Rvdberg : Rocky Mountain flora 635 



wide below, about 2 mm. at the throat ; lobes oblong-spatulate, 

 acutish ; capsule about 5 mm. long, acute. 



This has been mistaken for G. Haydeni, but that species is a 

 much more slender plant with shorter calyx, scarcely scarious- 

 margined lobes, minute subulate stem-leaves and shorter (3.5 mm. 

 long) obtuse capsule. It is more closely related to G. subnuda, 

 but differs in the branched stems and the finer and sparser pube- 

 scence. It grows in dry soil, especially on "sage-plains," at an 

 altitude of 1900-2 100 m. 



Colorado: Durango, 1898, Crandall 2053 (type) and 2040; 

 also 1896, Tweedy 448 ; Mancos, 1898, Baker, Earle & Tracy 

 404; also 1 90 1, Vreeland 88 j. 



Polemonium robustum sp. nov. 



Perennial with a woody caudex ; stem 4-10 dm. high, more 

 or less short-villous and above glandular; leaves 6-10 cm. long, 

 glandular-pubescent; leaflets 1 1- 17, lanceolate or lance-oblong, 

 acute, 1.5-2.5 cm. long ; the upper confluent and decurrent on the 

 rachis ; inflorescence much branched and corymbiform, but the main 

 axis usually overtopping the branches ; calyx glandular-villous, 

 y-S mm. long; lobes lanceolate; corolla rose or purplish, 12-15 

 mm. hieh ; lobes rounded and obtuse. 



This species is a close relative to P. foliosissiminu, but differs 

 in the large flowers and the more conical or obovoid inflorescence. 

 It grows in the mountains of Colorado, especially along streams, 

 at an altitude of 2400-3000 m. 



Colorado: Bob Creek, La Plata Mountains, 1898, Baker, 

 Earle & Tracy 274 (type) ; Keblar Pass, 1901, Baker 796 ; Clear 

 Creek Canon, 1885, Patterson 104; Sangre de Cristo Creek, 

 1900, Rvdberg & Vreelaiid 5718 ; Veta Pass, 1900, Rydberg & 

 Vreelaiid j j 17. 



Polemonium Grayanum sp. nov. 



Perennial with a cespitose rootstock ; stems about I dm. high, 

 glandular-villous ; leaves 3-5 cm. long, glandular-villous ; leaflets 

 at least of the basal leaves more or less verticillate, obovate or 

 spatulate, 2-6 mm. long, obtuse ; calyx about 18 mm. long, villous 

 with white hairs ; lobes linear-lanceolate ; corolla about 2 cm. 

 long, campanulate-funnelform with a wide tube ; lobes rounded. 



This species is nearest related to P. viscosum Nutt, but is char- 

 acterized by the long white hairs on the calyx. It grows on the 



