Rydberg : Further Studies on the Potentilleae 179 



P. inacuhita. The Greenland plant cited by Lange agrees fully 

 with the typical P. viacnlata except that the leaflets are broader, 

 more round and overlapping each other by the margins. I 

 scarcely think that it deserves a varietal name. If it does it must 

 bear some other name than finna, as this is preoccupied. The 

 specimens cited by Lange and the only one seen is the following: 

 Greenland : Holsteinsborg, 1884, Eug. Warming & TJi. Holm. 



Potentilla Langeana sp. nov. 



P. maadata ^ hirta Lange, Consp. Fl. Groenl. 6. 1880. Not 

 P. hirta L. 



A cespitose perennial. Stems erect or ascending, 2-3 dm. 

 high, sparingly hirsute with erect branches : basal leaves digitately 

 5-foliolate : stipules large, adnate, lanceolate, 1-2 cm. long : 

 petioles 3-8 cm. long, sparingly hirsute : leaflets cuneate-obovate, 

 more or less densely silky-hirsute on both sides, 1-3 cm. long, 

 coarsely toothed above the middle w^ith oblong ovate teeth, the 

 cuneate base entire : lower stem leaves similar but smaller and 

 short -petioled : upper stem-leaves ternate or simple and subsessile : 

 stipules ovate, acutish, about i cm. long : cyme 3-7-flowered ; 

 hypanthium silky hirsute : bractlets oblong to lanceolate, acute or 

 obtuse, about one fourth shorter than the lanceolate sepals : petals 

 broadly obcordate, 7-8 mm. long : stamens about 20. 



The species differs from P. maciilata not only in the characters 

 given by Lange, the several-flowered cymes and the long pu- 

 bescence of the leaves ; but also in the more acute teeth, the longer 

 and more acutish bractlets and narrower sepals. In P. maadata 

 both the teeth of the leaves and the bractlets are rounded at the 

 apex and the latter are only one half or two thirds as long as the 

 sepals. P. Langeana is in reality nearer related to P. verna than 

 to P. maadata but distinguished from that by the pubescence. In 

 Conspectus Florae Groenlandicae several more specimens are cited 

 belonging to P. maadata ^ hirta Lange. The following are the 

 only ones seen by me : 



Greenland: Amarahk Fjord, 183 i,/. rW//(type) ; Kangerd- 

 luarsuk Fjord, 1884, Warming & Hohii ; Natsilik, 5. Hanson; 

 Ekalunguit Itivnerit on Disco, 1898, Morten Pedersen, ^ig ; 

 Ekigtok in Disco Fjord, 168^ (a taller and more glabrate form*) ; 



■^ This was labeled /". w«rr«/rt/'<z var. /j)/r^;w?Va (Ramond) Lehm. , which is quite 

 a different plant, having thick leaves with short teeth directed forward. 



