Rydberg: Studies on the Rocky Mountain Flora 282 



linear-lanceolate or of the upper leaves filiform, acute or attenuate : 

 flowers light yellow : petals scarcely exceeding the sepals : pedicels 

 very short in flower ; in fruit 4-6 mm. long, ascending or almost 

 erect : pods 8—10 mm. long, erect, more or less curved, especially 

 those of the branches, scarcely exceeding 7 mm. in.width, more or 

 less constricted between the seeds ; beak slender, short, about .5 

 mm. long : seeds uniserial, red, a little over i mm. long. 



This species has the short pedicels and erect pods of 5. Hart- 

 ivcgiana, but the pod of the latter is more slender, and often 

 curved, the whole plant is greener and conspicuously glandular, 

 and the segments of the leaves are more slender. The latter char- 

 acter and the short ascending or erect pedicels distinguish it from 

 6". iiicisa Engelm. It grows at an altitude of 1000-1500 m. 



Wyoming : Rolling plains between Sheridan and Buffalo, 1900, 

 F. Tweedj', jjp-- 



Sedum frigidum sp. nov. 



Perennial with a fleshy rootstock, dioecious. Stems usually 

 less than i dm. high, light green : leaves flat, 1-1.5 cm. long and 

 5—7 mm. wide, sessile, obovate or oblong-obovate, often dentate 

 above the middle, or entire, acute : inflorescence dense, usually dark 

 purple : flowers 4-5-merous, usually 5-merous : sepals of the 

 staminate flowers lanceolate, acute, 1.5-2 mm. long, dark purple or 

 rarely greenish : petals oblanceolate or oblong, acute, about 3 mm. 

 long, dark purple or very rarely greenish tinged with purple : fila- 

 ments filiform, purple, about one third longer than the petals, the 

 pistillate similar but with somewhat shorter and more obtuse petals : 

 follicles 3—5 mm. long, oblong, with a very short beak about .5 

 mm. long, divergent or at last recurved. 



This species has gone under the name of 6". roscuvi (L.) Scop., 

 but is quite unlike the northern European plant, which must be re- 

 garded as the type of RJiodiola rosea L. This has a very short, 

 almost tuberous rootstock, more oblanceolate leaves about 3 cm. 

 long, usually with very sharp dentations, usually yellow petals, 

 longer filaments almost twice as long as the petals and follicles, 6- 

 8 mm. long. This form is also found in the mountains of southern 

 Europe ; but there seems to be another European plant ; this is de- 

 scribed and figured under the name RJiodiola rosea in the " Flora von 

 Deutschland" published by Schlechtendal, Langethal and Schenk. 

 It resembles more the Rocky Mountain plant in the purple, 

 flowers and short stamens, but it has more inversely deltoid leaves, 



