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MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
Potentilla recta obscura Koch, Syn. Fl. Germ. & Helv. 213.’ 
Tall and strict, generally over 5 dm. high, sparingly hirsute, the long hairs often intermixed 
with a finer pubescence. Leaves dark green, very strongly veined, digitate, with 5-8 broadly oblanceo- 
late leaflets, which are cut more than half-way to the midrib into lanceolate-triangular divergent 
teeth. Cyme branched, many-flowered. Sepals and bractlets subequal, lanceolate, almost equalling 
the bright and rather dark yellow petals. Stamens about 30. Pistils numerous. 
The true P. recta is very rare in America, and I doubt if it ever has established itself. A few 
specimens are found in our herbaria, but they are almost all from cultivated specimens. One of these 
was from seeds collected by J. Blake, at York, Maine. What has gone under the name P. recta in 
this country is mostly the next species. 
52. Potentilla sulphurea Lam. 
Potentilla sulphurea Lam. Fl. Fr. 8: 114. 1778. 
Potentilla pallens Moench, Meth. 658. 1794. 
Potentilla recta Willd. Sp. Pl. 2: 1099. 1800. Not L. 1758. 
Persoon, Syn. Pl. 2: 54; Nestler, Mon. Pot. 25 and 42; Haller, Syn. Pot. 90; 
Lehm. Mon. Pot. 79; Sprengel, Syst. Veg. 2: 536; Don, Gard. Dict. 2: 555; Dietr. 
Syn. Pl. 3: 184; Ledeb. Fl. Ross. 2: 45. 
Fat. Man. Ed. 2: 379: Ed. 3: 408; Ed. 5: 344; Hd.-6: 281; Hd. 7: 457; Hat -& 
Wr. N. Am. Bot. 373; Wood, Class Book, 343; A. Brown, in Bull. Torr. Bot. Club, 7: 
124: Wibbe, ibid. 10: 47; Hill, ibid. 21: 79; Wats. & Coult. in Gray, Man. Ed. 6: 735°; 
3ailey, in Gray, F. F. & G. Bot. Rev. Ed. 151; Rydb. Bull. Torr. Bot. Club, 24: 9; 
Britt. & Brown, Ill. Fl. 2: 210. 
Potentilla recta sulphurea La Peyr. Hist. Abr. Pl. Pyr. 288. 1813. 
Potentilla pallida Lagase.; Besser, Enum. Pl. Volh. 69. 1822. 
Potentilla hirta recta Ser. in DC. Prod. 2: 579. 1825. 
Potentilla crassa Tausch.; Opiz, Boeheims Gey. 63 (fide Lehmann). 
Potentilla intermedia Roth, Tent. Fl. Germ. 1: 223 (fide Lehmann). Not L. 
Potentilla acutifolia Gilib. Suppl. Plant. Eur. 564 (fide Lehm.). 
Potentilla erecta Lehm. Mon. 23, 1820 (misprint?); Upenski ; Ledeb. FI. Ross. 2: 45. 
Potentilla recta pallida Lehm. Rey. Pot. 83. 1856. Walp. Ann. 2: 486. 
Inuusrrations : Dietr. Fl. Boruss. 4: pl. 238 *; Nestler. Mon. p/. 6; Sturm, Deutschl. 
Fl. 91: pl. 4*; Reichenb. Icon. Bot. Cent. 4: pl. 339, f. 520*; Britt. & Brown, Ml. Fl. 2. 
f. 1917. PATE 27, f. 1; dissection of flower, f. 2; pistil, f 3; stamen, jf. 4; fruiting hy- 
panthium and calyx, f. 5. 
Stems tall, 4-7 dm. high, strict and leafy, branched above, finely pubescent and with 
1 Most references are here omitted. 
