in the subspecies parvifolium, the stem is merely 

 puberulent and the leaflets usually obtuse. 



The specimens cited under the subspecies delicatum belong to 

 three or four different species. Those from Colorado and Utah 

 belong to P. scopidinum Greene and P. delicatum Rydb., which 

 perhaps may not be specifically distinct. Those from California 

 belong to P. californicum Eastw. Those from Washington and 

 perhaps those from Oregon to an undescribed species, characterized 

 below. 



The subspecies parvifolium was divided in var. a Haydenii and 

 var. /3 pilosum (= P. pilosum Greenman). It is very hard to 

 interpret Dr. Brand's arrangement. He gives under the sub- 

 species parvifolium the following synonyms: P. parvifolium Nutt.; 

 P. coerideum J. Hook.; P. mexicanum Nutt.; P. viscosum A. Gray, 

 not Nutt., but cited no specimens. His usage as well as that of 

 most European botanists is to designate the typical form by var. 

 a. Hence var. a Haydenii is the typical form of subsp. parvifolium, 

 and still under this he has the following synonyms: P. Haydeni 

 A. Nels., P. montrosense A. Nels., and P. Tevisii Eastw. P. parvi- 

 folium Nutt. is the same as P. mexicanum Nutt. and P. viscosum 

 A. Gray, and is characterized by its small dense inflorescence and 

 its obtuse calyx-lobes, or the latter even rounded at the apex; 

 but it is not the same as P. coeruleum y Hook., or P. Haydeni A. 

 Nels., or P. Tevisii Eastw. 



Polemonium coerideum y Hook, is the original P. pulcherrimum 

 Hook., and this should have been made subsp. A var a, according 

 to Brand's system. P. Haydeni resembles it closely in flowers, 

 leaves and pubescence, but differs considerably in general habit 

 and the inflorescence. 



Polemonium columbianum Rydb. sp. nov. 



Perennial, with a branched rootstock and caudex; stems several, 

 2-3 dm. high, viscid-pubescent with flattened hairs, and distinctly 

 glandular in the inflorescence; leaves 5-15 cm. long, likewise 

 sparingly viscid-pubescent, pinnate; leaflets 9-19, elliptic or 

 lance-elliptic, acute, 1.5-3 cm. long; inflorescence corymbiform- 

 paniculate; calyx about 6 mm. long, glandular-puberulent and 



