VASCULAR PLANTS OF NORTH DAKOTA 417 
Potentilla pennsylvanica Hippiana T. & G. FI. N. A. I: 438. 
(1849). 
Butte, Sheyenne. 
Pentiphyllum is a good genus name for the species here 
numbered 551-553. For the following (numbered 554-561) it 
is just as fitting as Chrysanthermum is for those of its species having 
white rays! 
POTENTILEA, Bruntels in C? Bauhin’-Pinax.: 221. (1623). 
Matthioli, Fuchsius Hist: and Stirp. (1546), Stirp. Hist. 355. 
(1549), Caesalpinus, De Plantis 557. (1558). 
562. Potentilla Anserina Linn: Sp. Pl. 495. (1753). 
Argentina vulgaris Lam., Fl. Fr. 3. (1778). 
Leeds. 
563. Potentilla Anserina concolor Rydb. Mem. Bot. Col. 
Coll. 2: 160. (1898). 
Argentian argentea Rydb. Bull. Torr. Club. 33: 143. (1906), 
seems to possess a different, more permanently and deeply silvery 
dressing, covering all the leaves. In our plant it often happens 
that some of the leaves are green above, or merely in part silvery. 
Leeds: 
564. Potentilla Anserina grandis T. & G. 
Leeds, Butte. 
PREDOPRAY LELUM | Necker \HIs¢2:.93. (1790): 
565. Tridophyllum monspeliense (Linn.) Greene, Leaflets 
I: 189. (1906). 
Potentilla monspeliensis Linn. Sp. Pl. 499. (1753). 
Leeds, Butte, Towner. 
566. Tridophyllum pentandrum (Engelm.) Greene, |. c. 
Potentilla pentandra Engelm.; T. & G. Fl. N. A. T: 447. (1840). 
Potentilla rivalis var. pentandra S. Wats. Proc. Am. Acad. 
8: 553. (1873). 
Leeds, Butte, Bottineau. 
567. Tridophyllum leucocarpum (Rydb.) Greene. 1. c. 
Potentilla leucocarpa Rydb. in Britt. Il. Fl. U. S. and Canada, 
Wok ld s-2n2)-( 1857), 
Potentilla milligrana Engelm.; Iehm. Delect. Sem. Hort. 
Hamb. 1849. Add. 12. (1849). Not Dougl. 1833. 
Potentilla rivalis var. milligrana S. Wats. Proc. Am. Acad. 
Bs as ele 76h 
Leeds, Butte. 
